Commonwealth legislation

AD/B747/99 - Differential Protection Current Transformers - Wiring

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This AD mandates re‑routing and shielding of differential protection current‑transformer wiring in the P6 panel of specified Boeing 747s, to be done per Boeing Service Bulletin 747‑24‑2154 by the compliance date. It affects listed operators, shifts cost and scheduling onto them, and aims to remove a single‑fault vulnerability that could cause loss of normal aircraft power.

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AD/B747/99 - Differential Protection Current Transformers - Wiring

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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/B747/99 Differential Protection Current Transformers - Wiring

Applicability: As specified in the requirement document.

Requirement: Action in accordance with the Boeing Service Bulletin 747-24-2154.

Note: FAA AD 91-18-05 also refers.

Compliance: Prior to 18 March 1992.

12/91

Background: This AD is issued following a 747 Safety Assessment which demonstrated that the potential exists for a single fault to cause the loss of all normal sources of aircraft power. Compliance with this AD requires re-routing and adding shielded wiring associated with the differential protection current transformers in the P6 panel.

Source text

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