Commonwealth legislation

AD/B747/24 - Rear Fuselage Stringers S18 and S19 - Modification

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legislative instrument

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Requires operators of affected Boeing 747s (those listed in Boeing SB 747-53-2114 groups I & II, and group III when engines exceed 50,000 lb thrust) to reinforce rear fuselage stringers S18 and S19 by nesting a radius filler to reduce overload risk after an outer‑engine failure. Aircraft owners/operators must arrange and pay for the work under the FAA AD or Boeing Service Bulletin method and complete it by 31 January 1981. The airworthiness directive mandates compliance; it changes maintenance action and scheduling for affected fleets.

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AD/B747/24 - Rear Fuselage Stringers S18 and S19 - Modification

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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/B747/24 Rear Fuselage Stringers S18 and S19 - Modification 12/80

Applicability: All models listed in Boeing SB 747-53-2114 under groups I and II and those under group III if engines of thrust greater than 50000 lb. are installed.

Document: 1. FAA AD 80-20-01 Amdt. 39-3927; or

Boeing SB 747-53-2114, Rev. 3.

Compliance: Prior to 31 January 1981. As per requirement document No. 1.

Background: With installed thrust greater than 50000 lb., failure of an outer engine would require extreme rudder trim, causing excessive loads to be applied to stringers 18 and 19 in the rear fuselage. The Directive requires local reinforcement of these stringers by nesting a radius filler inside.

Source text

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