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

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5 years 4 weeks ago - 5 years 6 days ago #100 by Mark D Francis
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 6 days ago by Mark D Francis.

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5 years 4 weeks ago - 3 years 6 months ago #101 by Mark D Francis
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: 3 years 6 months ago by Mark D Francis.
The following user(s) said Thank You: Mike Forti

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