PERFORMANCE
AIRPLANE
FLIGHT
5-01 ANAC APPROVED
Page 14 code 01 REVISION 6
ENGINE RATINGS
CRITICAL ENGINE
It is the engine whose failure would most adversely affect the
performance or handling qualities of the airplane.
TAKEOFF THRUST
It is the maximum thrust available for takeoff, usually time limited.
NORMAL TAKEOFF THRUST - NTO
It is the maximum thrust available for the all-engine-operating takeoff,
or for the one-engine-inoperative takeoff when ATTCS is not used. It is
usually time limited.
AUTOMATIC TAKEOFF THRUST CONTROL SYSTEM - ATTCS
It is the system that increases the Normal Takeoff Thrust on the live
engine to Reserved Takeoff Thrust, when the other engine fails. It is
designed for saving engine life, since most of takeoffs do not suffer
engine failure, thus allowing use of Normal Takeoff Thrust in every all-
engine-operating takeoff. ATTCS is also used to increase the Normal
Go-Around Thrust on the live engine to Maximum Go-Around Thrust,
when the other engine fails.
DERATED TAKEOFF THRUST
It is a takeoff thrust level less than the maximum takeoff thrust, which
is considered by the CAFM as an independent and clearly
distinguished takeoff thrust rating that complies with all takeoff
performance requirements. When operating with derated takeoff
thrust, the takeoff thrust setting parameter that is presented by the
CAFM is considered a normal takeoff operating limit. It is usually time
limited.
REDUCED TAKEOFF THRUST
It is a takeoff thrust level less than the maximum takeoff thrust, or less
than the derated takeoff thrust. When operating with reduced takeoff
thrust, the takeoff thrust setting parameter that is presented by the
CAFM is not considered a takeoff operating limit. It is usually time
limited.
GO-AROUND THRUST
It is the maximum thrust available for go-around, usually time limited.
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