Commonwealth legislation

AD/DHC-6/45 Amdt 1 - Fuselage Side Frames Stns 218.125 and 219.525

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive applies to DHC‑6 (Twin Otter) aeroplanes, serial numbers 1–411. It requires operators to carry out inspections per de Havilland Service Bulletin 6/371 until they install specified structural modifications (de Havilland mods 6/1461 or 6/1553, and 6/1462); the modifications must be completed by 1 January 1996 (AD effective 2 April 1992).

The directive responds to inter‑rivet cracking at fuselage side‑frame stations 218.125 and 219.525; Amendment 1 replaces repeating inspections with a terminating modification to address material and stress issues.

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Current sections

Direct links to the current provisions in AD/DHC-6/45 Amdt 1 - Fuselage Side Frames Stns 218.125 and 219.525.

AD/DHC-6/45 Amdt 1 - Fuselage Side Frames Stns 218.125 and 219.525

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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DHC-6 (Twin Otter) Series Aeroplanes

AD/DHC-6/45

Amdt 1

Fuselage Side Frames Stns 218.125 and 219.525 4/92

Applicability: Model DHC-6 Series with serial numbers 1 through 411 inclusive. Requirement: 1. Action in accordance with de Havilland SB 6/371.

Incorporate de Havilland modifications 6/1461 (or 6/1553) and 6/1462.

Note: Transport Canada AD CF-78-17 R1 refers.

Compliance: 1. At intervals as specified in the requirement document, until modified in accordance with Requirement 2.

Prior to 1 January 1996.

The compliance of the previous issue of this Directive was as per Requirement Document.

This amendment is effective from 2 April 1992.

Background: Inter-rivet cracking of the fuselage side frame skin flanges at Stations 218.125 and

219.525 has occurred on a number of aircraft in service. Cracks are initiated by stress induced by riveting; side frames of material with improved stress corrosion resistance have been introduced by the manufacturer.

Amendment 1 is issued to align this Directive with a revision of the relevant Country of Origin AD which requires terminating action in lieu of on going repetitive inspections.

Source text

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

1 AD/DHC-6/45 Amdt 1 - Fuselage Side Frames Stns 218.125 and 219.525