Airworthiness directives › 2013-20-18
AD 2013-20-18 Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
Applicability*9
This AD supersedes AD 2009-05-09, Amendment 39-15833 (74 FR 11001, March 16, 2009).
Compliance
Within 10 hours time-in-service (TIS): (1) Review the helicopter records to determine all of the helicopter models on which an affected yoke has been installed since its production and the hours TIS of each affected yoke. (2) If an affected part-numbered yoke has ever been installed on a Model 412CF helicopter or on a Model 412 or 412EP helicopter with a slope landing kit, P/N 412-704-012-101, installed, do the following: (i) Reidentify the P/N on the side of the yoke by using a vibrating stylus and etching two lines through the last three digits of the existing P/N and etching “137FM” adjacent to where you etched through the last three digits of the original P/N. This converts each affected yoke P/N to a new yoke P/N 412-010-101-137FM. The serial number remains the same. Note 1 to paragraph (f)(2)(i) of this AD: The “FM” P/N suffix denotes a field-modified part. (ii) Treat the etched surface with chemical film, and apply primer and paint. (iii) Record the reidentified P/N on the applicable component history card or equivalent record. (3) If you cannot determine all the model helicopters on which an affected yoke has been installed since its production or whether it has ever been installed on a Model 412 or 412EP helicopter with a slope landing kit, P/N 412-704-012-101, installed, perform the actions required by paragraphs (f)(2)(i) through (f)(2)(iii) of this AD. (4) For each reidentified yoke, P/N 412-010-101-137FM, reduce the retirement life from 5,000 hours TIS to 4,500 hours TIS. Record the revised life limit on the applicable component history card or equivalent record. (5) Revise the Airworthiness Limitations section of the applicable maintenance manual or the Instructions for Continued Airworthiness by reducing the retirement life from 5,000 hours TIS to 4,500 hours TIS for each reidentified yoke, P/N 412-010-101-137FM.
Required actions
Special flight permits will not be issued.
Unsafe condition
You are responsible for performing each action required by this AD within the specified compliance time, unless it has been accomplished previously.
Affected ADs
This AD defines the unsafe condition as fatigue cracking of a yoke, failure of the yoke, and subsequent loss of control of the helicopter.
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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