Tue, Mar 21, 2006
Applicability:
BAE SYSTEMS - BAe 146 and AVRO 146-RJ series aircraft.
Requirement: 1. Identify suspect batch number
accumulators in accordance with BAe 146 series / Avro 146-RJ series
aircraft Inspection Service Bulletin ISB.29-A046 initial issue
dated 14 March 2006 or later EASA approved revisions. Only one
suspect accumulator is allowed to be installed on an individual
aircraft.
2. Where such an accumulator is identified, inspect accumulator in
accordance with ISB.29-A046.
3. Replace identified accumulator in accordance with para 2.D. of
ISB.29-A046
Terminating action: Replacement of identified
accumulator with serviceable accumulator is considered terminating
action from the requirements of this AD.
Note: EASA Emergency AD number 2006-0061-E
dated 17 March 2006 refers.
Compliance: 1. Within 48 hours after the
effective date of this AD.
2. On identification of the suspect accumulator and thereafter,
repetitively, at 48
hour inspection intervals, until terminated as detailed in
ISB.29-A046.
3. Not later than 31 May 2006.
This Airworthiness Directive becomes effective on 23 March
2006.
Background:
Following an in-service failure of a hydraulic accumulator, the
manufacturer has identified two suspect batches of accumulator
cylinders. Suspect hydraulic accumulators are identified in BAE
Systems ISB.29-A046. These accumulators may burst in service with
the potential to cause a hazardous event on the aircraft, with an
unacceptable probability of occurrence. Hazardous event being the
resultant flight crew workload associated with the loss of one or
more hydraulic circuits, combined with possible fuselage pressure
vessel rupture and possible cabin contamination with hydraulic
mist.
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