Airworthiness directives › 2007-05-51
AD 2007-05-51 Airworthiness Directives; MD Helicopters Inc. (MDHI) Model MD600N Helicopters
Models named: MD600N. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Model MD600N helicopters, with a lateral mixer output link assembly (mixer link), part number (P/N) 600N7636-1, -3, -9, or -11 installed, certificated in any category.
Compliance
Required as indicated, unless accomplished previously. To detect a crack in the mixer link, which could result in failure of the mixer link and subsequent loss of control of the helicopter, accomplish the following: (a) Before further flight: (1) Remove each mixer link and visually inspect, with a bright light and a 10x or higher magnifying glass, the shaded areas around the bearing bore for any crack as depicted in the following Figure 1: ER20AP07.003 (2) Perform an eddy current inspection of each mixer link in the bearing end areas. (3) Replace any cracked mixer link with an airworthy mixer link on which an eddy current inspection has been performed. Note: MDHI Service Bulletin No. SB600N-044, dated February 16, 2007, pertains to the subject of this AD. (b) Perform an eddy current inspection on each mixer link before installing it on any helicopter. (c) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Contact the Manager, Los Angeles Aircraft Certification Office, FAA, ATTN: Jon Mowery, Aviation Safety Engineer, Airframe Branch, 3960 Paramount Blvd., Lakewood, California 90712, telephone (562) 627-5322, fax (562) 627-5210, for information about previously approved alternative methods of compliance. (d) A one-time special flight permit may be issued in accordance with 14 CFR 21.197 and 21.199 to operate the helicopter to a location where the eddy current inspection requirements of this AD can be accomplished provided that no crack is found during the visual inspection required in paragraph (a) of this AD and that the helicopter's airspeed does not exceed 100 knots. (e) This amendment becomes effective on May 7, 2007, to all persons except those persons to whom it was made immediately effective by Emergency AD 2007-05-51, issued February 17, 2007, which contained the requirements of this amendment. Issued in Fort Worth, Texas, on April 5, 2007. Mark R. Schilling, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. E7-7438 Filed 4-19-07; 8:45 am] BILLING CODE 4910-13-P
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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