Thu, Mar 23, 2006
Applicability: Model BK 117, BK117A-3,
BK117A-4, BK117B-1, BK117B-2, and BK117C-1 helicopters.
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 Model KHI-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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