Commonwealth legislation

AD/DHC-2/23 Amdt 1 - Stabilising Fins

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Commonwealth

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legislative instrument

Plain English Summary

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This CASA airworthiness directive mandates that certain DHC‑2 (Beaver) float and amphibious floatplanes using specified EDO/Type‑A22 floats be fitted with stabilising (and wipline ventral) fins where not already installed, following Transport Canada AD CF‑83‑09 R2. It makes the retrofit mandatory before further flight, affecting owners/operators (who bear cost and downtime) and maintenance providers, to address hazardous adverse directional stability.

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AD/DHC-2/23 Amdt 1 - Stabilising Fins

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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DHC-2 (Beaver) Series Aeroplanes

AD/DHC2/23

Amdt 1

Stabilising Fins 8/91

Applicability: Model DHC-2 Mk I and Mk II Beaver aircraft equipped with EDO Model 679-4930 floats; or floats or amphibious floats listed in Type approval Number A-22, at Issue 20, but not equipped with fins as specified in the Requirement Document.

Requirement: Action IAW the Technical Requirements of Transport Canada AD CF-83-09 R2. Compliance: Unless already accomplished; prior to further flight after 8 August 1991.

Background: Flight tests indicate that a DHC-2 Beaver Mk I or Mk II equipped as a floatplane or an amphibious floatplane, may exhibit hazardous adverse directional stability when not equipped with fins as specified.

This amendment is raised in response to Revision 2 of the Requirement Document, which has been issued to combine AD CF-76-15 (25 Aug 76) and AD CF-83-09 R1 (2 Mar 89), and to include wipline ventral fin and stabilising fins.

Source text

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

1 AD/DHC-2/23 Amdt 1 - Stabilising Fins