Airworthiness Directive · Amendment 39-9128 · BAE Systems (Operations) Limited Airplanes
BAE Systems (Operations) Limited Airplanes
This AD applies to BAE Systems (Operations) Limited ATP.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to certain British Aerospace Model ATP airplanes, that requires inspections to detect damage, overheating, and proper operation of the DC connections and cooling fans in certain transformer rectifier units (TRU), and repair or replacement, if necessary. This amendment is prompted by a report of the loss of all DC electrical power, except for the battery emergency bus, due to failure of the TRU's, which occurred during flight. The actions specified by this AD are intended to prevent such failures that could lead to loss of essential electrical power required to continue safe flight of the airplane.
