New proposed FAA Airworthiness Directive:
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Safety.
The Proposed Amendment
Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding a new airworthiness directive to read as follows:
Sikorsky Aircraft Corporation: Docket No. FAA-2010-0720; Directorate Identifier 2010-SW-050-AD.
Applicability: Model S-92A helicopters, with main gearbox housing, part number 92351-15110-042, -043, -044, or -045, installed, certificated in any category.
Compliance: Required as indicated, unless done previously.
To prevent failure of the main gearbox housing mounting foot pad, loss of the main gearbox, and subsequent loss of control of the helicopter, do the following:
(a) Within 60 days, revise the airworthiness limitations section of the Instructions for Continued Airworthiness by reducing the life limits of the affected main gearbox housing from 2700 hours time-in- service (TIS) to 1000 hours TIS.
(b) After revising the life limit in accordance with paragraph (a) of this AD, before further flight, replace any main gearbox housing that exceeds the life limit of 1000 hours TIS.
(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, FAA, Attn: Michael Schwetz, Aviation Safety Engineer, 12 New England Executive Park, Burlington, MA 01803, telephone (781) 238-7761, fax (781) 238-7170, for information about previously approved alternative methods of compliance.
(d) The Joint Aircraft System/Component (JASC) Code is 6320: Main Rotor Gearbox.