Commonwealth legislation

AD/AS 355/83 - Tail Rotor Blade Trailing Edge Tab

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

What it does: Requires installation of additional rivets on the trailing‑edge tab of specified Eurocopter AS 355 tail‑rotor blades to address reported tab debonding.

Who it affects and why it matters: Owners/operators of AS 355 E/F/F1/F2/N helicopters with blade part numbers 355A12.0040 or 355A12.0050, serial numbers 8400–9224 (unless Repair Sheet FR No. 238 or Work Card 64.10.00.872 is already incorporated). Compliance is mandatory within 100 flight hours or three months of 20 January 2005; operators pay for and arrange the work performed to a Eurocopter Alert Service Bulletin (Requirement).

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Current sections

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Eurocopter AS 355 (Twin Ecureuil) Series Helicopters

AD/AS 355/83 Tail Rotor Blade Trailing E

AD/AS 355/83 Tail Rotor Blade Trailing Edge Tab 1/2005

Applicability: AS 355 helicopters, versions E, F, F1, F2, and N, fitted with tail rotor blades part number 355A 12.0040 all dash numbers, and part number 355A 12.0050 all dash numbers, with serial numbers from 8400 through 9224, before incorporation of Repair Sheet FR No. 238 or incorporation of Work Card 64.10.00.872 (Refer to equipment log card (FME)).

Note: Eurocopter AS 355 Alert Service Bulletin No. 64.00.04 corresponds to Repair Sheet FR No. 238.

Requirement: Install additional rivets on the trailing edge tab of blades in accordance with paragraph 2.B. of Eurocopter Alert Service Bulletin No.64.00.04 or later EASA approved revision.

Note: DGAC AD F-2004-176 refers.

Compliance: Within 100 flight hours or 3 months after 20 January 2005, whichever occurs first.

This Airworthiness Directive becomes effective on 20 January 2005.

Background: Reports were received of significant tail rotor blsade trailing edge tab debonding.

Reduced security of the trailing edge tab due to debonding could lead to loss of the tab if it is not monitored, and result in a significant increase in the vibration level.

View image in the official source

David Villiers

Delegate of the Civil Aviation Safety Authority 3 December 2004

View image in the official source

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

Eurocopter AS 355 (Twin Ecureuil) Series Helicopters

AD/AS 355/83 Tail Rotor Blade Trailing E AD/AS 355/83 Tail Rotor Blade Trailing Edge Tab 1/2005

AD/AS 355/83 Tail Rotor Blade Trailing Edge Tab 1/2005

Note: Eurocopter AS 355 Alert Service Bulletin No. 64.00.04 corresponds to Repair Sheet FR No. 238.

Requirement: Install additional rivets on the trailing edge tab of blades in accordance with paragraph 2.B. of Eurocopter Alert Service Bulletin No.64.00.04 or later EASA approved revision.

Note: DGAC AD F-2004-176 refers.

Compliance: Within 100 flight hours or 3 months after 20 January 2005, whichever occurs first.

This Airworthiness Directive becomes effective on 20 January 2005.

Background: Reports were received of significant tail rotor blsade trailing edge tab debonding.

Reduced security of the trailing edge tab due to debonding could lead to loss of the tab if it is not monitored, and result in a significant increase in the vibration level.

David Villiers

Delegate of the Civil Aviation Safety Authority 3 December 2004