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14 CFR Ch. I (1–1–19 Edition)

§ 121.175

after taking into account the tempera-
ture operating correction factors in the
applicable Airplane Flight Manual.

(f) The Administrator may authorize

in the operations specifications devi-
ations from the requirements in the
subpart if special circumstances make
a literal observance of a requirement
unnecessary for safety.

(g) The ten-mile width specified in

§§ 121.179 through 121.183 may be re-
duced to five miles, for not more than
20 miles, when operating VFR or where
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.

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

, 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.

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

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