Commonwealth legislation

AD/R44/15 - Sprag Clutch

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive requires owners/operators of specified Robinson R44 helicopters to inspect sprag clutches and replace any clutch with the listed serial numbers using Robinson service-bulletin procedures, and to remove a pilot caution page from the flight manual. CASA issued the directive after reports of cracked sprag ends to prevent possible clutch failure and loss of main rotor RPM; owners/operators must carry out and pay for the work within the stated compliance period.

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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 issues the following Airworthiness Directive (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/R44/15 Sprag Clutch 7/2000

Applicability: Model R44 helicopters serial number 0001 through 0541 inclusive, 0543, 0550, 0556

and 0565.

Requirement: 1. Examine sprag clutch for S/N applicability. Replace any sprag clutch with S/N 0003 through 0505 inclusive in accordance with the procedures detailed in Robinson R44 Service Bulletin SB-32 Part B paragraph 1 to 5 inclusive.

Note 1: Robinson R44 SB-36 expands affected clutch S/N range to include S/Nos 0453 through 0505.

Remove the pink page Special Pilot Caution covering autorotation with a possible defective sprag clutch from the Normal Procedures Section of the R44 flight manual.

Note 2: FAA AD 2000-08-04 Amendment 39-11690 and FAA AD 99-07-18 refers

Compliance: 1. Unless previously carried out, within 30 calendar days or 50 hours time in service, whichever occurs first, from the effective date of this Directive.

Upon accomplishment of Requirement 1.

This Airworthiness Directive becomes effective on 13 July 2000.

View image in the official sourceBackground: Robinson Helicopter Co has advised that several sprag clutches, one from an accident aircraft, have been returned with cracked sprag ends. To prevent sprag clutch failure with possible loss of main rotor RPM this Directive mandates replacement of the sprag clutch assembly.

View image in the official source

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 23 May 2000

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

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 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.