Airworthiness Directive · Amendment 39-17017 · Engine
Sikorsky Aircraft Corporation Helicopters
This AD applies to Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters, certificated in any category.
We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD was prompted by the manufacturer's analysis of engine data that revealed the data was inaccurate in dealing with available above specification engine power margin. This AD requires revising the Operating Limitations section of the Sikorsky Model S-92A Rotorcraft Flight Manual (RFM). The actions are intended to prevent the use of inaccurate engine performance data in calculating maximum gross weight by revising the Operating Limitations section of the RFM.
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) By making pen and ink changes, insert into the Operating Limitations section, Part 1, Section 1, Weight Limits, of Rotorcraft Flight Manuals (RFMs) SA S92A-RFM-002, -003, -004, -005, and -006 the following limitation “Performance credit for above specification engine power margin is prohibited.”
(2) If the RFM already contains the revisions appropriate for your helicopter as listed in the following Table 1, all dated April 9, 2008, with the correct performance charts, without the performance credit as depicted in the circled area of Figure 1 of this AD, the operating limitation required by paragraph (1) of this AD does not need to be inserted into the RFM.
| Affected RFM | Revision with correct charts |
|---|---|
| S92A-RFM-002 | Revision 8. |
| S92A-RFM-003 | Revision 7. |
| S92A-RFM-004 | Revision 6. |
| S92A-RFM-005 | Revision 5. |
| S92A-RFM-006 | Revision 6. |
Note to paragraph (e)(2) of this AD: Previous RFM revisions allowed for the use of above-specification engine power margin as depicted in the circled area of Figure 1 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
