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Mon, Mar 11, 2013

AD: BAE SYSTEMS (OPERATIONS) LIMITED Airplanes

AD NUMBER: 2013-04-13

PRODUCT: All BAE SYSTEMS (OPERATIONS) LIMITED Model BAe 146 and Avro 146-RJ series airplanes.
SUBJECT: Airworthiness Directive 2013-04-13
ACTION: Final Rule

SUMMARY: This AD was prompted by a report that certain ceramic terminal blocks, through which the wiring for the engine fire extinguishers, fire detection circuits, and engine and intake anti-ice system are routed, have been found to have moisture ingress, which can degrade the insulation resistance of the ceramic terminal blocks.

This AD requires a one-time insulation resistance test of ceramic terminal blocks, and if necessary, replacement of the blocks. The FAA is issuing this AD to prevent latent failure of the number 2 fire bottle, which, in the event of an engine fire, could result in failure of the fire bottle to discharge when activated and possibly preventing the flightcrew from extinguishing an engine fire.

DATES: This AD becomes effective April 11, 2013.

FMI: AD

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