Commonwealth legislation

AD/BELL 47/99 - Tail Rotor Blade Skin Material

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

Requires operators of Bell 47 helicopters fitted with tail rotor blade assembly P/N 047-642-117-105, S/N A-1943–A-2068, to follow Bell Helicopter ASB 47‑96‑21 immediately and at every daily inspection or every 10 flight hours. It mandates inspections and corrective action to address incorrectly skinned blades that can separate and shed components; replacing blades with approved part numbers terminates the directive. Operators pay for inspections, repairs and any blade replacement.

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AD/BELL 47/99 - Tail Rotor Blade Skin Material

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 47/99 Tail Rotor Blade Skin Material 5/96

Applicability: All models with tail rotor blade assembly P/N 047-642-117-105, S/Nos A-1943 to A-2068 inclusive, installed.

Requirement: Action in accordance with BHTI ASB 47-96-21.

Note 1. FAA AD 96-06-12 refers.

Note 2. Installation of approved tail rotor blades, other than those specified in the Applicability, terminates this Directive.

Note 3. Installation of tail rotor blades P/N 047-642-117-105M including those serial numbers specified in the Applicability terminates this Directive.

Compliance: Prior to further flight after 22 March 1996, thereafter at each Daily Inspection, or at intervals not exceeding 10 hours time in service, whichever occurs first.

Note: The Compliance of this Directive is at variance with that of the Requirement Document.

Background: The helicopter manufacturer has discovered that certain serial number tail rotor blades were skinned with the incorrect material. This may cause bond line separation and possible loss of the abrasion strip and/or blade tip block.

Source text

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

1 AD/BELL 47/99 - Tail Rotor Blade Skin Material