Commonwealth legislation

AD/B747/158 - Fuel Shut-Off Valve Wiring

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive requires operators of specified Boeing 747-400 aeroplanes to replace the engine fuel shut-off valve wire and sleeve with a wire in two non-metallic sleeves, using Boeing Alert Service Bulletin 747-28A2186. Owners/operators pay for and perform the work; the Civil Aviation Safety Authority requires and enforces compliance.

The rule aims to prevent wiring chafing and shorting that could stop crews from shutting off fuel in an engine fire. Work must be done by 23 May 1997; certain earlier Boeing-compliant replacements are accepted.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/B747/158 - Fuel Shut-Off Valve Wiring.

AD/B747/158 - Fuel Shut-Off Valve Wiring

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/B747/158 Fuel Shut-Off Valve Wiring 6/96

Applicability: This Directive is applicable to Model 747-400 series aircraft, with line positions 696 through 1046 inclusive, with the exception of line position 722 and 1035.

Requirement: Replace the fuel shut-off valve wire and sleeve in each engine strut conduit with a wire in two non-metallic sleeves in accordance with Boeing Alert Service Bulletin 747-28A2186 dated 19 January 1995.

Wire replacements accomplished prior to 23 May 1996, in accordance with Boeing Alert Service Bulletin 747-54A2157 dated 12 January 1995 or Revision 1 dated 3 August 1995, are considered acceptable for compliance with this requirement.

Note: FAA AD 96-03-14 Amdt 39-9511 refers.

Compliance: Prior to 23 May 1997.

Background: The FAA has received reports of additional occurrences of chafing and shorting of the engine fuel shut-off valve wiring since AD 89-14-04 Amdt 39-6246 was issued. The chafing and subsequent shorting of the wiring could result in the flight crews' inability to shut off the fuel supply in the event of an engine fire. Actions required by this Directive are designed to decrease the likelihood of wire chafing occurring.

Source text

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

1 AD/B747/158 - Fuel Shut-Off Valve Wiring