Commonwealth legislation

AD/R22/34 - Suspect Bolts

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This AD requires owners/operators of certain Robinson R22 helicopters to carry out Robinson Service Bulletin No. 69—inspect and, if needed, replace suspect NAS1304‑16 AF tail‑rotor bolts—within the short compliance window (10 hours TIS or the specified calendar cutoff). It applies to SN 1880–2060 and 2073 and R22s overhauled or maintained by RHC or in locations using the suspect bolts since 9 July 1991.

Issued after a hydrogen‑embrittlement bolt failure, it aims to prevent catastrophic in‑flight failure; operators bear the cost, scheduling and record‑checking burden.

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AD/R22/34 - Suspect Bolts

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Robinson R22 Series Helicopters

AD/R22/34 Suspect Bolts 5/92 DM

Applicability: Model R22 with serial numbers 1880 through 2060, and 2073. Also any R22 which has been overhauled or repaired by RHC since 9 July 1991 and all R22 regardless of serial number for which maintenance was performed since 9 July 1991 in the locations where the suspect bolts may have been used.

Requirement: Action in accordance with Robinson SB No 69.

Note: FAA Telex AD 92-06-17 refers.

Compliance: Within 10 hours time in service after 26 March 1992 or by 9 April 1992, whichever occurs first.

Background: A Robinson Helicopter experienced a failure of an NAS1304-16 AF bolt installed in the tail rotor controls of an R22 helicopter. Examination indicated the bolt failed due to hydrogen embrittlement which occurred during cadmium plating. In-flight failure of this bolt could be catastrophic.

Source text

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

1 AD/R22/34 - Suspect Bolts