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14 CFR Ch. I (1–1–19 Edition) 

Pt. 25, App. J 

during takeoff with the ATTCS system func-


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-

(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. 


Powerplant Controls. 

(a) In addition to the requirements of 

§ 25.1141, no single failure or malfunction, or 
probable combination thereof, of the ATTCS, 
including associated systems, may cause the 
failure of any powerplant function necessary 
for safety. 

(b) The ATTCS must be designed to: 
(1) Apply thrust or power on the operating 

engine(s), following any one engine failure 
during takeoff, to achieve the maximum ap-
proved takeoff thrust or power without ex-
ceeding engine operating limits; 

(2) Permit manual decrease or increase in 

thrust or power up to the maximum takeoff 
thrust or power approved for the airplane 
under existing conditions through the use of 
the power lever. For airplanes equipped with 
limiters that automatically prevent engine 
operating limits from being exceeded under 
existing ambient conditions, other means 
may be used to increase the thrust or power 
in the event of an ATTCS failure provided 
the means is located on or forward of the 
power levers; is easily identified and oper-
ated under all operating conditions by a sin-
gle action of either pilot with the hand that 
is normally used to actuate the power levers; 
and meets the requirements of § 25.777 (a), 
(b), and (c); 

(3) Provide a means to verify to the 

flightcrew before takeoff that the ATTCS is 
in a condition to operate; and 

(4) Provide a means for the flightcrew to 

deactivate the automatic function. This 
means must be designed to prevent inad-
vertent deactivation. 


Powerplant Instruments. 

In addition to the requirements of § 25.1305: 
(a) A means must be provided to indicate 

when the ATTCS is in the armed or ready 
condition; and 

(b) If the inherent flight characteristics of 

the airplane do not provide adequate warn-
ing that an engine has failed, a warning sys-

tem that is independent of the ATTCS must 
be provided to give the pilot a clear warning 
of any engine failure during takeoff. 

[Amdt. 25–62, 52 FR 43156, Nov. 9, 1987] 












The following test criteria and procedures 

must be used for showing compliance with 
§ 25.803: 

(a) The emergency evacuation must be con-

ducted with exterior ambient light levels of 
no greater than 0.3 foot-candles prior to the 
activation of the airplane emergency light-
ing system. The source(s) of the initial exte-
rior ambient light level may remain active 
or illuminated during the actual demonstra-
tion. There must, however, be no increase in 
the exterior ambient light level except for 
that due to activation of the airplane emer-
gency lighting system. 

(b) The airplane must be in a normal atti-

tude with landing gear extended. 

(c) Unless the airplane is equipped with an 

off-wing descent means, stands or ramps may 
be used for descent from the wing to the 
ground. Safety equipment such as mats or 
inverted life rafts may be placed on the floor 
or ground to protect participants. No other 
equipment that is not part of the emergency 
evacuation equipment of the airplane may be 
used to aid the participants in reaching the 

(d) Except as provided in paragraph (a) of 

this appendix, only the airplane’s emergency 
lighting system may provide illumination. 

(e) All emergency equipment required for 

the planned operation of the airplane must 
be installed. 

(f) Each internal door or curtain must be 

in the takeoff configuration. 

(g) Each crewmember must be seated in 

the normally assigned seat for takeoff and 
must remain in the seat until receiving the 
signal for commencement of the demonstra-
tion. Each crewmember must be a person 
having knowledge of the operation of exits 
and emergency equipment and, if compliance 
with § 121.291 is also being demonstrated, 
each flight attendant must be a member of a 
regularly scheduled line crew. 

(h) A representative passenger load of per-

sons in normal health must be used as fol-

(1) At least 40 percent of the passenger load 

must be female. 

(2) At least 35 percent of the passenger load 

must be over 50 years of age. 

(3) At least 15 percent of the passenger load 

must be female and over 50 years of age. 

(4) Three life-size dolls, not included as 

part of the total passenger load, must be car-
ried by passengers to simulate live infants 2 
years old or younger. 

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