Commonwealth legislation

AD/B747/131 - Flap Control Unit Wiring Change

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

This Airworthiness Directive mandates a wiring modification to the Flap Control Unit on Boeing 747‑400 airplanes (line numbers 696–1019 and 1021–1026) per Boeing Alert Service Bulletin 747‑27A2346 Rev 1. It prevents electrical connector disconnection on the Landing Gear Module that could disable all three flap control systems, risking a high‑speed, all‑flaps‑up landing. Compliance was required by 1 December 1994.

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/B747/131 - Flap Control Unit Wiring Change.

AD/B747/131 - Flap Control Unit Wiring Change

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/B747/131 Flap Control Unit Wiring Change 10/94

Applicability: Model 747-400 aircraft having line numbers 696 through 1019 inclusive and 1021

through 1026 inclusive.

Requirement: If not previously accomplished, revise the Flap Control Unit (FCU) input wiring in accordance with Boeing Alert Service Bulletin 747-27A2346 Revision 1 dated

19 May 1994.

Note: FAA AD 94-14-21 Amdt 39-8970 refers.

Compliance: Prior to 1 December 1994.

Background: The FAA has received reports of disconnection of the Landing Gear Module electrical connectors, this disconnection can result in the loss of the primary, secondary and alternate control of the flaps. Compliance with this Directive decreases the likelihood of an all-up-flaps landing due to the loss of control of all flap operations.

Source text

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

1 AD/B747/131 - Flap Control Unit Wiring Change