605 

Federal Aviation Administration, DOT 

Pt. 25, App. I 

I25.3

Performance and System Reliability Re-

quirements. 

The applicant must comply with the per-

formance and ATTCS reliability require-
ments as follows: 

(a) An ATTCS failure or a combination of 

failures in the ATTCS during the critical 
time interval: 

(1) Shall not prevent the insertion of the 

maximum approved takeoff thrust or power, or 
must be shown to be an improbable event. 

(2) Shall not result in a significant loss or 

reduction in thrust or power, or must be 
shown to be an extremely improbable event. 

(b) The concurrent existence of an ATTCS 

failure and an engine failure during the crit-
ical time interval must be shown to be ex-
tremely improbable. 

(c) All applicable performance require-

ments of Part 25 must be met with an engine 
failure occurring at the most critical point 

during takeoff with the ATTCS system func-
tioning. 

I25.4

Thrust Setting. 

The initial takeoff thrust or power setting 

on each engine at the beginning of the take-
off roll may not be less than any of the fol-
lowing: 

(a) Ninety (90) percent of the thrust or 

power set by the ATTCS (the maximum 
takeoff thrust or power approved for the air-
plane under existing ambient conditions); 

(b) That required to permit normal oper-

ation of all safety-related systems and equip-
ment dependent upon engine thrust or power 
lever position; or 

(c) That shown to be free of hazardous en-

gine response characteristics when thrust or 
power is advanced from the initial takeoff 
thrust or power to the maximum approved 
takeoff thrust or power. 

I25.5

Powerplant Controls. 

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