Commonwealth legislation

AD/B727/110 Amdt 2 - Wing Centre Section Front Spar Web

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Commonwealth

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legislative instrument

Plain English Summary

6/10 complexity

This Airworthiness Directive (AD) requires operators of Boeing 727 aeroplanes (line numbers 1–191) to carry out visual inspections of the wing centre section front spar web using Boeing Service Bulletin 727‑57‑0107 Rev 6, with staged initial inspection deadlines and 1,000‑flight repeat intervals until doublers and straps are fitted per Boeing Drawing No 65‑78836. Amendment 2 adds extra repeat inspections for aircraft that had back‑to‑back angles fitted because some of those installations have been found to crack; operators bear the inspection and compliance costs and must follow CASA’s mandated schedule.

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AD/B727/110 Amdt 2 - Wing Centre Section Front Spar Web

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Boeing 727 Series Aeroplanes

AD/B727/110

Amdt 2

Wing Centre Section Front Spar Web 2/93

Applicability: Line Numbers 1 to 191.

Requirement: Visually inspect the wing centre section front spar web in accordance with Boeing Service Bulletin 727-57-0107 Revision 6.

Note: FAA AD 90-20-02 refers.

Compliance: If back to back angles were installed before 20000 flights:

Inspect within 12000 flights after installation of the angles, or within 1000 flights since last inspected in accordance with the previous issue of this AD, or within 1000 flights after 4 February 1993, whichever is the latest.

If back to back angles have not been installed, or were installed after 20000 flights:

Inspect before 15000 flights, or within 1000 flights since last inspected in accordance with the previous issue of this AD, or within 1000 flights after 4 February 1993, whichever is the latest.

Re-inspect at intervals not exceeding 1000 flights, until the doublers and straps have been installed per Boeing Drawing No 65-78836.

Background: Fatigue cracks caused by pressurisation cycling have been found in the subject area. Amendment 2 is issued to require further repeat inspections to aircraft that have been previously modified by installing additional angles back-to-back with existing stiffeners, as several of these installations have been subsequently found to crack.

Source text

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

1 AD/B727/110 Amdt 2 - Wing Centre Section Front Spar Web