Commonwealth legislation

AD/B747/58 - Hydraulic Fuse

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This AD requires operators of the specified Boeing 747 models to install a hydraulic fuse in the No. 4 hydraulic system per Boeing Service Bulletin 747‑29‑2063 (or a later FAA‑approved revision) by 31 July 1989.

Issued after an incident where rear pressure bulkhead failure led to loss of the vertical stabiliser and all hydraulics, the rule aims to reduce the risk of total hydraulic loss; technical details and costs are defined in the Service Bulletin, not the AD.

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AD/B747/58 - Hydraulic Fuse

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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/B747/58 Hydraulic Fuse 10/87

Applicability: Model 747 series aircraft as listed in Boeing Service Bulletin 747-29-2063.

Requirement: In accordance with Boeing Service Bulletin 747-29-2063 dated 23 December 1986 or later FAA approved revision.

Compliance: Prior to 31 July 1989.

Background: The installation of a hydraulic fuse in the No. 4 hydraulic system is prompted by the incident in which all four hydraulic systems were lost when failure of the rear pressure bulkhead resulted in loss of the vertical stabiliser.

Source text

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