AD/BN-2/51 Amdt 3 - Main Landing Gear Upper Torque Link Attachment Lug (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BN-2/51 Amdt 2 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Pilatus Britten-Norman BN-2 Series Aeroplanes

AD/BN-2/51 Amdt 3

Main Landing Gear Upper Torque Link Attachment Lug

10/2002

Applicability: All BN2, BN2A, BN2B, and BN2T Series Islander aircraft.

Requirement: 1. Inspect in accordance with FHL Service Bulletin 32-4 Issue 5, Revision 2, dated 15 June 2002.

2. Replace Main Undercarriage Assembly Part Number 3499H1 with Assembly Part Number 3499H2, in accordance with FHL Service Bulletin (SB) 32-4 Issue 5, SB 32-4 Issue 5 Revision 1, or SB 32-4 Issue 5 Revision 2.

Note: B-N Group Ltd Mandatory Service Bulletin SB 170 Issue 6 refers.

Compliance: 1. As specified in the Requirement document.

2. Within 1,000 landings after 9 January 2002, or before 30 September 2002, whichever occurs first.

The compliance times remain unchanged by this issue. This Amendment becomes effe ctive on 3 October 2002. Background: There have been occurrences of main leg cylinders exhibiting fatigue cracks at the torque link lugs, which could result in detachment of the torque links under subsequent heavy static loads. In addition, a recent occurrence of detachment of the torque link showed no such evidence of cracking prior to failure under heavy static load.