Topic-icon ATA 31-53, Flight Warning Computer Fail

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6 years 1 day ago - 5 years 11 months ago #100 by Mark
Not "all" functions of the FWC died, but troubleshooting was needed to isolate a possible grounding issue.



A300-600
AMM 31-53-34-04
Last edit: 5 years 11 months ago by Mark.

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6 years 1 day ago - 4 years 5 months ago #101 by Mark
Replied by Mark on topic Flight Warning Computer Fail
The FWC's are in the "right" tunnel area, aft by the pit door, not the left as stated in the vid. I had originally removed the #1 "FMC" not the #1 FWC, I'm 50+, shit ain't working so great as of late.

The reason for testing the Radio Alt's is to find out which FWC is responsible for the audio output. The default is #2. By testing the #2 Radio Alt, a call-out of "40" should be heard. The #1 Radio Alt will test, but no audio will be heard because the #2 is in the drivers seat. When I failed the #2 by yanking the breaker (the #2 was drunk, so the #1 took over audio output) and testing the #1 Radio Alt, I had no audio. That pretty much verified that the #1 FWC was at fault before I even went down to swap them.

The failures didn't show up until approx 60 seconds after power up. Sometimes patience is a virtue when dealing with troubleshooting digital systems.
Last edit: 4 years 5 months ago by Mark.
The following user(s) said Thank You: jake ounce

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