SUMMARY: This AD
results from mandatory continuing airworthiness information (MCAI)
originated by an aviation authority of another country to identify
and correct an unsafe condition on an aviation product. The MCAI
describes the unsafe condition as:
Two cases have been reported in which the ADG [air driven
generator] has failed to power the essential bus following
in-flight deployment as part of its periodic operational check.
Subsequent inspection revealed that the ADG power feeder harness
wire (* * * [aromatic polyimide]) had chafed on the backshell of
its own connector (P1XC), resulting in a short circuit, wire damage
and disconnection of the wire from the ADG. Coupled with a dual
generator failure, such a disconnection would result in the loss of
emergency power to critical systems, with a consequent adverse
effect on the controllability of the aircraft.