TAWS 8000 FAQs
I have a Collins Proline 21 equipped aircraft and I am interested in the TAWS8000. What do I need to watch out for?
The Collins Proline 21 has two versions of configuration modules! To make the Proline compatible for display, the system must be configured to a –201 for the IAPS, the other configurations -200 are NON-TAWS aware. If your system is a –200, it can be modified to a –201. Check with Rockwell Collins for price and availability.
I have an older King Air with Collins II EFIS 85 system. What do I need to display TAWS?
Two things to investigate!
First, the ADC. Verify that the ADC is compatible (see Appendix C of the Installation Manual). Some of the King Air series used an ADC80N, which is not compatible as is. There are two ways to resolve this. First would be to comply with Rockwell Collins SB26 or use a Skylite Manchester bus adapter. Second, verify if the Radar system has an Arinc453 output. If the radar system is a WX-8xx system it is 453 compatible. If it does not, then a Collins WXA1000 adapter will be required if a TAWS display is desired. Check with Rockwell Collins for price and availability.
Upon testing the TAWS system, I am getting a MSL failure callout. What does this mean?
Several things may be missing (altitude information, GPS information, etc.). Verify the external sensor inputs, and that the correct labels are being transmitted to the TAWS unit. Verify that the GPS is valid. Check for any other invalid or missing labels.
I am transmitting GAMA 429 GPS information to the TAWS. Do I need a separate RAIM integrity input?
If you are using GAMA, label 261 (RAIM) will be present, therefore no external RAIM flag input is necessary. However, if you are not using GAMA, you will need a RAIM flag from the GPS system.
How do I use the flap input?
The optional flap input is used to indicate that the aircraft is no longer in a cruise condition. We offer different input connections to accomplish this. The input can be an open, ground, or a voltage. This is programmable in the set up procedures during initial installation using the laptop computer.
How does LandMark TAWS8000 use the database?
The TAWS8000 is a terrain awareness and warning system that has predictive look ahead capability. It uses GPS position and velocities along with aircraft altimetry to predict future aircraft 3D position. This position is compared against the terrain elevation database to predict potential ground impact. In a similar fashion, the TAWS looks into the database for conflicts with obstacles. It also looks at runways to prevent nuisance alerts when landing.
What information is contained in the TAWS database?
The TAWS8000 database includes terrain, obstacle, runway databases and magnetic variation information. Using this data, the TAWS8000 displays unique symbols for obstacles, graphical depictions of runways (more than 2000 feet long) and an enhanced terrain depiction using seven shades of color for superior contouring effects.
Jeppesen provides terrain and NavData runway information. The FAA provides obstacle information. NOAA provides magnetic variation tables.
I have everything connected to the TAWS as indicated in the installation manual, but the system is not passing the test, nor is there any display.
Verify the setup and save the configuration via the laptop. All inputs and outputs are configurable for various systems, and they must be configured correctly to allow the TAWS to function.
Am I required to have annunciators and switches?
Yes. The required annunciation is as follows:
PULL UP (red text, warning) TERR (amber text, caution) TERR NOT AVAIL (for any failure or lack of sensor that disables the alerts) TERR INH (switch/annunciation to disable TAWS functions) TERR TEST (switch required, but the lamp is optional) TERR DISP (only required when an ARINC 453 display is installed)
Are there optional annunciators / switches?
Yes. They are as follows.
The TAWS8000 is giving a sensor fail condition but when I look at the data monitor everything is valid. What is wrong?
During power up of the TAWS via the laptop, look at the first power up sequence. If the phrase: PU, GEOMAG, or WMM is displayed, the data card is defective and must be replaced.
Arinc429 TAWS Setup (display options)
Collins Proline 21
Collins Proline IV / Proline II
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TAWS 8100 FAQs
Can I use an existing GPS antenna with the TAWS 8100?
The Freeflight GPS antenna (p/n 81194) is the only antenna that was certified with the TAWS 8100. Therefore you must install this antenna.
Can I use a GPS antenna coax splitter with the TAWS 8100?
No. A coax splitter would create too much loss and deteriorate the WAAS/GPS signal.
Does the Freeflight WAAS/GPS retain its last known position and almanac data?
Yes, the GPS saves its last known good position in non-volatile memory as well as the last almanac. TheTAWS8100 makes use of this feature by immediately on power-up starting to unpack terrain data for the last known lat/long even before the position is marked valid. The position can be marked valid as quickly as about 90 seconds which causes the TAWS to then become valid and immediately have display of terrain available.
Is there a separate charge for the Freeflight WAAS/GPS?
No. The TAWS 8100 list price includes the TAWS 8100 computer, Freeflight WAAS/GPS receiver, Freeflight GPS antenna, TAWS 8100 installation kit, and GPS installation kit. The GPS installation kit includes one right angle TNC coax connector and one straight TNC coax connector, as well as the required components for the 25 pin D-sub connector.
What type of coax cable can I use for the GPS antenna?
RG-142 or RG-400 can be used if the antenna cable is 30 feet or less. For antenna cables longer than 30 feet, a lower-loss cable should be used.
When do I need to connect a heading input to the TAWS8100?
You only need heading if a display if going to be used. The TAWS8100 can accept either synchro heading or Arinc 429 (Label 320) heading.
I have a Collins Proline 21 equipped aircraft and I am interested in the TAWS8100. What do I need to watch out for?
The Collins Proline 21 has two versions of configuration modules! To make the Proline compatible for display, the system must be configured to a –201 for the IAPS, the other configurations -200 are NON-TAWS aware. If your system is a –200, it can be modified to a –201. Check with Rockwell Collins for price and availability.
I have an older King Air with Collins II EFIS 85 system. What do I need to display TAWS?
Verify if the Radar system has an Arinc453 output. If the radar system is a WX-8xx system it is 453 compatible. If it does not, then a Collins WXA1000 adapter will be required if a TAWS display is desired. Check with Rockwell Collins for price and availability.
Upon testing the TAWS system, I am getting a MSL failure callout. What does this mean?
Several things may be missing (altitude information, GPS information, etc.). Verify the external sensor inputs, and that the correct labels are being transmitted to the TAWS unit. Verify that the GPS is valid. Check for any other invalid or missing labels.
I am transmitting GAMA 429 GPS information to the TAWS. Do I need a separate RAIM integrity input?
If you are using GAMA, label 261 (RAIM) will be present, therefore no external RAIM flag input is necessary. However, if you are not using GAMA, you will need a RAIM flag from the GPS system.
How does LandMark TAWS8100 use the database?
The TAWS8100 is a terrain awareness and warning system that has predictive look ahead capability. It uses GPS position and velocities along with aircraft altimetry to predict future aircraft 3D position. This position is compared against the terrain elevation database to predict potential ground impact. In a similar fashion, the TAWS looks into the database for conflicts with obstacles. It also looks at runways to prevent nuisance alerts when landing.
What information is contained in the TAWS database?
The TAWS8100 database includes terrain, obstacle, runway databases and magnetic variation information. Using this data, the TAWS8100 displays unique symbols for obstacles, graphical depictions of runways (more than 2000 feet long) and an enhanced terrain depiction using seven shades of color for superior contouring effects.
Jeppesen provides terrain and NavData runway information. The FAA provides obstacle information. NOAA provides magnetic variation tables.
I have everything connected to the TAWS as indicated in the installation manual, but the system is not passing the test, nor is there any display.
Verify the setup and save the configuration via the laptop. All inputs and outputs are configurable for various systems, and they must be configured correctly to allow the TAWS to function.
Am I required to have annunciators and switches?
Yes. The required annunciation is as follows:
PULL UP (red text, warning) TERR (amber text, caution) TERR NOT AVAIL (for any failure or lack of sensor that disables the alerts) TERR INH (switch/annunciation to disable TAWS functions) TERR TEST (switch required, but the lamp is optional) TERR DISP (only required when an ARINC 453 display is installed)
Are there optional annunciators / switches?
Yes. They are as follows:
The TAWS8100 is giving a sensor fail condition but when I look at the data monitor everything is valid. What is wrong?
During power up of the TAWS via the laptop, look at the first power up sequence. If the phrase: PU, GEOMAG, or WMM is displayed, the data card is defective and must be replaced.
Arinc429 TAWS Setup (display options)
Collins Proline 21
- Left/Right Side Range Control
Collins Proline IV / Proline II i-linc / MX-20
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Skywatch 497 FAQs
Why do I get an Error 30 when I turn on the Sky 497?
This means that the TRC497 configuration settings have changed since the last power cycle. If the TRC497 is being re-installed after service at the factory, or is a new installation, the configuration straps in the aircraft connector must be saved to the software of the TRC497. There are two ways to accomplish this:
If no alternate display is used, then the ‘Service Menu’ will be accessible through the WX-1000 display. Enter the Service Menu by pressing the left two Softkeys while turning power on. Select the ‘System Data’ option. Select the ‘Configuration’ option. On the Configuration Page, verify the configuration data is correct and select ‘Save’ by pressing Softkey 4. If ‘Save’ is not available, then the configuration data has been previously saved. Select ‘Next’ to advance to the next page. Verify and ‘Save’ the data. Repeat these steps for all four Configuration pages. If an alternate display is used, then a laptop computer or PC must be used. Using the computer, establish communication with the TRC497 (for help, see Communicating with the Skywatch Processor). Type the command: config Verify that the configuration data is correct. Type the command: save After the TRC497 saves the configuration settings, you should see a message that verifies the configuration straps were saved.
Why do I get an error 18 when I select ‘Operate’ mode on my Sky497?
This means that the TRC497 needs to be calibrated. A calibration needs to be accomplished after a new installation, after the TRC497 has been serviced at the factory, or anytime the RF antenna cables have been removed and reinstalled on the antenna or processor. There are two ways to accomplish this:
If no alternate display is used, then the ‘Service Menu’ will be accessible through the WX-1000 display. Enter the Service Menu by pressing the left two Softkeys while turning power on. Select the ‘Configuration’ option. Select ‘Yes’ to re-calibrate the system. When the calibration is complete, you will see a message that says “Re-calibration Successful”. You will also see an old calibration value and a new calibration value. These values may be important for troubleshooting certain RF related problems. If an alternate display is used, then a laptop computer or PC must be used. Using the computer, establish communication with the TRC497 (for help, see Communicating with the Skywatch Processor). Type the command: cal You will see a message that says “Starting Calibration. Please Wait…” When the calibration is complete, you will see a message that says “Re-calibration Successful.” You will also see an old calibration value and a new calibration value. These values may be important for troubleshooting certain RF related problems.
I’ve just added an MFD in the aircraft. Can I display the Sky497 on the MFD and the WX-1000 display at the same time?
Yes. Two things to keep in mind though:
You will most likely want to keep the Softkey control lines connected to the WX-1000 display to ensure that you will have full control capability of the WX-1000 Processor (if one is installed). You will need to install a ground strap to P1-80 of the Skywatch connector. This will enable the Arinc429 output of the TRC497. Once you install the ground strap, the TRC497 will show an error 30 until the new configuration is saved (see Error 30 above). Now that you are using an alternate display, you must use a laptop computer or PC to accomplish the configuration save.
During ‘Operate’ mode, why do I see a Traffic Advisory in the center of the display at 00 altitude?
This means that one of the aircraft transponders is replying to the interrogations that are being transmitted by the Skywatch system. The transponders, DME’s, and Skywatch should all be connected to the mutual suppression bus to prevent this from happening. The aircraft wiring needs to be troubleshot to determine where the problem is.
Why do I get a ‘Data Fail’ message on my MFD.
This means that the MFD is not receiving any Arinc429 data from the TRC497. There will be no error logged in the TRC497 during this condition. The aircraft wiring should be troubleshot to verify the Arinc429 connection between the TRC497 and the display and to verify that P1-80 is grounded at the TRC497.
Why does my Sky497 come up in ‘Operate’ mode and I cannot switch the TRC to ‘Standby’ mode?
This is caused by an incorrect Weight-On-Wheels input. The TRC497 needs to see a ground on P1-88 when the aircraft is on the ground. When P1-88 is not grounded, the TRC497 thinks the aircraft is in the air, so it will only use ‘Operate’ mode and the manual ‘Standby’ mode selection is disabled.
Why can’t I hear any Traffic Advisory audio call-outs?
Three things can cause this:
Incorrect audio interface wiring. The TRC497 sends the audio call-outs to the aircraft audio amplifier on an unswitched, unmuted input. Verify the aircraft wiring is correct. In this situation, the TRC497 Self-Test Audio will also not be heard. The TRC497 Audio Output is being suppressed. When the TRC497 sees a ground on P1-32, no audio will be output. This ground should only be sent by a Terrain Awareness and Warning System when that system is sending out a Terrain Warning call-out. This symptom is normal operation when P1-87 is grounded. This is the Gear input that indicates the aircraft gear is down and locked, therefore during flight, the aircraft would be in the approach phase and all audio call-outs are muted during this phase of flight.
Can I adjust the Audio Volume of the TRC497 system?
There is no internal adjustment for volume in the TRC497. However, there are ways to adjust the volume using a specific size resistor or a potentiometer. This should only be accomplished by qualified and trained personnel. Consult your local L-3 Avionics Systems Authorized Dealer or an L-3 Avionics Systems Field Service Engineer for further information.
Why do I only see targets that are above my altitude?
This can be caused by an incorrect Radio altitude input. When the Radio Altitude input indicates 1700 feet AGL or less, the Skywatch enters a ‘Ground Filtering’ mode. All targets that are 400 feet AGL and less are not displayed. If the Radio Altimeter input is always indicating 0 feet AGL, all targets 400 feet above your altitude and lower will not be displayed. The Radio Altimeter interface wiring and the Radio Altimeter output need to be verified.
Why do I see ‘Ghost’ or ‘Phantom’ target?
This is usually caused by RF interference from another antenna or obstruction near the Skywatch antenna. The Skywatch antenna should be installed in an area of the fuselage that does not have any interference and should maintain approximately 24 inches of separation from all other antennas and 36 inches of separation from other L-band antennas.
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Skywatch 899 FAQs
Why do I get an error 15 when I select ‘Operate’ mode on my Sky899?
This means that the TRC497 needs to be calibrated. A calibration needs to be accomplished after a new installation, after the TRC497 has been serviced at the factory, or anytime the RF antenna cables have been removed and reinstalled on the antenna or processor. There are two ways to accomplish this:
If no alternate display is used, then the ‘Service Menu’ will be accessible through the WX-1000 display. Enter the Service Menu by pressing the left two Softkeys while turning power on. Select the ‘Configuration’ option. Select ‘Yes’ to re-calibrate the system. When the calibration is complete, you will see a message that says “Re-calibration Successful.” You will also see an old calibration value and a new calibration value. These values may be important for troubleshooting certain RF related problems. If an alternate display is used, then a laptop computer or PC must be used. For help, see Communicating with the Skywatch Processor.
I’ve just added an MFD in the aircraft. Can I display the Sky899 on the MFD and the WX-1000 display at the same time?
Yes. Two things to keep in mind though:
You will most likely want to keep the Softkey control lines connected to the WX-1000 display to ensure that you will have full control capability of the WX-1000 Processor (if one is installed). You will need to configure the Sky899 for a display output. This will enable the Arinc429 output of the TRC899. This can only be accomplished using a laptop computer or PC. (for help, see Communicating with the Skywatch Processor)
During ‘Operate’ mode, why do I see a Traffic Advisory in the center of the display at 00 altitude?
This means that one of the aircraft transponders is replying to the interrogations that are being transmitted by the Skywatch system. The transponders, DME’s, and Skywatch should all be connected to the mutual suppression bus to prevent this from happening. The aircraft wiring needs to be troubleshot to determine where the problem is.
Why do I get a ‘Data Fail’ message on my MFD.
This means that the MFD is not receiving any Arinc429 data from the TRC899. There will be no error logged in the TRC899 during this condition. The aircraft wiring should be troubleshot to verify the Arinc429 connection between the TRC899 and the display.
Why does my Sky899 come up in ‘Operate’ mode and I cannot switch the TRC to ‘Standby’ mode?
This is caused by an incorrect Weight-On-Wheels input. The TRC899 needs to see a ground or a voltage (configurable) on P1-24 when the aircraft is on the ground. When P1-24 is not grounded, the TRC899 thinks the aircraft is in the air, so it will only use ‘Operate’ mode and the manual ‘Standby’ mode selection is disabled.
Why can’t I hear any Traffic Advisory audio call-outs?
Three things can cause this:
Incorrect audio interface wiring. The TRC899 sends the audio call-outs to the aircraft audio amplifier on an unswitched, unmuted input. Verify the aircraft wiring is correct. In this situation, the TRC899 Self-Test Audio will also not be heard. The TRC899 Audio output is being suppressed. When the TRC899 sees a ground on P1-34, no audio will be output. This ground should only be sent by a Terrain Awareness and Warning System when that system is sending out a Terrain Warning call-out. This symptom is normal operation when P1-33 is grounded. This is the Gear input that indicates the aircraft gear is down and locked, therefore during flight, the aircraft would be in the approach phase and all audio call-outs are muted during this phase of flight.
Can I adjust the Audio Volume of the TRC899 system?
Yes. The audio volume can be changed in the Service Menu using a laptop computer or PC. (for help, see Communicating with the Skywatch Processor)
Why do I only see targets that are above my altitude?
This can be caused by an incorrect Radio Altitude input. When the Radio Altitude input indicates 1700 feet AGL or less, the Skywatch enters a ‘Ground Filtering’ mode. All targets that are 400 feet AGL and less are not displayed. If the Radio Altimeter input is always indicating 0 feet AGL, all targets 400 feet above your altitude and lower will not be displayed. The Radio Altimeter interface wiring and the Radio Altimeter output need to be verified.
Why do I see ‘Ghost’ or ‘Phantom’ target?
This is usually caused by RF interference from another antenna or obstruction near the Skywatch antenna. The Skywatch antenna should be installed in an area of the fuselage that does not have any interference and should maintain approximately 24 inches of separation from all other antennas and 36 inches of separation from other L-band antennas.
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Stormscope FAQs (all models)
What are the differences between the models?
The series I Stormscope systems are the WX-7, WX-8, WX-9, WX-10, WX-11 and WX-12 models. The WX-7 system is no longer supported. The WX-8 and above are all supported by our Service, Repair and Overhaul facility located in Grand Rapids, Michigan. The WX-8 has a display/processor unit, while the WX-9, WX-10 and WX-11 have remote processors and a display unit. All Series I Stormscopes use the same antenna. Originally, the antenna used two connectors, however, new replacement antennas will only have a single connector.
The Series II Stormscopes are the WX-1000, WX-900, WX-950 and WX-500 models. All of the Series II Stormscopes are supported by our Service, Repair and Overhaul facility located in Grand Rapids, Michigan. The WX-1000 consists of a remote processor, a display and an antenna. The WX-900 and WX-950 have a display/processor unit and an antenna. The WX-500 is only a remote processor and an antenna, and must be interfaced with a compatible Multi-Function Display (MFD). The WX-500 and WX-950 have a ‘Cell’ mode and a ‘Strike’ mode while the WX-1000 and WX-900 do not.
How is the antenna bonded?
The antenna is plastic and is covered with a black conductive coating, which is then covered with white paint. The black area around the antenna mount screw holes is the conductive coating and needs to be bonded to the airframe through the washers and mounting screws to the doubler plate, which should be bonded to the airframe ground.
Why don’t I see any lightning strikes on my Stormscope when ATC is telling me I have a Level 3 storm ahead?
The radar that ATC is using shows water content and not lightning. The Stormscope will only show the electrical activity, so both can be accurate. Keep in mind that in the anatomy of a thunderstorm, you can have lightning (and the associated convective activity) before there is the formation of clouds, and there can be a tremendous amount of rain after the electrical activity has stopped. For more details on this subject, experience Stormscope.net.
Where should the antenna be mounted?
The Stormscope is looking for lightning, which is intense discharges of static electricity, therefore, the location of the antenna is critical to ensure optimum performance. An L-3 Avionics Systems Authorized Dealer has specialized test equipment called a ‘skin-mapper’ which will help in locating the exact location for the antenna to be placed. This location could be critical by inches, so we require an Authorized Dealer to skin-map every installation.
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Series I Stormscope FAQs
Are new antennas available for my Series I Stormscope?
Yes. The part number for the new antenna is 78-8060-5860-4. This new antenna will have a single connector. If your existing antenna is a dual connector antenna, then your aircraft will need to be converted for a single connector configuration. Service Letter SL-151 will guide you through the conversion and provide you with information on additional parts that are required.
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WX-1000 FAQs
Why do I get an Error 44 and/or Error 45 on my WX-1000?
Once every ten seconds, the WX-1000 processor sends a ‘test strike’ to the antenna. The return strike must come back at the correct range and bearing. If the strike comes back, but in the wrong location, an Error 44 is generated. If the test strike does not get returned at all, an Error 45 is generated. Errors 44 and 45 can be caused by the WX-1000 Processor, the WX-1000 Antenna or a wiring problem with the antenna cable, but most of the time, aircraft noise is to blame.
Determine if the WX-1000 system is detecting noise interference using the following procedures:
On the WX-1000 Display, press and hold the two left-hand Softkeys as you turn the system on. This will enter the ‘Service Menu.’ Scroll down to the ‘Noise Tests’ option and select it. This will take you to the Noise Monitor Page. Turn all electrical systems in the aircraft ON including all interior and exterior lights. Select the DME’s and Transponders to ON. Look for any ‘False Strikes’ to appear on the display. If no ‘False Strikes’ are shown on the Noise Monitor Page, it may be necessary to run the aircraft engine(s) to verify that the alternators, magnetos, or igniters are not producing any interference. This should only be done by qualified personnel. If there is no noise detected from any aircraft electrical system, then the WX-1000 Processor and WX-1000 Antenna should be bench tested and/or serviced. If ‘False Strikes’ are shown, you will need to troubleshoot the aircraft to find the cause of the noise. Service Letter SL-148 and the Stormscope Noise Troubleshooting page will guide you through the troubleshooting procedures.
Why do I get False Storms on my WX-1000 Stormscope?
The WX-1000 is detecting noise from an electrical system in the aircraft. It may be helpful to isolate certain conditions in which the false storms appear, or determine which phase of operation the false storms appear. This can be done by observing the Stormscope operation and noting the following conditions.
Do the false storms appear during ground operations with the engine(s) off? Do the false storms appear whenever the engine is running? Do the false storms appear only during flight?
To further determine the cause of the false storms, see Service Letter SL-148 and the Stormscope Noise Troubleshooting page.
Why do I get an Error 3 on my WX-1000 Display?
The Installation Manual will indicate that this condition is caused by a dead clock battery. This battery is actually part of a battery backed RAM and is imbedded into an IC on a printed circuit board and therefore can only be replaced by an Authorized Stormscope Repair Facility.
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WX-900 FAQs
Why does my WX-900 show false storms?
The WX-900 is detecting noise from an electrical system in the aircraft. It may be helpful to isolate certain conditions in which the false storms appear, or determine which phase of operation the false storms appear. This can be done by observing the Stormscope operation and noting the following conditions.
Do the false storms appear during ground operations with the engine(s) off? Do the false storms appear whenever the engine is running? Do the false storms appear only during flight?
To further determine the cause of the false storms, see Service Letter SL-148 and the Stormscope Noise Troubleshooting page.
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WX-950 FAQs
Why do I get a ‘WX Fail’ message on my WX-950 Display?
‘WX Fail’ means the Stormscope is in a failed condition. The failure could be caused by an internal fault, or could be caused by an input to the WX-950 processor.
Why does my WX-950 show false storms?
The WX-950 is detecting noise from an electrical system in the aircraft. It may be helpful to isolate certain conditions in which the false storms appear, or determine which phase of operation the false storms appear. This can be done by observing the Stormscope operation and noting the following conditions.
Do the false storms appear during ground operations with the engine(s) off? Do the false storms appear whenever the engine is running? Do the false storms appear only during flight?
To further determine the cause of the false storms, see Service Letter SL-148 and the Stormscope Noise Troubleshooting page.
Why do I get an Error 17 and/or Error 18 on my WX-950?
Once every ten seconds, the WX-950 processor sends a ‘test strike’ to the antenna. The return strike must come back at the correct range and bearing. If the strike comes back, but in the wrong location, an Error 17 is generated. If the test strike does not get returned at all, an Error 18 is generated. Errors 17 and 18 can be caused by the WX-950 Processor, the WX-950 Antenna or a wiring problem with the antenna cable, but most of the time, aircraft noise is to blame.
Determine if the WX-950 system is detecting noise interference using the following procedures:
On the WX-950 Display, press and hold the two left-hand Softkeys as you turn the system on. This will enter the ‘Service Menu.’ Scroll down to the ‘Noise Tests’ option and select it. This will take you to the Noise Monitor Page. Turn all electrical systems in the aircraft ON including all interior and exterior lights. Select the DME’s and Transponders to ON. Look for any ‘False Strikes’ to appear on the display. If no ‘False Strikes’ are shown on the Noise Monitor Page, it may be necessary to run the aircraft engine(s) to verify that the alternators, magnetos, or igniters are not producing any interference. This should only be done by qualified personnel. If there is no noise detected from any aircraft electrical system, then the WX-950 Processor and WX-950 Antenna should be bench tested and/or serviced. If ‘False Strikes’ are shown, you will need to troubleshoot the aircraft to find the cause of the noise. Service Letter SL-148 and the Stormscope Noise Troubleshooting page will guide you through the troubleshooting procedures.
Can my WX-950 display information on my MFD?
No. The WX-950 is a ‘Stand Alone’ system. It does not have any output capability.
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WX-500 FAQs
How do I access the Service Menu for the WX-500?
The WX-500 was designed to be displayed on various Multi-Function Displays (MFDs). Therefore, the procedures on how to access the service menu will vary depending on the software of the MFD. Consult the applicable MFD Maintenance Manual or Aircraft Flight Manual for detailed procedures.
Can I use the RS-232 output and the RS-422 output at the same time?
Yes. The WX-500 can support up to 8 displays on the RS-422 and up to 3 displays on the RS-232 bus, but only one of the displays can transmit to the WX-500. This means that if you have an aircraft with the WX-500 being displayed on multiple displays, you must first determine which display will be transmitting to the WX-500 (the master). When a display transmits to the WX-500 via RS-232, the WX-500 will then transmit data on the RS-232 bus and the RS-422 bus. Likewise, when a display transmits to the WX-500 via RS-422, the WX-500 will then transmit data on the RS-422 bus and the RS-232 bus.
Why do I get a ‘Data Fail’ message on my MFD?
‘Data Fail’ means the MFD is not receiving RS-232 information from the WX-500 processor.
Check the RS-232 wiring between the MFD and the WX-500 processor. Ensure there is only one RS-232 or RS-422 transmitter connected to the WX-500 processor. Ensure that the RS-232 or RS-422 transmitter is functioning properly.
Why do I get a ‘WX Fail’ message on my MFD?
‘WX Fail’ means the Stormscope is in a failed condition. The failure could be caused by an internal fault in the processor or could be caused by an input into the WX-500 processor.
Why does my Stormscope work on the Stormscope page, but won’t overlay on the moving map?
There two reasons why the Stormscope may not overlay on a moving map:
Some MFD’s have a configuration setting to enable/disable the overlay function. Consult the display manufacturer’s technical publications for assistance with the configuration. Most MFD’s will require that the Stormscope must have heading data in order to overlay the strikes on the moving map. This heading data to the WX-500 has to be either synchro or RS-232 heading in order to provide the proper output to the MFD. RS-232 ground track from a GPS should not be used due to the increased possibility of developing errors.
What does it mean when LED 7 is on steady on the face of the WX-500?
‘WX Fail’ means the Stormscope is in a failed condition. The failure could be caused by an internal fault in the processor or could be caused by an input into the WX-500 processor.
Why does my Stormscope not display a lightning strike that I saw while I was flying?
There are two conditions that could cause this symptom:
The MIC Inhibit input J2-22 could be grounded. Whenever this input is grounded, the WX-500 will not transmit any new strikes. The MIC Inhibit input was designed to interface to the aircraft press-to-talk switches and prevent the Stormscope from displaying strikes during VHF Com transmissions. This input is typically used when the VHF Coms cause false storms on the WX-500. In some installations, flap motors and servomotors have been connected to prevent noise from being displayed while those motors are running. This can result in the WX-500 being inhibited during an actual lightning strike and therefore, the strike will not be displayed. If there is faulty aircraft wiring resulting in the MIC Inhibit wire to be grounded all the time, the WX-500 will fail after 60 seconds.
The remote Clear input J3-6 could be grounded.
Why does my WX-500 show false storms?
The WX-500 is detecting noise from an electrical system in the aircraft. It may be helpful to isolate certain conditions in which the false storms appear, or determine which phase of operation the false storms appear. This can be done by observing the Stormscope operation and noting the following conditions.
Do the false storms appear during ground operations with the engine(s) off? Do the false storms appear whenever the engine is running? Do the false storms appear only during flight?
To further determine the cause of the false storms, see Service Letter SL-148 and the Stormscope Noise Troubleshooting page.
Why do I get an Error 17 and/or Error 18 on my WX-500?
Once every ten seconds, the WX-500 processor sends a ‘test strike’ to the antenna. The return strike must come back at the correct range and bearing. If the strike comes back, but in the wrong location, an Error 17 is generated. If the test strike does not get returned at all, an Error 18 is generated. Errors 17 and 18 can be caused by the WX-500 Processor, the WX-500 Antenna or a wiring problem with the antenna cable, but most of the time, aircraft noise is to blame.
Determine if the WX-500 system is detecting noise interference using the following procedures:
On the WX-500 Display, press and hold the two left-hand Softkeys as you turn the system on. This will enter the ‘Service Menu.’ Scroll down to the ‘Noise Tests’ option and select it. This will take you to the Noise Monitor Page. Turn all electrical systems in the aircraft ON including all interior and exterior lights. Select the DME’s and Transponders to ON. Look for any ‘False Strikes’ to appear on the display. If no ‘False Strikes’ are shown on the Noise Monitor Page, it may be necessary to run the aircraft engine(s) to verify that the alternators, magnetos, or igniters are not producing any interference. This should only be done by qualified personnel. If there is no noise detected from any aircraft electrical system, then the WX-500 Processor and WX-500 Antenna should be bench tested and/or serviced. If ‘False Strikes’ are shown, you will need to troubleshoot the aircraft to find the cause of the noise. Service Letter SL-148 and the Stormscope Noise Troubleshooting page will guide you through the troubleshooting procedures.
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ESIS FAQs
What aircraft is the GH-3000 certified on?
The GH-3000 is STC'd and TC'd on a numerous aircraft. Service letter SL-169 has a list of aircraft and the facility that did the certification. L-3 Avionics Systems does not own any STC's for the GH-3000 system.
Is there an information package available to help with the installation and certification?
Yes. There is an interactive CD (TP-517) that contains instructions for ordering a system, supporting documentation for installation and documentation to help with the STC process.
I get a "red X" or a "flag" (red box) in the air speed and altitude window. What does this mean?
Before removing any components please review service letter SL-177.
The attitude does not return to zero right away after I have been in a long turn. What does this mean?
This is normal operation if your GH-3000 is a part number 501-1741-XX. Please review service letter SL-165. If your GH-3000 is a part number 501-1741-XXXX and does not have an air data computer this is normal operation. Adding an air data computer will correct for turn induced errors.
Does L-3 Avionics Systems have a procedure for biannual FAR 91.411 checks?
Yes. Service letter SL-176 covers the requirements of FAR 91.411, specifically appendix E, of PAR 43. This service letter covers air data computers with SSEC and without SSEC.
I have a failure message. What does it mean?
If the failure message is "configuration required:"
Verify the Detachable Configuration Module (DCM) is connected. Verify that the DCM is the correct part number for your aircraft. Reconnect the DCM and cycle power to the GH-3000. If you continue to get the message "configuration required," call L-3 Avionics Systems Field Service Department.
If the failure message is "Fan Failure:"
This is an informational message and does not stop the unit from working. If you get "Fan Failure" once, you will get it every time you power the unit up until it is returned to L-3 Avionics Systems for service. Only return the unit another problem is detected.
If the message is "System Test Failure:"
Wait 15 minutes and then cycle power. Wait 1 minute before you reapply power. If you get "System Test Failure" after power is reapplied, then the unit needs to be returned to L-3 Avionics Systems for service. The failure code that is displayed is an informational code used by the Repair Technician.
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AN/ARN-154(V) TACAN FAQs
What is TACAN?
TACAN stands for TACtical Air Navigation.
What is the difference between a DME and a TACAN?
DMEs are typically paired with the NAV receivers and the NAV Receiver provides the radial (bearing) to the ground station and the DME Receiver/ Transmitter (R/T) provides the distance to the ground station. A TACAN R/T provides the bearing and distance with the use of only one R/T.
Are the NAV frequencies and TACAN Frequencies the same?
Yes and No. When you tune the NAV receiver to 108.00 MHz the DME is receiving at 978 MHz and transmitting at 1041 MHz. The TACAN channel 17X is the same 978 MHz & 1041 MHz frequencies that the DME is using when the NAV is tuned to 108.00 MHz.
My TACAN is not passing the 1350 HZ audio tone. Why not?
The TX 670, TCN 970, and most versions of the RT 1634 use a synthesized audio output. The unit will decode the Morse code ident. and then send a synthesized tone to the audio panel, so the typical DME receiver test using the 1350 Hz will not work with most of our TACANs.
I am receiving the TACAN Bearing but not the distance. What is wrong?
The R/T is not transmitting. Bearing is transmitted by the ground station all the time but the distance portion is a response to an interrogation from the R/T.
My IN-602 display shows “FAILCODE 63” which is not listed in my manual. What does it mean?
The R/T has not responded to the turn on handshake and must be sent in for repair.
Will My TACAN drive my FMS?
That depends on the part number. Certain part numbers have analog outputs (ARINC 568 {analog and digital} bearing sine/cosine) or digital outputs (ARINC 429) but not both, so it is part number dependent.
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