Airworthiness directives › 2008-22-52
AD 2008-22-52 Airworthiness Directives; MD Helicopters, Inc. Model 500N and 600N Helicopters
Models named: 500N, 600N. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Model 500N and 600N helicopters, with a Yaw Stability Augmentation System (YSAS) adapter tube, part number 500N7218-1, installed, certificated in any category. Adapter tubes that have a production date code stamp are not included in the applicability of this AD.
Compliance
Required as indicated, unless accomplished previously. To prevent loss of yaw control and subsequent loss of control of the helicopter, do the following: (a) Before further flight: (1) Turn OFF the YSAS switch. (2) Install a placard on the instrument panel as close as practicable to the airspeed indicator that states: “YSAS SYSTEM IS OFF. AIRSPEED LIMIT 100 KIAS or V NE , WHICHEVER IS LESS.” Note: MDHI Service Bulletin SB500N-040R1/SB600N-047R1, dated August 27, 2008, and maintenance manual CSP-HMI-3, Section 96-00-00, pertain to the subject of this AD. (3) Make pen and ink changes or place a copy of this AD in the limitations section of the rotorcraft flight manual (RFM) to revise the limitations as follows: “V NE is limited to 100 KIAS or less as determined by referring to the airspeed V NE placard already installed on the helicopter.” (b) Within 45 days, replace each affected adapter tube with an airworthy adapter tube that has a production date code stamp. This replacement is terminating action for the requirements of this AD. Once this replacement has been done, remove the placards, remove the airspeed restriction revisions that were made to the RFM, and return the YSAS system to its normal position. (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: Eric D. Schrieber, Aviation Safety Engineer, Airframe Branch, 3960 Paramount Blvd., Lakewood, California 90712, telephone 562-627-5348, fax 562-627-5210, for information about previously approved alternative methods of compliance. (d) Copies of the applicable service information may be obtained from MD Helicopters Inc., Attn: Customer Support Division, 4555 E. McDowell Rd., Mail Stop M615, Mesa, Arizona 85215-9734, telephone 1-800-388-3378, fax 480-346-6813, or on the Web at http://www.mdhelicopters.com. (e) This amendment becomes effective on December 15, 2008, to all persons except those persons to whom it was made immediately effective by Emergency AD 2008-22-52, issued October 23, 2008, which contained the requirements of this amendment. Issued in Fort Worth, Texas, on November 14, 2008. Scott A. Horn, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. E8-28110 Filed 11-26-08; 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