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Certification of the Sikorsky S-92A™ Helicopter to the EASA Limited Icing Special Condition
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 13, 2011 by SAE International in United States
Annotation ability available
Sikorsky Aircraft certificated the Model S-92A™ helicopter for flight in icing conditions in 2005. Since that time, the aircraft has flown in icing conditions throughout the world and the approval to launch a flight when icing conditions are forecast or reported has been valuable to operators. However, when the rotor ice protection system was inoperative due to a system failure, use of the aircraft on days of forecast icing was prohibited. Sikorsky Aircraft, therefore, elected to obtain certification of the S-92A helicopter to an EASA limited icing Special Condition so that UK and Norwegian operators in the North Sea sector could complete a mission when icing conditions were forecast, should the RIPS be inoperative on that day. A review of previously available icing data indicated that the S-92A helicopter could meet the requirements of the EASA Special Condition, but that additional flights were required to demonstrate full compliance. The S-92A demonstrated compliance with the Special Condition for ambient temperatures equal to or greater than -5°C, liquid water content equal to or below 0.5 g/m₃, and pressure altitudes equal to or below 8,000 feet. The S-92A helicopter is now allowed to operate with RIPS inoperative in known or forecast icing in the North Sea sector within these conditions.
|Technical Paper||Sikorsky S-92A® and S-76D™ Helicopter Rotor Ice Protection Systems|
|Technical Paper||Tropospheric Airborne Meteorological Data Reporting (TAMDAR) Sensor Development|
|Technical Paper||EXTICE: EXTreme Icing Environement|
CitationFlemming, R. and Alldridge, P., "Certification of the Sikorsky S-92A™ Helicopter to the EASA Limited Icing Special Condition," SAE Technical Paper 2011-38-0006, 2011, https://doi.org/10.4271/2011-38-0006.
- “Title 14 of the Code of Federal Regulations, Part 29: Airworthiness Standards, Transport Category Rotorcraft,” (date consistent with amendment and certification basis).
- “Certification of Transport Category Rotorcraft,” Federal Aviation Administration Advisory Circular 29-2C, September 30, 1999.
- “Advisory Material for Helicopter Limited Icing Clearances,” CAA Paper 96006.
- “Flight in Ice-forming Conditions and Snow,” BCAR Paper No G610.