Airworthiness Directive · Amendment 39-18683 · Fire bottle, fixed
Sikorsky Aircraft Corporation Helicopters
This AD applies to Model S-92A helicopters, serial number 920006 through 920250, certificated in any category.
We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD requires altering the fire bottle inertia switch wiring and performing a cartridge functional test of the fire extinguishing system. This AD was prompted by the inadvertent tripping of inertia-switches that has led to unintentional discharging of the fire bottles, leaving the helicopter's auxiliary power unit and engines without fire protection. The actions are intended to prevent unintentional and undetected fire bottle discharges and subsequent unavailability of fire suppression in case of a fire.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
Within 90 days:
(1) Alter each fire bottle inertia switch by following the Accomplishment Instructions, paragraph 3.B., of Sikorsky Alert Service Bulletin 92-26-005A, Revision A, dated June 27, 2014.
(2) Perform a cartridge functional test.
Compliance with Sikorsky Alert Service Bulletin 92-26-005, Basic Issue, dated June 18, 2014, before the effective date of this AD is considered acceptable for compliance with the actions specified in paragraph (e) of this AD.
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
