101 

Federal Aviation Administration, DOT 

§ 121.191 

§ 121.189 Airplanes: Turbine engine 

powered: Takeoff limitations. 

(a) No person operating a turbine en-

gine powered airplane may take off 
that airplane at a weight greater than 
that listed in the Airplane Flight Man-
ual for the elevation of the airport and 
for the ambient temperature existing 
at takeoff. 

(b) No person operating a turbine en-

gine powered airplane certificated after 
August 26, 1957, but before August 30, 
1959 (SR422, 422A), may take off that 
airplane at a weight greater than that 
listed in the Airplane Flight Manual 
for the minimum distances required for 
takeoff. In the case of an airplane cer-
tificated after September 30, 1958 
(SR422A, 422B), the takeoff distance 
may include a clearway distance but 
the clearway distance included may 
not be greater than 

1

⁄

2

of the takeoff 

run. 

(c) No person operating a turbine en-

gine powered airplane certificated after 
August 29, 1959 (SR422B), may take off 
that airplane at a weight greater than 
that listed in the Airplane Flight Man-
ual at which compliance with the fol-
lowing may be shown: 

(1) The accelerate-stop distance must 

not exceed the length of the runway 
plus the length of any stopway. 

(2) The takeoff distance must not ex-

ceed the length of the runway plus the 
length of any clearway except that the 
length of any clearway included must 
not be greater than one-half the length 
of the runway. 

(3) The takeoff run must not be 

greater than the length of the runway. 

(d) No person operating a turbine en-

gine powered airplane may take off 
that airplane at a weight greater than 
that listed in the Airplane Flight Man-
ual— 

(1) In the case of an airplane certifi-

cated after August 26, 1957, but before 
October 1, 1958 (SR422), that allows a 
takeoff path that clears all obstacles 
either by at least (35 + 0.01D) feet 
vertically (D is the distance along the 
intended flight path from the end of 
the runway in feet), or by at least 200 
feet horizontally within the airport 
boundaries and by at least 300 feet 
horizontally after passing the bound-
aries; or 

(2) In the case of an airplane certifi-

cated after September 30, 1958 (SR 
422A, 422B), that allows a net takeoff 
flight path that clears all obstacles ei-
ther by a height of at least 35 feet 
vertically, or by at least 200 feet hori-
zontally within the airport boundaries 
and by at least 300 feet horizontally 
after passing the boundaries. 

(e) In determining maximum 

weights, minimum distances, and flight 
paths under paragraphs (a) through (d) 
of this section, correction must be 
made for the runway to be used, the 
elevation of the airport, the effective 
runway gradient, the ambient tempera-
ture and wind component at the time 
of takeoff, and, if operating limitations 
exist for the minimum distances re-
quired for takeoff from wet runways, 
the runway surface condition (dry or 
wet). Wet runway distances associated 
with grooved or porous friction course 
runways, if provided in the Airplane 
Flight Manual, may be used only for 
runways that are grooved or treated 
with a porous friction course (PFC) 
overlay, and that the operator deter-
mines are designed, constructed, and 
maintained in a manner acceptable to 
the Administrator. 

(f) For the purposes of this section, it 

is assumed that the airplane is not 
banked before reaching a height of 50 
feet, as shown by the takeoff path or 
net takeoff flight path data (as appro-
priate) in the Airplane Flight Manual, 
and thereafter that the maximum bank 
is not more than 15 degrees. 

(g) For the purposes of this section 

the terms, 

takeoff distance, takeoff run, 

net takeoff flight path 

and 

takeoff path 

have the same meanings as set forth in 
the rules under which the airplane was 
certificated. 

[Doc. No. 6258, 29 FR 19198, Dec. 31, 1964, as 
amended by Amdt. 121–268, 63 FR 8321, Feb. 
18, 1998] 

§ 121.191 Airplanes: Turbine engine 

powered: En route limitations: One 

engine inoperative. 

(a) No person operating a turbine en-

gine powered airplane may take off 
that airplane at a weight, allowing for 
normal consumption of fuel and oil, 
that is greater than that which (under 
the approved, one engine inoperative, 
en route net flight path data in the