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AD/JBK 117/10 Amdt 3 - Tail Boom Vertical Fin Spar
Kawasaki BK 117 Series HelicoptersKawasaki BK 117 Series Helicopters
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Kawasaki BK 117 Series Helicopters
| AD/JBK 117/10 Amdt 3 | Tail Boom Vertical Fin Spar | 5/2006 DM |
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| Applicability: | Model BK 117, BK117A-3, BK117A-4, BK117B-1, BK117B-2, and BK117C-1 helicopters. |
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| Requirement: | 1. Revise the KHI-BK117 Maintenance Manual to Revision No. 14 (or later approved revision) for Models KHI-BK 117, BK117A-3, BK117A-4, BK117B-1, BK117B-2, and Revision No. 2 (or later approved revision) for ModelKHI-BK117C-1.2. Perform the inspections detailed in KSB-117-129C in accordance with the inspection interval and method specified in the KHI-BK117 Maintenance Manual, revised by Requirement 1.If the inspection results exceed the allowable limit specified in the KHI-BK117 Maintenance Manual, before further flight, contact KHI Customer Service for technical advice.Note 1: Kawasaki Service Bulletin No. KSB-117-129C refers.Note 2: JCAB AD TCD-4605B-2006 refers. |
| Compliance: | Initially, before further flight after 28 March 2006. Thereafter as specified in Requirement 2. |
| This Amendment becomes effective on 28 March 2006. | |
| Background: | A report was received of a fatal accident overseas where investigation revealed that the tail boom vertical fin had failed as a result of a fatigue crack that initiated on the left side of the vertical fin spar cap, and propagated across the cap and the web.Amendment 1 required a reinforcement modification, while still requiring a repetitive inspection at increased periodicity.Amendment 2 introduced the latest revision of the Requirement document which revised the modification procedures. |
| Amendment 3 is issued in response to a new JCAB AD, which transfers the inspection requirements of this Directive to the KHI-BK117 Maintenance Manual.The original issue of this Airworthiness Directive became effective on 9 May 1997. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
23 March 2006