Commonwealth legislation

AD/BELL 206/103 - Tension/Torsion Strap Fitting

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

A mandatory safety inspection for Bell 206B III helicopters fitted with tension/torsion strap fitting P/N 206-011-150-101 requires checking that the fitting’s center (smallest) flat is aligned with the static stop. If assembled on the wrong flat the rotor blade twists the wrong way, preventing full collective in an engine-out emergency and risking a crash. Inspect within 100 flight hours after Aug 31, 1986 and each time the assembly is disassembled; continue until replaced by P/N 206-011-150-105.

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Current sections

Direct links to the current provisions in AD/BELL 206/103 - Tension/Torsion Strap Fitting.

AD/BELL 206/103 - Tension/Torsion Strap Fitting

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters

AD/BELL 206/103 Tension/Torsion Strap Fitting 8/86

Applicability: All Bell 206B III Series Helicopters fitted with tension/torsion strap sleeve fitting P/No. 206-011-150-101.

Requirement: For aircraft which have had the tension/torsion strap assembly disassembled since new, inspect the strap fitting (P/No 206-011- 150-101) to static stop (P/N. 206-011- 121-103) alignment. The strap fitting (P/No. 206-011-150-101) has 3 flats adjacent to each other: the centre and smallest is the correct flat for mating with the static stop.

Note: With the blade grip in the zero pitch position, the wrong flat aligns with the stop, thus positioning the T/T strap so that it increases twist with pitch increase instead of vice versa.

Compliance: Inspect within 100 hours time in service after 31 August 1986 and thereafter anytime the tension/torsion strap assembly is disassembled until P/No. 206-011-150-101 fitting is replaced with P/No. 206-011-150-105 fitting.

Background: If the strap fitting P/NO. 206-011-150-101 is refitted incorrectly and should the aircraft suffer an engine failure, full collective pitch cannot be achieved.

The strap fitting P/No. 206-011-150-101 is fitted by the manufacturer and is not available as a replacement part: P/No. 206-011-150-105 is supplied. The problem does not occur when the latter Part Number is fitted.

Source text

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

1 AD/BELL 206/103 - Tension/Torsion Strap Fitting