Commonwealth legislation

AD/B747/36 Amdt 1 - Frame to Tension Tie Joint Body Station 760 or 780

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

3/10 complexity

What it is: This is a safety order (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority for all Boeing 747 aircraft operators.

What it requires: Airlines must follow a specific Boeing technical instruction (Service Bulletin 747-53-2088 Revision 2) to inspect and repair potential cracks where the aircraft's frame connects to tension ties at specific structural locations (Body Stations 760 or 780). This maintenance must be completed before the aircraft reaches 10,000 flight cycles (roughly 10,000 takeoff-and-landing trips).

Why it matters: Engineers discovered cracking in these joints during fatigue testing of a 747 airframe. Because failures in these areas could compromise the aircraft's structural integrity during flight, this directive mandates repairs to prevent catastrophic failure.

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Current sections

Direct links to the current provisions in AD/B747/36 Amdt 1 - Frame to Tension Tie Joint Body Station 760 or 780.

AD/B747/36 Amdt 1 - Frame to Tension Tie Joint Body Station 760 or 780

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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/B747/36

Amdt 1

Frame to Tension Tie Joint Body Station 760 or 780 2/86

Applicability: All aircraft listed in the Requirement Document. Requirement: Boeing SB 747-53-2088 Revision 2.

Compliance: Prior to achieving 10,000 flight cycles.

Background: Cracking was found on the B747 fatigue test airframe. This AD has been raised because SB 53-2088 has been identified by the B747 Supplemental Structural Inspection Document as having flight safety implications. This amendment reflects the revision status of the S.B.

Source text

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