Commonwealth legislation

AD/B747/157 Amdt 1 - P&W JT9D Aft Engine Mount Tangential Link

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This mandatory Civil Aviation Safety Authority airworthiness directive requires owners/operators of Boeing 747s with Pratt & Whitney JT9D engines (line positions 1–668, excluding -70 series) to inspect and, if needed, correct the tangential link upper bolt on the rear engine mount to prevent it backing out.

This is Amendment 1, which only corrects wording from the FAA text; the safety requirement and compliance timeline remain unchanged.

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Current sections

Direct links to the current provisions in AD/B747/157 Amdt 1 - P&W JT9D Aft Engine Mount Tangential Link.

AD/B747/157 Amdt 1 - P&W JT9D Aft Engine Mount Tangential Link

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Boeing 747 Series Aeroplanes

AD/B747/157

Amdt 1

P&W JT9D Aft Engine Mount Tangential Link 7/96

Applicability: Model 747 series, with P&W JT9D engines, line positions 1 to 668 except -70s. Requirement: Action in accordance with Boeing 747 ASB 747-71A2277.

Note: FAA AD 96-03-01 R1 Amdt 39-9538 refers.

Compliance: Unless the initial inspection has already been accomplished in accordance with the previous issue of this Directive; as specified in the Requirement Document.

The compliance of the previous issue of this Directive required an initial inspection within 90 days after 13 March 1996. This amendment is effective from 20 June 1996.

Background: The tangential link upper bolt was found to have backed out, following lubrication of the threads and/or inadequate nut torque, which allowed the nut to rotate and disengage.

Amendment 1 is issued to reflect a revision of the associated country of origin AD which was issued to clarify an error in the text.

The original issue of this Airworthiness Directive became effective on 13 March 1996.

Source text

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

1 AD/B747/157 Amdt 1 - P&W JT9D Aft Engine Mount Tangential Link