Commonwealth legislation

AD/B767/31 - EEC System Electromagnetic Shielding

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This directive requires operators of Boeing 767 series aeroplanes to modify the Electronic Engine Control (EEC) electromagnetic shielding per Boeing Service Bulletin SB 767‑71‑0041 (or later revision) by 25 April 1991. It affects airlines and maintenance providers, aims to reduce the risk of lightning‑induced EEC malfunction and uncommanded thrust loss, and is enforced by CASA; operators bear the costs and downtime for compliance.

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AD/B767/31 - EEC System Electromagnetic Shielding

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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 767 Series Aeroplanes

AD/B767/31 EEC System Electromagnetic Shielding 1/90

Applicability: As detailed in the Requirement Document.

Requirement: Action in accordance with Boeing SB 767-71-0041 R2 or later revision.

Note: FAA AD 89-21-04 refers.

Compliance: Prior to 25 April 1991.

Background: Boeing have advised that at the maximum probable lightning threat level, lightning induced voltage transients in excess of the EEC qualification requirement may result. A lightning strike at take-off could therefore adversely affect EEC operation and could result in uncommanded thrust loss greater than the loss of one engine.

Source text

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