Commonwealth legislation

AD/S-76/65 Amdt 4 - Main Rotor Shaft

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Commonwealth

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legislative instrument

Plain English Summary

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This directive requires operators of Sikorsky S‑76A/B/C helicopters fitted with main rotor shafts P/N 76351‑09030 or 76351‑09630 to follow Sikorsky ASB 76‑66‑32: specific serial‑numbered shafts must be removed from service and others must undergo recurring fluorescent penetrant inspections at 20 flight‑hour or 80‑flight intervals, with some shafts to be replaced before next flight after 18 Jan 2001. CASA enforces compliance. The action responds to reported cracked shafts from a particular manufacturing lot and shifts inspection and replacement costs and operational downtime to operators.

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AD/S-76/65 Amdt 4 - Main Rotor Shaft

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
View image in the official source
Sikorsky S-76 Series Helicopters

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/S-76/65 Amdt 3 and issues the following AD under subregulation 39.1 (1) of CAR 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.

AD/S-76/65

Amdt 4

Main Rotor Shaft 3/2001

Applicability: Model S-76A, S-76B, and S-76C helicopters, with main rotor shaft assembly part number 76351-09030 series or 76351-09630 series installed.

Requirement: Action in accordance with the Accomplishment Instructions of Sikorsky Aircraft Corporation Alert Service Bulletin (ASB) 76-66-32.

Note 1: The fluorescent penetrant inspection specified in the Requirement document is not the fluorescent penetrant inspection contained in paragraph 4 of Chapter 20- 05-00 of the applicable maintenance manual.

Note 2: FAA Emergency AD 2001-03-51 refers.

Compliance: 1. Main Gear Box Assemblies containing a listed serial number 76351-09030-044 main rotor shaft specified in the Requirement document, are to be replaced before further flight after 18 January 2001, unless already accomplished.

2. Main Gear Box Assemblies containing a listed serial number 76351-09630-041 main rotor shaft specified in the Requirement document, with less than 1,000 hours time in service , are to continue the recurring Fluorescent Penetrant Inspection (FPI) previously required by ASB 76-66-31 Revision B. The FPI is to be accomplished every 20 flight hours or every 80 flights, whichever occurs first. A take-off and landing constitutes one flight. This interval begins after the last previously conducted FPI in accordance with ASB 76-66-31 Revision B.

Note 3: The daily 10x visual inspection is no longer required for these main gear box assemblies.

3. Main Gear Box Assemblies containing a listed serial number 76351-09630-041 main rotor shaft specified in the Requirement document, with more than 1,000 hours time in service, are to be replaced before further flight after 18 January 2001.

This amendment becomes effective on 22 March 2001.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Background: The FAA received a report of a cracked main rotor shaft assembly, found during an inspection of the main transmission oil seal. The shaft had accrued 477 hours time in service when the crack was found. A cracked main rotor shaft assembly could result in failure of the shaft assembly and subsequent loss of control of the helicopter.

Amendment 1 required repeat visual and NDI inspections. Additionally, the FAA has determined that certain shafts must be removed from service because the three cracked shafts discovered so far came from the same manufacturing lot.

Amendment 2 was a re-issue of amendment 1 due to a gazette administration issue.

Amendment 3 introduced the latest revision of the Requirement document which isolated certain main rotor shafts for further inspection and replacement.

Amendment 4 is issued to reference the related FAA AD.

Amendment 3 of this Airworthiness Directive became effective on 18 January 2001.

Amendment 1 of this Airworthiness Directive became effective on 13 November 2000.

The original issue of this Airworthiness Directive became effective on 7 November 2000.

Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority

David Alan Villiers

Delegate of the Civil Aviation Safety Authority 9 February 2001

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 21 February 2001.

Source text

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

1 AD/S-76/65 Amdt 4 - Main Rotor Shaft

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Sikorsky S-76 Series Helicopters

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/S-76/65 Amdt 3 and issues the following AD under subregulation 39.1 (1) of CAR 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.

AD/S-76/65

Amdt 4

Main Rotor Shaft 3/2001

Applicability: Model S-76A, S-76B, and S-76C helicopters, with main rotor shaft assembly part number 76351-09030 series or 76351-09630 series installed.

Requirement: Action in accordance with the Accomplishment Instructions of Sikorsky Aircraft Corporation Alert Service Bulletin (ASB) 76-66-32.

Note 2: FAA Emergency AD 2001-03-51 refers.

2. Main Gear Box Assemblies containing a listed serial number 76351-09630-041 main rotor shaft specified in the Requirement document, with less than 1,000 hours time in service , are to continue the recurring Fluorescent Penetrant Inspection (FPI) previously required by ASB 76-66-31 Revision B. The FPI is to be accomplished every 20 flight hours or every 80 flights, whichever occurs first. A take-off and landing constitutes one flight. This interval begins after the last previously conducted FPI in accordance with ASB 76-66-31 Revision B.

Note 3: The daily 10x visual inspection is no longer required for these main gear box assemblies.