Contingency Power

[Rich Lee]

Can anyone assist with an orignal source document, or military or civil regulation that defines the term "Contingency Power" as relates turbine engine operation in twin engine helicopters?

[Gregg]

The FAA rejected use of the term "contingency power" a few years ago.
The US Army defines it as OEI 2.5 min power in ADS-40A. I think that it may be an official term in Europe, but don't have access to those pubs right now.

[Rich Lee]

Thank you for your post Greg. Unfortunately ADS-40A does not provide historical footnotes. I am looking for a source document; something that might contain the logic or thought process by which it came to be. Have you run across anything like that?

[Matthew Parsons]

Rich, I did find some reference in the UK Def Stan 00-970 (the section on powerplants) to Contingency power, but it was sporadic and didn't have full definitions. However, there are obsolete versions at the website as well. I haven't checked them, but if that standard suffices you might be able to find a definition.

[Rich Lee]

Thank you Matthew. I will see if I can find an original copy of UK Def Stan 00-970. I hadn't expected the search for the origin of this term of art to be so difficult.

[Genghis the Engineer]

Thank you Matthew. I will see if I can find an original copy of UK Def Stan 00-970. I hadn't expected the search for the origin of this term of art to be so difficult.

http://www.dstan.mod.uk/

G

[No_7DAD]

The FAA has approved a contingency power rating. The S-76C+ Type Design incorporates a feature to allow both engines to exceed normal power rating based on collective application rate and/or Nr decay. The power rating was published as a Special Condition in the Federal Register prior to the Amended Type Design approval.
Questions? [email protected]

[asmccuk]

Concorde engines had contingency ratings and I think the TSS certification regulations had relevant definitions. However I do not know where you might find a set of TSS now.
asmccuk