98 

14 CFR Ch. I (1–1–24 Edition) 

§ 121.175 

navigation facilities furnish reliable 
and accurate identification of high 
ground and obstructions located out-
side of five miles, but within ten miles, 
on each side of the intended track. 

[Doc. No. 6258, 29 FR 19198, Dec. 31, 1964, as 
amended by Amdt. 121–251, 60 FR 65928, Dec. 
20, 1995] 

§ 121.175 Airplanes: Reciprocating en-

gine-powered: Weight limitations. 

(a) No person may take off a recipro-

cating engine powered airplane from an 
airport located at an elevation outside 
of the range for which maximum take-
off weights have been determined for 
that airplane. 

(b) No person may take off a recipro-

cating engine powered airplane for an 
airport of intended destination that is 
located at an elevation outside of the 
range for which maximum landing 
weights have been determined for that 
airplane. 

(c) No person may specify, or have 

specified, an alternate airport that is 
located at an elevation outside of the 
range for which maximum landing 
weights have been determined for the 
reciprocating engine powered airplane 
concerned. 

(d) No person may take off a recipro-

cating engine powered airplane at a 
weight more than the maximum au-
thorized takeoff weight for the ele-
vation of the airport. 

(e) No person may take off a recipro-

cating engine powered airplane if its 
weight on arrival at the airport of des-
tination will be more than the max-
imum authorized landing weight for 
the elevation of that airport, allowing 
for normal consumption of fuel and oil 
en route. 

(f) This section does not apply to 

large nontransport category airplanes 
operated under § 121.173(c). 

[Doc. No. 6258, 29 FR 19198, Dec. 31, 1964, as 
amended by Amdt. 121–251, 60 FR 65928, Dec. 
20, 1995] 

§ 121.177 Airplanes: Reciprocating en-

gine-powered: Takeoff limitations. 

(a) No person operating a recipro-

cating engine powered airplane may 
takeoff that airplane unless it is pos-
sible— 

(1) To stop the airplane safely on the 

runway, as shown by the accelerate 

stop distance data, at any time during 
takeoff until reaching critical-engine 
failure speed; 

(2) If the critical engine fails at any 

time after the airplane reaches crit-
ical-engine failure speed 

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1

, to con-

tinue the takeoff and reach a height of 
50 feet, as indicated by the takeoff path 
data, before passing over the end of the 
runway; and 

(3) To clear all obstacles either by at 

least 50 feet vertically (as shown by the 
takeoff path data) or 200 feet hori-
zontally within the airport boundaries 
and 300 feet horizontally beyond the 
boundaries, without banking before 
reaching a height of 50 feet (as shown 
by the takeoff path data) and there-
after without banking more than 15 de-
grees. 

(b) In applying this section, correc-

tions must be made for the effective 
runway gradient. To allow for wind ef-
fect, takeoff data based on still air may 
be corrected by taking into account 
not more than 50 percent of any re-
ported headwind component and not 
less than 150 percent of any reported 
tailwind component. 

(c) This section does not apply to 

large nontransport category airplanes 
operated under § 121.173(c). 

[Doc. No. 6258, 29 FR 19198, Dec. 31, 1964, as 
amended by Amdt. 121–159, 45 FR 41593, June 
19, 1980; Amdt. 121–251, 60 FR 65928, Dec. 20, 
1995] 

§ 121.179 Airplanes: Reciprocating en-

gine-powered: En route limitations: 
All engines operating. 

(a) No person operating a recipro-

cating engine powered airplane may 
take off that airplane at a weight, al-
lowing for normal consumption of fuel 
and oil, that does not allow a rate of 
climb (in feet per minute), with all en-
gines operating, of at least 6.90 

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So

 

(that is, the number of feet per minute 
is obtained by multiplying the number 
of knots by 6.90) at an altitude of at 
least 1,000 feet above the highest 
ground or obstruction within ten miles 
of each side of the intended track. 

(b) This section does not apply to air-

planes certificated under part 4a of the 
Civil Air Regulations.