Commonwealth legislation

AD/B747/72 - Fuselage Crown Crease Beam

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of Boeing 747 aeroplanes (line numbers 66–603, excluding 747 SP, 747‑200 SUD and 747‑300 SUD) to carry out periodic detailed visual and dye‑penetrant inspections of the fuselage crown crease beam for cracks, following Boeing Service Bulletin 747‑53‑2297 Revision 1 and FAA AD 89‑08‑03. Pressurised flight cycles may be used in lieu of landings for counting compliance. The inspections are required to continue for the life of affected aircraft.

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AD/B747/72 - Fuselage Crown Crease Beam

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Boeing 747 Series Aeroplanes

AD/B747/72 Fuselage Crown Crease Beam 10/89

Applicability: Line numbers 66 through 603 except models 747 SP, 747-200 SUD and 747-300 SUD.

Requirement: Perform periodic detailed visual and dye penetrant inspections of the body crown crease beam for cracks, in accordance with Boeing Service Bulletin 747-53-2297 Revision 1, dated 26 January 1989. FAA AD 89-08-03 also refers.

Compliance: In accordance with FAA AD 89-08-03, except that pressurised flight cycles may be taken in lieu of landings.

Background: Five operators have reported cracks in the subject area, which has been determined to be critical to the aircrafts structural integrity. Hence an inspection program which will continue throughout the life of the affected aircraft is prescribed.

Source text

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