Commonwealth legislation

AD/DHC-8/64 - Wing Fuel Tanks - Access Panel Sealing

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This Airworthiness Directive requires operators of De Havilland DHC‑8 aeroplanes (serials 3–543) to change the upper wing fuel tank access panel seals using ModSum 8Q1000797 per Bombardier Service Bulletin 8‑57‑41 by 9 February 2000. The work restores correct panel fit and the lightning-protection path for the wing tanks. Operators pay for parts and labour and incur short aircraft downtime; the mandated maintenance substitutes a known, one‑off compliance cost for a reduced risk of corrosion, fretting and loss of lightning protection.

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AD/DHC-8/64 - Wing Fuel Tanks - Access Panel Sealing

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/64 Wing Fuel Tanks - Access Panel Sealing 10/99

Applicability: All DHC-8 aircraft, all Models, serial numbers 3 through 543.

Requirements: Change Wing Tank Access Panel Seals, using ModSum 8Q1000797, in accordance with the provisions of Bombardier Service Bulletin 8-57-41, dated 9 February 1999.

Note: Transport Canada Airworthiness Directive CF-99-20 dated 20 July 1999 refers.

Compliance: Prior to 9 February 2000 unless previously accomplished.

This Airworthiness Directive becomes effective on 7 October 1999.

Background: During routine maintenance a sealing problem has been discovered with the upper wing tank access panels. An O-ring larger than specified had been fitted to the access panel during production with the result that the access panel fit was incorrect. This poor fit could lead to eventual loss of lightning protection for the fuel tanks through fretting and corrosion of the wing ladder plate and displacement of the adjacent channel seal.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/DHC-8/64 - Wing Fuel Tanks - Access Panel Sealing