Airworthiness Directive · Amendment 39-14618 · Sikorsky Aircraft Corporation Model S-92A Helicopters
Sikorsky Aircraft Corporation Model S-92A Helicopters
Model S-92A helicopters, with main transmission mounting bolt (bolt), part number (P/N) SS5211-10-47, installed, certificated in any category.
This amendment adopts a new airworthiness directive (AD) for the specified Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This action requires inspecting each main transmission assembly mounting bolt (bolt) for wear or corrosion, and if wear or corrosion is found, replacing the bolt, bolt barrel nut, and cage. This amendment is prompted by a report of a failure of a bolt that was discovered during a routine maintenance inspection. The actions specified in this AD are intended to prevent failure of a bolt, which could result in loss of support of the main transmission and subsequent loss of control of the helicopter.
Required as indicated.
To prevent failure of a bolt, which could result in loss of support of the main transmission and subsequent loss of control of the helicopter, accomplish the following:
(a) Within 100 hours time-in-service (TIS), unless accomplished within the last 500 hours TIS, open the No. 1 and No. 2 engine work platforms to gain access to the 8 bolts. Remove each bolt, one at a time, and visually inspect the bolt shank and threads for wear or corrosion in accordance with paragraphs 3.A.(6)(a) of the Accomplishment Instructions in Sikorsky Aircraft Corporation Alert Service Bulletin No. 92-63-003, dated February 1, 2006 (ASB). Reporting the condition of the mounting bolt, tagging the mounting bolt with location, and sending the removed mounting bolt and barrel nut to Sikorsky Aircraft Corporation are not required to satisfy the requirements of this AD.
(b) Before further flight, replace any bolt on which wear or corrosion is found, as well as the bolt barrel nut and cage, with an airworthy bolt, P/N SS5211-10-47, barrel nut, P/N RMLH2577-108, and cage, P/N NAS578-10B.
(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, Boston Aircraft Certification Office, Engine and Propeller Directorate, FAA, ATTN: Wayne Gaulzetti, Aviation Safety Engineer, 12 New England Executive Park, Burlington, MA 01803, telephone (781) 238-7156, fax (781) 238-7170, for information about previously approved alternative methods of compliance.
(d) The inspections shall be done in accordance with the specified paragraphs of Sikorsky Aircraft Corporation Alert Service Bulletin No. 92-63-003, dated February 1, 2006. The Director of the Federal Register approved this incorporation by reference 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 National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
(e) This amendment becomes effective on June 15, 2006.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
