Commonwealth legislation

AD/R44/6 - Main Rotor Gearbox

In ForceCTH

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Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Owners/operators of Robinson R44 helicopters S/N 0001–0232 fitted with main rotor gearbox P/N C006‑1 (rev A–P) must carry out the inspection/rectification in Robinson Service Bulletin No. 15 within 100 flight hours from 11 Sep 1996 or by 1 Oct 1996. The AD follows an overseas in‑flight gearbox failure linked to loose ring‑gear bolts; findings of fretting or loose bolts must be reported via mandatory defect reporting. Costs and downtime fall to owners/operators.

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AD/R44/6 - Main Rotor Gearbox

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Robinson R44 Series Helicopters

AD/R44/6 Main Rotor Gearbox 12/96 DM

Applicability: This Directive is applicable to all R44 helicopters with S/N 0001 through 0232 fitted with main rotor gearbox P/N C006-1 Revision A through P. Helicopters S/N 0019, 0067, 0118, 0135 and 0215 are already in compliance with this Directive.

Requirement: Unless previously carried out, action in accordance with Robinson R44 SB No 15 dated 2 August 1996. Report any fretting or loose bolts by MDR action.

Note: FAA Priority Letter AD 96-18-22 refers.

Compliance: Within 100 hours time in service from 11 September 1996 or prior to 1 October 1996, whichever occurs first.

Background: An overseas inflight failure of a main rotor gearbox has been reported. Inspection of the gearbox revealed that the 18 bolts securing the ring gear, P/N C146-3, to the gear carrier, P/N C268-2, had lost clamping torque which then resulted in fretting and failure of the gear carrier.

Source text

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

1 AD/R44/6 - Main Rotor Gearbox