Commonwealth legislation

AD/BELL 47/100 - Stabiliser Bar Damper Link Assembly

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This directive requires owners/operators of the listed Bell 47 helicopter variants to remove each stabiliser-bar damper link, fit a specified safety-washer kit (P/N CA-047-96-022-1) and reinstall the link per Bell Alert Service Bulletin 47-96-22. Compliance is mandatory within 100 flight hours after 16 July 1998 or by 16 November 1998. The measure responds to reports that damper-link bushings can loosen and fall out, which can allow link separation and reduce control effectiveness.

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AD/BELL 47/100 - Stabiliser Bar Damper Link Assembly

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 47 (All Variants) Series Helicopters

AD/BELL 47/100 Stabiliser Bar Damper Link Assembly 8/98

Applicability: Model 47B, 47B-3, 47D, 47D-1, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47H-1, 47J,

47J-2, 47J-2A, and 47K helicopters.

Requirement: Remove the stabiliser bar damper link assemblies from the helicopter, install a safety washer kit, part number CA-047-96-022-1, and reinstall the stabiliser bar damper link assemblies onto the helicopter in accordance with Accomplishment Instructions in Bell Helicopter Textron, Inc. Alert Service Bulletin 47-96-22, dated 16 August 1996.

Note: FAA AD 98-07-09 Amdt 39-10429 refers.

Compliance: Unless already accomplished, within 100 hours time in service after 16 July 1998 or before 16 November 1998, whichever occurs first.

This airworthiness directive becomes effective on 16 July 1998.

Background: The FAA received two reports of incidents in which the bushings loosened and exited the damper link rod ends, allowing the damper link to slide over the retention bolt and separate from the stabiliser bar (in the first incident), and from the hydraulic damper (in the second incident). Failure of the damper link assembly could result in degraded control response and subsequent loss of control of the helicopter.

Source text

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

1 AD/BELL 47/100 - Stabiliser Bar Damper Link Assembly