AD Number: Kawasaki BK 117
Series Helicopters AD/JBK 117/23 Main Rotor Blades with Bolted Lead
Inner Weights 7/2005 DM Applicability: Model BK117, BK117 A-3, BK117 A-4,
BK117 B-1, BK117 B-2, and BK117 C-1 helicopters. Requirement: Action in accordance with Kawasaki
Service Bulletins KSB-117-248 and KSB-117-248-1, or later JCAB
approved revisions. Note: JCAB AD No. TCD-6590-2005 refers. Compliance: As specified in the Requirement
documents. Unless it has already been accomplished, the 4 week
period for the log check begins on 6 May 2005.
This Airworthiness Directive becomes effective on 6 May 2005.
Background: A report was received of the
in-flight occurrence of severe vibrations on a BK117 helicopter.
The pilot immediately performed a safe landing. The initial
inspection revealed a cracked-open main rotor blade trailing edge.
A subsequent inspection by the manufacturer revealed that a part of
a bolted lead inner weight had come loose. This Directive
introduces a life limit for blades with bolted lead inner weights