Airworthiness directives › 2021-10-27
AD 2021-10-27 Airworthiness Directives; BAE Systems (Operations) Limited Airplanes
Models named: BAe 146-100A, -200A, -300A, Avro 146-RJ70A, 146-RJ85A, 146-RJ100A. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all BAE Systems (Operations) Limited airplanes specified in paragraphs (c)(1) and (2) of this AD, certificated in any category. (1) Model BAe 146-100A, -200A, and -300A airplanes. (2) Model Avro 146-RJ70A, 146-RJ85A, and 146-RJ100A airplanes.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) An affected part is defined as a Honeywell emergency light power unit, having part number 60-3550-1, except for those modified and marked using the instructions specified in Honeywell Service Bulletin 60-3550-33-0001, Revision 1, dated September 3, 2013. (2) A serviceable part is defined as an emergency light power unit that is not an affected part. (3) Group 1 airplanes are those that have an affected part installed. (4) Group 2 airplanes are those that do not have an affected part installed.
Unsafe condition
This AD was prompted by a report indicating that during a routine battery capacity check on the emergency light power units, the printed circuit boards (PCBs) for power units LE 10 and LE 22 (Illustrated Parts Catalog (IPC) 33-50-00) were found to show signs of burning. The FAA is issuing this AD to address heat damage of the PCBs, which could lead to battery discharge and possibly result in lack of power supply to the emergency light units when needed.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1