Airworthiness Directive · Amendment 39-21203 · Rotor drive indicating system
Sikorsky Aircraft Corporation Helicopters
This AD applies to Sikorsky Aircraft Corporation Model S-92A helicopters, serial number (S/N) 920006 through 920304 inclusive and S/N 920311 through 920314 inclusive, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD was prompted by two incidents of erroneous low oil pressure caution cockpit indications and unintended actuation of the main gearbox (MGB) auto bypass valve. This AD requires installing auxiliary circuit breaker modification (MOD) kits and inserting a Rotorcraft Flight Manual (RFM) Supplement into the existing RFM for your helicopter. The FAA is issuing this AD to address the unsafe condition on these products.
Within 400 hours time-in-service:
(1) For helicopters S/N 920006 through 920296 inclusive:
(i) Install Modification (MOD) Kit Clips and Brackets part number (P/N) 92070-20115-015 by following the Instructions, paragraph B. of Sikorsky Special Service Instructions No. 92-121, dated October 26, 2017 (SSI 92-121).
(ii) Install the first portion of MOD Kit Auxiliary Circuit Breaker Panel P/N 92070-55075-011 by following the Instructions, paragraph C. of Sikorsky SSI 92-121.
(iii) Install MOD Kit Left Hand (LH) Cockpit Auxiliary Power Unit P/N 92070-55096-012 by following the Instructions, paragraph D. of Sikorsky SSI 92-121.
(iv) Install MOD Kit LH Cabin Auxiliary Power Unit P/N 92070-55096-013 by following the Instructions, paragraph E. of Sikorsky SSI 92-121.
(v) Install MOD Kit LH Top Deck FLD P/N 92070-55096-016 by following the Instructions, paragraph F. of Sikorsky SSI 92-121.
(vi) Install MOD Kit MGB XMSN P/N 92070-55096-017 by following the Instructions, paragraph G. of Sikorsky SSI 92-121.
(vii) Install the completion portion of MOD Kit Auxiliary Circuit Break Panel P/N 92070-55075-011 by following the Instructions, paragraph H. of Sikorsky SSI 92-121.
(viii) Install MOD Kit Auxiliary Cabin Panel Faceplate P/N 92070-55075-012 by following the Instructions, paragraph J. of Sikorsky SSI 92-121.
(2) For helicopters S/N 920297 through 920304 inclusive and S/N 920311 through 920314 inclusive:
(i) Modify the auxiliary circuit breaker panel and transmission harness by following the Instructions, paragraph I. of Sikorsky SSI 92-121.
(ii) Install MOD Kit Auxiliary Cabin Panel Faceplate P/N 92070-55075-012 by following the Instructions, paragraph J. of Sikorsky SSI 92-121.
(3) Insert a copy of the Rotorcraft Flight Manual (RFM) Supplement No. 45, Revision No. 2, Sikorsky Model S-92A, Part 1, dated April 27, 2017, into the existing RFM for your helicopter.
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
