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Derated Thrust  
User currently offlineSkystar From Australia, joined Jan 2000, 1363 posts, RR: 2
Posted (15 years 8 months 6 days 4 hours ago) and read 1261 times:

I was wondering at the other airlines, what is the maximum derate used? (ASMD Temp).

At Ansett, 60°C is used on the B762. That is about 95N1 at 15°C.



4 replies: All unread, jump to last
User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 1, posted (15 years 8 months 4 days 17 hours ago) and read 1174 times:

I believe the FAR's/CAR's/CAA etc specify minimum derates. Our company 757's (RB211) use data supplied by Jeppesen and for the most part, the highest assumed temperature allowed is in the 60-62C range. The maximum assumed tends to decrease with ambient temperatures lower than 20C.

Just a thumbnail explanation!

Best Regards,


User currently offlineCX flyboy From Hong Kong, joined Dec 1999, 6811 posts, RR: 55
Reply 2, posted (15 years 8 months 4 days 13 hours ago) and read 1144 times:

We can use 60 degrees as well in Cathay on the 747-400.

The Hong Kong Civil Aviation Department restricts derates to not more than 25% of fully rated thrust. This is why airlines, including ours quite often has engines derated in the certification process (Done by altering the computer programming in the aircraft), so that we can have a bigger derate, and in the long run save money.

User currently offlineAFa340-300E From France, joined May 1999, 2084 posts, RR: 25
Reply 3, posted (15 years 7 months 3 weeks 6 days 4 hours ago) and read 1105 times:


What is meant is the temperature below the normal at the end of the turbine. Is that is?

Thank you,

Best regards,
Alain Mengus

User currently offlineAAR90 From United States of America, joined Jan 2000, 3589 posts, RR: 44
Reply 4, posted (15 years 7 months 3 weeks 6 days ago) and read 1098 times:

Last I knew AA 767s=60C max assumed temp (AT) and 757s=62C AT.
MD90s=60C AT on virtually all flights.

*NO CARRIER* -- A Naval Aviator's worst nightmare!
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