Airworthiness directives › 2004-06-04
AD 2004-06-04 Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76 A, B, and C Helicopters
Models named: S-76 A, B, C. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Model S-76 A, B, and C helicopters, with a dual channel autopilot and with dual inverters installed, certificated in any category. Note: The following serial-numbered helicopters were manufactured with the dual channel autopilots and dual inverters installed: S-76 A Serial Numbers: 760267, 760268, 760270 through 760298, 760300 through 760302, 760304 through 760309, 760364, 760366, 760369 through 760371, 760373 through 760378; S-76 B Serial Numbers: 760262, 760269, 760299, 760303, 760310 through 760363, 760365, 760367, 760368, 760372, 760379 through 760382, 760387, 760391, 760393, 760395, 760399, 760403, 760404, 760409, 760410, 760413, 760414, 760416, 760425, 760427 through 760430, 762976 (760433), 760437, 760439, 760441 through 760445, 760447 through 760452, 760454, 760455, 760458, 760462, 760465, and 760507; and S-76 C Serial Numbers: 760383 through 760386, 760388 through 760390, 760392, 760394, 760396 through 760398, 760400 through 760402, 760405 through 760408, 760411, 760412, 760415, 760417 through 760424, 760426, 760431, 760432, 760434 through 760436, 760438, 760440, 760446, 760453, 760456, 760457, 760459 through 760461, 760463, 760464, 760466 through 760506, and 760508 through 760526.
Compliance
Required as indicated, unless accomplished previously. To prevent both autopilots from disengaging following a No. 2 DC generator failure, and subsequent loss of control of the helicopter during instrument meteorological conditions (IMC) flight, do the following: (a) Before further flight: (1) Determine if the No. 1 inverter is wired to the DC essential bus by following the Accomplishment Instructions, paragraph 3.B. of Sikorsky Aircraft Corporation Alert Service Bulletin No. 76-24-14A, Revision A, dated October 9, 2003 (ASB). (2) If the No. 1 inverter is wired to the DC essential bus, and the wiring modification is not accomplished as described in paragraph (b) of this AD, then before further flight, install a placard near the airspeed indicator that contains the limitation “Maximum IMC Airspeed 120 KIAS” and annotate this airspeed limitation in the Operating Limitation section of the Rotorcraft Flight Manual (RFM). (b) Within 30 days, for those helicopters with the No.1 inverter wired to the DC essential bus, modify the electrical wiring so that the No.1 inverter, which powers the co-pilot's Automatic Flight Control System (AFCS) computer, is wired to the No. 2 DC primary bus and the No. 2 inverter, which powers the pilot's AFCS computer, is wired to the DC essential bus by following the Accomplishment Instructions, paragraph 3.C. of the ASB. (c) After modifying the electrical wiring as required in paragraph (b) of this AD, remove the placard and RFM annotation. (d) 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 Boston Aircraft Certification Office, Engine and Propeller Directorate, FAA, for information about previously approved alternative methods of compliance. (e) The test, modification, revision and placard installation shall be done in accordance with Sikorsky Aircraft Corporation Alert Service Bulletin No. 76-24-14A, Revision A, dated October 9, 2003. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Sikorsky Aircraft Corporation, Attn: Manager, Commercial Tech Support, 6900 Main Street, Stratford, Connecticut 06614, phone (203) 386-3001, fax (203) 386-5983. Copies may be inspected at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on April 15, 2004. Issued in Fort Worth, Texas, on March 10, 2004. Scott A. Horn, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 04-6777 Filed 3-30-04; 8:45 am] BILLING CODE 4910-13-P
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