Commonwealth legislation

AD/S-76/72 - Main Landing Gear Brake Discs - Replacement

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive orders operators of Sikorsky S‑76A/B/C helicopters with specified main landing gear brake assemblies to check for brake disc P/N 5014067 and, if found, replace it with P/N 5007672 and re‑identify the assembly. It also requires increasing rejected takeoff and landing distances in the Rotorcraft Flight Manual by multiplying those distances by 1.67. The actions must follow the referenced Aircraft Braking Systems Alert Service Bulletins and be carried out by operators and maintenance organisations.

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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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Sikorsky S-76 Series Helicopters

AD/S-76/72 Main Landing Gear Brake Discs

AD/S-76/72 Main Landing Gear Brake Discs - Replacement 10/2003

Applicability: Model S-76A, B and C series helicopters, with main landing gear brake (MLG) assembly part number (P/N) 5007555, 5007555-1, or 5007555-2 installed.

Requirement: 1. Determine if a MLG brake disc P/N 5014067 is installed in the braking assembly in accordance with:

(a) For brake assembly P/N 5007555 and P/N 5007555-1:

Section 111-Acommplishment Instructions, paragraph 1.A. to 1.D., of Aircraft Braking Systems Corporation Alert Service Bulletin (ASB) S76-32-A24, dated 10 April 2002; and

(b) For brake assembly P/N 5007555-2:

Section 111-Acommplishment Instructions, paragraph 1.A. and 1.B., of Aircraft Braking Systems Corporation ASB S76-32-A25, dated 15 May 2002.

2. If it is determined, in compliance with Requirement 1, that a disc P/N 5014067 is installed, remove that disc and replace with disc P/N 5007672 and re-identify brake assembly:

(a) P/N 5007555 and P/N 5007555-1 as brake assembly P/N 5007555-3, in accordance with the conversion of brake assembly instructions on page 6 of ASB S76-32-A24, dated 10 April 2002; and

(b) P/N 5007555-2 as brake assembly P/N 5007555-4, in accordance with the conversion of brake assembly instructions on page 6 of ASB S76-32-A25, dated 15 May 2002.

3. Increase the Category A - Rejected Takeoff Distance, the Category A-Landing Distance, and the Category B - Landing Distance, as stated in the current Rotorcraft Flight Manual (RFM) for the helicopter, by multiplying these rejected takeoff and landing distances by a factor of 1.67. This can be accomplished by inserting into the helicopter flight manual a copy of this Directive, or the helicopter manufacturers temporary revision to the RFM reflecting increased rejected takeoff and landing distances.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE