Airworthiness directives › 2024-20-05
AD 2024-20-05 Airworthiness Directives; Columbia Helicopters, Inc., and Restricted Category Model CH-47D Helicopters
Models named: 234, CH-47D. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the helicopters identified in paragraphs (c)(1) and (2) of this AD with a flight control rigid connecting link (link) part number (P/N) 145C3340-10 having manufacturing CAGE code 59213, a link P/N 145C3340-10 having an unknown manufacturing CAGE code, a link with an unknown P/N having manufacturing CAGE code 59213, or a link with an unknown P/N and unknown manufacturing CAGE code, installed. (1) Columbia Helicopters, Inc., Model 234 helicopters, certificated in any category; and (2) Restricted category Model CH-47D helicopters; current type certificate holders include, but are not limited to, Billings Flying Service, Inc., Columbia Helicopters, Inc, Tandem Rotor, LLC, and Unical Air Inc. Note 1 to paragraph (c): A flight control rigid connecting link is also referred to as a rigid connecting link in related material. Note 2 to paragraph (c): The P/N and manufacturing CAGE code information may be located on the tube of the link assembly. Information about the location of the P/N and manufacturing CAGE code is available in Boeing Service Bulletin CH-47, No. 145-67-1047, dated May 22, 2024.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 5 days after the effective date of this AD, remove the link from service and replace it with an airworthy link.
Unsafe condition
This AD was prompted by two reports of a link failure, due to a manufacturing defect. The FAA is issuing this AD to address non-conforming links. The unsafe condition, if not addressed, could result in a link failure within the flight control system due to fatigue and subsequent immediate loss of control of the helicopter.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1