PPRuNe Forums - View Single Post - Sikorsky S-92: From Design to Operations
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Old 26th Feb 2003, 22:50
  #140 (permalink)  
Nick Lappos
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Flight Safety is right on, the S-92 was certified to amendment 45, dated Oct 1999, while the EH-101 was certified to amendment 27, dated in 1990. The difference in that 9 years is striking.

About 1/3 of the regulations had changed in the meantime, including all those relating to the safety aspects that were mentioned in the Collier Award Citation. The flaw tolerance, bird strike, critical parts, crashworthiness and other items were all instituted after the EH was certified.

It should be mentioned that the manufacturer gets to select the certification basis when the original application is made, so the EH, when certified in 1994, met the regulations that were in effect in 1990. This "Grandfathering" is commonly done to freeze the design at an older basis to assure faster compliance. With the S-92, we applied for a certification basis in the FUTURE to capture the draft regulations. This meant that we reached ahead to capture those safety aspects.

Similarly, the S-92 is the only large helicopter to apply for JAR certification, and will shortly work with the JAR test community to get that done. Unless the JAA website (dated 5 Feb 2003) is wrong, dangermouse need not fume because the EH-101 is NOT on the JAR list for certification projects.

Here are the websites to check my homework:

JAR Projects:
http://www.jaa.nl/secured/Certificat...Rotorcraft.pdf

Type data Sheets for certification basis:
http://www.airweb.faa.gov/Regulatory...e?OpenFrameSet

Historical FAR for dates of amendments:
http://www.airweb.faa.gov/Regulatory...pand=5.28#5.28