Airworthiness Directive · Amendment 39-9168 · BAE Systems (Operations) Limited Airplanes
BAE Systems (Operations) Limited Airplanes
This AD applies to BAE Systems (Operations) Limited BAe 146-100A, BAe 146-200A, BAe 146-300A.
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 all British Aerospace Model BAe 146-100A, -200A, and -300A series airplanes, that requires conducting closed loop tests to determine the setting of the underfrequency trip level on suspect generator control units (GCU), and either the correction of discrepancies or replacement of the GCU. This amendment is prompted by several malfunctions of in-service GCU's due to the effects of setting the underfrequency trip level too high. The actions specified by this AD are intended to correct GCU's that may have the underfrequency level set too high, which could result in the unwanted shut down of an electrical generator; this condition may lead to loss of all generated electrical power on the airplane when other generator faults or failures occur.
