Originally Posted by
lucille
Strange. Maybe I missed it but as I read it, there was no record on the FDR of T/O Config Warning.
No FDR data (CB not pulled) only QAR data. Boeing says:
"... the take of parameter present in the QAR data would not have been triggered. The S651 switch (Speed brake handle stowed switch, BDA) signal is provided to the proximity sensor electronics unit (PSEU) which then provides outputs for the takeoff config lights and aural warning module. The takeoff config warning parameter recorded by the QAR is sourced from the flap-slat electronics unit (FSEU)."
So the data was recorded somewhere in the middle of the signal path before aditional trigger conditions (speed brake not stowed) were OR'ed to it.
They do not say if the Takeoff config warning would have been captured differently for the FDR
.
This perpetuates my views I expressed in the most recent MAX thread. E/E wise this plane was mess well before the MAX.