Airworthiness Directive · Amendment 39-17598 · Extinguishing system
Sikorsky Aircraft Corporation Helicopters
This AD applies to Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters, serial numbers 920006 through 920169, certificated in any category.
We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters to require modifying the No. 1 engine forward firewall center fire extinguisher discharge tube (No. 1 engine tube) and inspecting the outboard discharge tube to determine if it is correctly positioned. This AD was prompted by the discovery that the No. 1 engine tube installed on the helicopters is too long to ensure that a fire could be effectively extinguished in the helicopter. The actions are intended to ensure the No. 1 engine tube allows for complete coverage of an extinguishing agent in the No. 1 engine compartment area, ensure that a fire would be extinguished and prevent the loss of helicopter control.
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 120 days:
(1) Modify the No. 1 engine forward firewall center discharge tube in accordance with the Accomplishment Instructions, Paragraph B, of Sikorsky Alert Service Bulletin 92-26-004, dated June 4, 2012 (ASB).
(2) Inspect the outboard discharge tube and determine if it is correctly positioned as depicted in Figure 3 of the ASB. If it is not correctly positioned, correct the positioning in accordance with the Accomplishment Instructions, Paragraph D, of the ASB.
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
