From slot #1766, a few posts prior:
"... The likelyhood of a flap fault and a config warning, that did not work is marginal... probably ... crew error - as the Detroit accident."
That possible CAWS /power supply fault, and the P40 C/B fault, was discussed in DTW
AAR 88/05 on pgs 52-56. Later, there were three
FINDINGS and the
P.C. that mentioned the possible faults:
"9. The CAWS unit’s takeoff warning system was inoperative and, therefore, did not warn the flightcrew that the airplane was not configured properly for takeoff.
"10. The failure of the takeoff warning system was caused by the loss of input 28V dc. electric power between the airplane’s left dc. bus and the CAWS unit.
"11. The interruption of the input power to the CAWS occurred at the P-40 circuit breaker. The mode of interruption could not be determined."
"... the probable cause of the accident was the flightcrew’s failure to use the taxi checklist to ensure that the flaps and slats were extended for takeoff. Contributing to the accident was the absence of electrical power to the airplane takeoff warning system which thus did not warn the flightcrew that the airplane was not configured properly for takeoff. The reason for the absence of electrical power could not be determined."