Commonwealth legislation

AD/DHC-8/15 Amdt 3 - MLG Actuator Support Bracket and Bolts

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of Bombardier/De Havilland DHC‑8 Series 100 and 300 (serials 3–400 except 391) to carry out the technical actions in Transport Canada AD CF‑91‑25R2: bolt torque checks, non‑destructive inspection if looseness is found, and a re‑torque of the main‑landing‑gear retraction actuator fasteners 50–100 flights after Modification 8/2049. A terminating modification may replace repetitive inspections. Compliance deadlines are fixed by the Directive (effective 12 Oct 1995; paragraph 3 revised to 12 Dec 1995).

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Direct links to the current provisions in AD/DHC-8/15 Amdt 3 - MLG Actuator Support Bracket and Bolts.

AD/DHC-8/15 Amdt 3 - MLG Actuator Support Bracket and Bolts

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/15

Amdt 3

MLG Actuator Support Bracket and Bolts 11/95

Applicability: Model DHC-8 Series 100 and 300, with serial numbers 3 through 400, but not including 391.

Requirement: Action in accordance with the technical requirements of Transport Canada AD CF- 91-25R2.

Note: de Havilland SB 8-54-27 and SB 8-54-34 refer.

Compliance: As specified in the Requirement Document, with a revised compliance of

12 December 1995 for paragraph 3 of the Requirement Document for additional aircraft affected by this amendment of the Directive.

The compliance of the previous issue of this Directive remains unchanged with an exception as stated in the compliance statement. This Amendment is effective from 12 October 1995.

Background: An incident occurred where all hydraulic power was lost in-flight when a MLG retract actuator support bracket bolt failed. This occurrence allowed unrestricted actuator movement which resulted in damage to adjacent hydraulic lines.

Amendment 1 required specific torque checks on the bolts, and a non-destructive test on the support bracket if bolt looseness is detected.

Amendment 2 required terminating action in lieu of the on-going repetitive inspections.

Amendment 3 is issued in response to a revision of the Requirement Document, which mandates compliance with Revision A of Service Bulletin 8-54-34 that has new requirements added for a re-torque of the fasteners of the retraction actuator fitting between 50 and 100 flights after incorporation of Modification 8/2049.

Source text

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

1 AD/DHC-8/15 Amdt 3 - MLG Actuator Support Bracket and Bolts