Commonwealth legislation

AD/BN-2/61 Amdt 1 - Main Landing Gear Attachment Bolts

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legislative instrument

Plain English Summary

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Requires operators of Pilatus Britten‑Norman BN‑2 series aeroplanes (BN‑2, BN‑2A, BN‑2B and BN‑2T) to carry out the work set out in Mandatory Service Bulletin BN‑2/SB.231 Issue 2 so the bolts that attach the main landing‑gear lower fitting to the nacelle are fitted/adjusted to avoid thread binding. Compliance is required within 50 landings after 21 May 1998. The measure is intended to prevent play at the lower fitting that can cause cracks in the nacelle box structure, and the cost and work fall to aircraft owners/operators and their maintenance organisations.

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AD/BN-2/61 Amdt 1 - Main Landing Gear Attachment Bolts

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Pilatus Britten-Norman BN-2 Series Aeroplanes

AD/BN-2/61

Amdt 1

Main Landing Gear Attachment Bolts 6/98

Applicability: Model BN-2, BN-2A, and BN-2B Series and BN-2T Islanders.

Requirement: Action in accordance with Pilatus Britten-Norman Mandatory Service Bulletin BN- 2/SB.231 Issue 2.

Note: UK CAA AD 008-10-96 refers.

Compliance: Unless already accomplished, within 50 landings after 21 May 1998.

This amendment becomes effective on 21 May 1998.

Background: The action required by this Directive is to ensure that the bolts that attach the lower fitting of the main landing gear to the nacelle do not become thread bound. Due to skin thickness tolerances, bolts with only one washer installed can cause play to occur at the MLG bottom fitting. If play occurs in this area, it can cause cracks in the nacelle box structure.

Amendment 1 is issued in response to Issue 2 of the Requirement document.

The original issue of this airworthiness directive became effective on 24 April 1997.

Source text

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

1 AD/BN-2/61 Amdt 1 - Main Landing Gear Attachment Bolts