Commonwealth legislation

AD/DHC-6/46 Amdt 4 - Flap Operating Rod Assemblies and Control Rods

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This amendment requires owners/operators of DHC‑6 (Twin Otter) aircraft to comply with Transport Canada AD CF‑79‑22 R1, adds De Havilland SB 6/502 and inspection intervals for 6061‑T6 flap control rods, and sets a revised Australian effective date. It responds to observed stress‑corrosion cracking on flap control rods, shifts timing for Australian registrants, and places inspection and repair costs and implementation responsibility on aircraft owners/operators.

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-6/46 Amdt 4 - Flap Operating Rod Assemblies and Control Rods.

AD/DHC-6/46 Amdt 4 - Flap Operating Rod Assemblies and Control Rods

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
DHC-6 (Twin Otter) Series Aeroplanes

AD/DHC-6/46

Amdt 4

Flap Operating Rod Assemblies and Control Rods 2/92

Applicability: Model DHC-6 series.

Requirement: Action in accordance with the technical requirements of Transport Canada AD CF- 79-22 R1.

Note: De Havilland SB 6/388 Revision C and SB 6/502 refers.

Compliance: As specified in the Requirement Document with a revised effective date of 3 February 1992 for Australian registered aircraft. The compliance of the previous issue of this Directive was “as per Requirement Document”.

Background: Instances of stress-corrosion cracking have occurred on original equipment 2024-T3 alloy flap control rods. Amendment 4 introduces SB 6/502 and the appropriate inspection interval for 6061-T6 control rods pursuant to Transport Canada’s Aging Aircraft program. The effective date required by Transport Canada is extended by four months.

Source text

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

1 AD/DHC-6/46 Amdt 4 - Flap Operating Rod Assemblies and Control Rods