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AD/B747/62 Amdt 3 - Flap Carriage Spindles and Aft Link Assembly
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Boeing 747 Series Aeroplanes
| AD/B747/62 Amdt 3 | Flap Carriage Spindles and Aft Link Assembly | 1/2009 |
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| Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, and 747SR series aircraft. |
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| Requirement: | Action in accordance with the technical requirements of FAA AD 2008-22-17 Amdt 39-15714. |
| Compliance: | As specified in the Requirement document, with a revised effective date of15 January 2009. |
| This Amendment becomes effective on 15 January 2009. | |
| Background: | In an overseas incident, undetected stress corrosion caused failure of two spindles on one flap which resulted in severe handling difficulties. Fractured flap carriage aft links have also been detected overseas.Amendment 1 referenced Revision 2 of the Requirement document which requires inspection and overhaul of aft link assemblies, additional inspections, revised compliance intervals and requirement to overhaul or replace spindles.Amendment 2 required additional work, i.e. internal inspection of the spindles. It also referenced the superseding FAA AD as the Requirement document due to the requirement and compliance diverging from Boeing Service Bulletin 747-27-2280 Revision 3.Amendment 3 is issued in response to a new FAA AD, which adds a repetitive inspection to detect broken parts, and revises the overhaul threshold and repetitive intervals. The FAA AD results from analysis that showed additional inspections should be done to prevent the loss of a flap, and that the flight-hour-based interval should be revised to a flight-cycle-based interval, because the greatest loads on the spindles happen during takeoff and landing. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
27 November 2008