Airworthiness DirectiveEASA AD CF-2020-07

Lights — Emergency Light Battery Pack Corrosion

Published: Mar 30, 2020
Effective: Mar 31, 2020
Deadline: Jun 30, 2021

Bombardier BD-700 1A10

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What to do

Operators of affected Bombardier BD-700-1A10 aircraft must inspect and replace emergency light battery packs within 15 months of the directive's effective date, following Bombardier Service Bulletin 700-33-024. Additionally, within 60 days, maintenance schedules must be updated to include the restoration task 33-51-54-603, with repeat intervals every 48 months or as specified. Aircraft that have already completed equivalent tasks before the effective date may follow adjusted compliance timelines as detailed in the directive.

Summary

Canadian Airworthiness Directive CF-2020-07 addresses corrosion issues in the Emergency Light Battery Packs of Bombardier BD-700-1A10 aircraft, specifically affecting a defined range of serial numbers. The directive mandates inspection and replacement of internal lead acid batteries in the emergency light battery packs to prevent electrical short circuits and overheating. It also requires incorporation of a new maintenance task into the aircraft's maintenance schedule to ensure ongoing safety.

What changed

This new Airworthiness Directive introduces mandatory inspection and replacement of emergency light battery packs if their internal batteries are four years old or older, following Bombardier Service Bulletin 700-33-024. It also requires operators to amend maintenance schedules to include a restoration task for these batteries with specified compliance intervals. The directive clarifies previous misidentifications of restoration tasks in certain maintenance revisions and provides updated task references.

Why it matters

This directive is critical for aviation professionals as it mitigates the risk of onboard fire caused by battery corrosion and electrical short circuits in emergency lighting systems. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and passenger safety. Failure to comply could result in operational restrictions and increased safety hazards.

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