Airworthiness Directive · Amendment 39-21560 · Lights
BAE Systems (Operations) Limited Airplanes
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.
The FAA is adopting a new airworthiness directive (AD) for all BAE Systems (Operations) Limited Model BAe 146 and Model Avro 146-RJ series airplanes. 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 certain power units were found to show signs of burning. This AD requires replacing each Honeywell emergency light power unit having a certain part number with a serviceable emergency light power unit. The FAA is issuing this AD to address the unsafe condition on these products.
(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.
Within two months after the effective date of this AD: Replace each affected part with a serviceable part.
Note 1 to paragraph (h): BAE Systems (Operations) Limited Service Bulletin ISB.33-081, dated November 4, 2019, contains information related to the replacement specified in paragraph (h) of this AD.
