782 

14 CFR Ch. I (1–1–19 Edition) 

§ 91.611 

(iii) Operations from airports where 

the runways may require a takeoff or 
approach over populated areas; and 

(iv) Inspection procedures for deter-

mining the operating condition of the 
operative engines. 

(4) No person may take off an air-

plane under this section if— 

(i) The initial climb is over thickly 

populated areas; or 

(ii) Weather conditions at the takeoff 

or destination airport are less than 
those required for VFR flight. 

(5) Persons other than required flight 

crewmembers shall not be carried dur-
ing the flight. 

(6) No person may use a flight crew-

member for flight under this section 
unless that crewmember is thoroughly 
familiar with the operating procedures 
for one-engine inoperative ferry flight 
contained in the certificate holder’s 
manual and the limitations and per-
formance information in the Airplane 
Flight Manual. 

(b) 

Flight tests: reciprocating-engine- 

powered airplanes. 

The airplane per-

formance of a reciprocating-engine- 
powered airplane with one engine inop-
erative must be determined by flight 
test as follows: 

(1) A speed not less than 1.3 V

S1

must 

be chosen at which the airplane may be 
controlled satisfactorily in a climb 
with the critical engine inoperative 
(with its propeller removed or in a con-
figuration desired by the operator and 
with all other engines operating at the 
maximum power determined in para-
graph (b)(3) of this section. 

(2) The distance required to accel-

erate to the speed listed in paragraph 
(b)(1) of this section and to climb to 50 
feet must be determined with— 

(i) The landing gear extended; 
(ii) The critical engine inoperative 

and its propeller removed or in a con-
figuration desired by the operator; and 

(iii) The other engines operating at 

not more than maximum power estab-
lished under paragraph (b)(3) of this 
section. 

(3) The takeoff, flight and landing 

procedures, such as the approximate 
trim settings, method of power applica-
tion, maximum power, and speed must 
be established. 

(4) The performance must be deter-

mined at a maximum weight not great-

er than the weight that allows a rate of 
climb of at least 400 feet per minute in 
the en route configuration set forth in 
§ 25.67(d) of this chapter in effect on 
January 31, 1977, at an altitude of 5,000 
feet. 

(5) The performance must be deter-

mined using temperature account-
ability for the takeoff field length, 
computed in accordance with § 25.61 of 
this chapter in effect on January 31, 
1977. 

(c) 

Flight tests: Turbine-engine-powered 

airplanes. 

The airplane performance of 

a turbine-engine-powered airplane with 
one engine inoperative must be deter-
mined by flight tests, including at 
least three takeoff tests, in accordance 
with the following: 

(1) Takeoff speeds V

R

and V

2

, not less 

than the corresponding speeds under 
which the airplane was type certifi-
cated under § 25.107 of this chapter, 
must be chosen at which the airplane 
may be controlled satisfactorily with 
the critical engine inoperative (with 
its propeller removed or in a configura-
tion desired by the operator, if applica-
ble) and with all other engines oper-
ating at not more than the power se-
lected for type certification as set 
forth in § 25.101 of this chapter. 

(2) The minimum takeoff field length 

must be the horizontal distance re-
quired to accelerate and climb to the 
35-foot height at V

2

speed (including 

any additional speed increment ob-
tained in the tests) multiplied by 115 
percent and determined with— 

(i) The landing gear extended; 
(ii) The critical engine inoperative 

and its propeller removed or in a con-
figuration desired by the operator (if 
applicable); and 

(iii) The other engine operating at 

not more than the power selected for 
type certification as set forth in § 25.101 
of this chapter. 

(3) The takeoff, flight, and landing 

procedures such as the approximate 
trim setting, method of power applica-
tion, maximum power, and speed must 
be established. The airplane must be 
satisfactorily controllable during the 
entire takeoff run when operated ac-
cording to these procedures. 

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