Commonwealth legislation

AD/DHC-6/36 Amdt 2 - Overhead Console Control Quadrants

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive requires DHC-6 (Twin Otter) operators to inspect the overhead control-quadrant assembly per de Havilland Service Bulletin 6/519 and, where specified crack criteria are met, to install Modification 6/1895. It sets short inspection intervals (including a 100‑flight‑hour check) and firm compliance deadlines, and states that the modification is terminating action. Operators bear the cost and must change maintenance and inspection practices to meet the specified intervals and modification timeline.

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AD/DHC-6/36 Amdt 2 - Overhead Console Control Quadrants

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-6/36

Amdt 2

Overhead Console Control Quadrants 3/95

Applicability: Model DHC-6 series aircraft.

Requirement: Accomplish the following as required by Transport Canada AD CF-73-06R2:

Inspect the control quadrant assembly in accordance with Part A of Accomplishment Instructions of de Havilland Service Bulletin 6/519.

If no cracks are found per the criteria of Part A of the Accomplishment Instructions of Service Bulletin 6/519, carry out periodic inspections in accordance with de Havilland Inspection Requirements Manual PSM 1-6-7, Chapter 76 until Modification 6/1895 is incorporated.

If cracks are found per the criteria of Part A, paragraph 4 of Service Bulletin 6/519, incorporate de Havilland Modification 6/1895 (SB 6/519 refers).

If cracks are found per the criteria of Part A, paragraph 5 of Service Bulletin 6/519, incorporate Modification 6/1895 within 200 flight hours.

Inspect for crack propagation at 100 flight hours since last inspection to confirm that the magnitude and location of cracks remain within given limits.

2. Incorporate Modification 6/1895.

Note: Incorporation of de Havilland Modification 6/1895 provides terminating action for this Directive.

Compliance: 1. Within 100 hours time in service after 2 March 1995.

Prior to 1 January 1997.

Background: Cracking and fracture of the control cable quadrants (P/N C6CE 1010-27 and -29) in the overhead control console were found on aircraft in service. Amendment 1 required modification action in lieu of on-going repetitive inspections.

Amendment 2 is issued as a result of reports of in-service cracking of the previously modified quadrants, and further inspections are required until an improved modification is incorporated.

Source text

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

1 AD/DHC-6/36 Amdt 2 - Overhead Console Control Quadrants