Commonwealth legislation

AD/DHC-8/33 - Electronic Engine Control Cable Harness Lightning Protection

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive requires operators of specified Bombardier (De Havilland) DHC‑8 aeroplanes (particular models and serial numbers) to carry out a one‑time inspection of the electronic engine control cable harness shield grounds and to rework any grounds that do not meet the resistance specifications, following Bombardier Service Bulletin S.B. 8‑73‑18 or S.B. 8‑73‑19. Compliance was required by 28 August 1994.

It affects the listed aircraft owners/operators by imposing a mandatory inspection and corrective‑maintenance obligation after an incident showed previously mandated modifications had not been correctly grounded.

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/DHC-8/33 - Electronic Engine Control Cable Harness Lightning Protection.

AD/DHC-8/33 - Electronic Engine Control Cable Harness Lightning Protection

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/33 Electronic Engine Control Cable Harness Lightning Protection

8/94

Applicability: Models 102, 103 and 106, serial numbers 3 to 369 inclusive, and Models 301, 311

and 314, serial numbers 100 to 370 inclusive.

Requirement: Action in accordance with Bombardier Regional Aircraft Division de Havilland Dash 8 Service Bulletin S.B. 8-73-18 dated 29 April 1994 or SB 8-73-19 dated 29 April

1994 as applicable.

Note: Transport Canada AD CF-94-09 dated 6 May 1994 refers.

Compliance: Prior to 28 August 1994.

Background: AD/DHC-8/7 Amdt 1 required the incorporation of five modifications designed to minimise the danger of lightning transient-induced damage to the electronic engine control units. Transport Canada have advised, that despite the required modifications being incorporated a DHC-8 aircraft experienced an engine flameout following a lightning strike, subsequent investigation revealed several engine control cable harness shields were not grounded in accordance with the modifications. This Directive requires a one time inspection to verify the integrity of the engine control cable harness shield grounds and, if necessary, the rework of any grounds that do not satisfy the resistance measurement specifications.

Source text

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

1 AD/DHC-8/33 - Electronic Engine Control Cable Harness Lightning Protection