I have a test bed in which the FMC and MCDU are hooked up to one another.
FMC menu was populated on MCDU and was able to be navigated.
After making some changes to the FMC GPS #2 lines, the FMC started acting up and would then fail.
Since failure, the FMC menu would no longer display on the MCDU even after the fail was cleared.
Just wondering what is it that I’m missing.
No wiring from FMC to MCDU was touched and only GPS & IRS busses 1&2 were ever replaced.
We can tap into the FMC and see that it is sending some data to the MCDU but the FMC menu still fails to populate.