Commonwealth legislation

AD/BELL 212/35 - Tail Rotor Trunnion Bearing Housing

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

5/10 complexity

This directive requires owners/operators and maintenance organisations of specified Bell 212 serial-number helicopters to carry out the manufacturer’s Bell Alert Service Bulletin inspections and corrective actions: a short‑interval recurring inspection regimen until a mandated final corrective action is completed within the stated time window. It was issued because undersize tail‑rotor trunnion housings risk vibration and loss of control. Compliance is mandatory, imposing inspection, repair costs and aircraft downtime on affected operators.

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Current sections

Direct links to the current provisions in AD/BELL 212/35 - Tail Rotor Trunnion Bearing Housing.

AD/BELL 212/35 - Tail Rotor Trunnion Bearing Housing

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Bell Helicopter Textron 212 Series Helicopters

AD/BELL 212/35 Tail Rotor Trunnion Bearing Housing 9/86

Applicability: All model 212 S/N: 30501 to 30999 31101 to 31273 and 31275 32101 to 32142

32201 to 32262.

Requirement: Action in accordance with Bell Alert Service Bulletin No. 212-86-39, Revision A.

Compliance: Part I of the Requirement Document: Within 25 hours time in service or seven days whichever occurs first after 6 August 1986 and thereafter at intervals not exceeding 25 hours time in service or 7 days, whichever occurs first, until Part II is complied with.

Part II of the Requirement Document: Within 150 hours time in service or 60 days whichever occurs first after 31 July 1986.

Background: A trunnion bearing housing end web has been found below specified dimensions.

Failure of the housing caused excessive tail rotor vibration and loss of control.

Source text

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

1 AD/BELL 212/35 - Tail Rotor Trunnion Bearing Housing