488 

14 CFR Ch. I (1–1–19 Edition) 

§ 135.371 

airplane at a weight, allowing for nor-
mal consumption of fuel and oil, that 
does not allow a rate of climb (in feet 
per minute), with all engines oper-
ating, of at least 6.90 Vs

o

(that is, the 

number of feet per minute obtained by 
multiplying the number of knots by 
6.90) at an altitude of a least 1,000 feet 
above the highest ground or obstruc-
tion within ten miles of each side of 
the intended track. 

(b) This section does not apply to 

large transport category airplanes cer-
tificated under part 4a of the Civil Air 
Regulations. 

§ 135.371

Large transport category air-

planes: Reciprocating engine pow-
ered: En route limitations: One en-
gine inoperative. 

(a) Except as provided in paragraph 

(b) of this section, no person operating 
a reciprocating engine powered large 
transport category airplane may take 
off that airplane at a weight, allowing 
for normal consumption of fuel and oil, 
that does not allow a rate of climb (in 
feet per minute), with one engine inop-
erative, of at least (0.079

¥

0.106/N) Vs

o

2 

(where N is the number of engines in-
stalled and Vs

o

is expressed in knots) 

at an altitude of least 1,000 feet above 
the highest ground or obstruction 
within 10 miles of each side of the in-
tended track. However, for the pur-
poses of this paragraph the rate of 
climb for transport category airplanes 
certificated under part 4a of the Civil 
Air Regulations is 0.026 Vs

o

2. 

(b) In place of the requirements of 

paragraph (a) of this section, a person 
may, under an approved procedure, op-
erate a reciprocating engine powered 
large transport category airplane at an 
all-engines-operating altitude that al-
lows the airplane to continue, after an 
engine failure, to an alternate airport 
where a landing can be made under 
§ 135.377, allowing for normal consump-
tion of fuel and oil. After the assumed 
failure, the flight path must clear the 
ground and any obstruction within five 
miles on each side of the intended 
track by at least 2,000 feet. 

(c) If an approved procedure under 

paragraph (b) of this section is used, 
the certificate holder shall comply 
with the following: 

(1) The rate of climb (as prescribed in 

the Airplane Flight Manual for the ap-
propriate weight and altitude) used in 
calculating the airplane’s flight path 
shall be diminished by an amount in 
feet per minute, equal to (0.079

¥

0.106/ 

N) Vs

o

2 (when N is the number of en-

gines installed and Vs

o

is expressed in 

knots) for airplanes certificated under 
part 25 of this chapter and by 0.026 Vs

o

2 

for airplanes certificated under part 4a 
of the Civil Air Regulations. 

(2) The all-engines-operating altitude 

shall be sufficient so that in the event 
the critical engine becomes inoperative 
at any point along the route, the flight 
will be able to proceed to a predeter-
mined alternate airport by use of this 
procedure. In determining the takeoff 
weight, the airplane is assumed to pass 
over the critical obstruction following 
engine failure at a point no closer to 
the critical obstruction than the near-
est approved navigational fix, unless 
the Administrator approves a proce-
dure established on a different basis 
upon finding that adequate operational 
safeguards exist. 

(3) The airplane must meet the provi-

sions of paragraph (a) of this section at 
1,000 feet above the airport used as an 
alternate in this procedure. 

(4) The procedure must include an ap-

proved method of accounting for winds 
and temperatures that would otherwise 
adversely affect the flight path. 

(5) In complying with this procedure, 

fuel jettisoning is allowed if the certifi-
cate holder shows that it has an ade-
quate training program, that proper in-
structions are given to the flight crew, 
and all other precautions are taken to 
ensure a safe procedure. 

(6) The certificate holder and the 

pilot in command shall jointly elect an 
alternate airport for which the appro-
priate weather reports or forecasts, or 
any combination of them, indicate that 
weather conditions will be at or above 
the alternate weather minimum speci-
fied in the certificate holder’s oper-
ations specifications for that airport 
when the flight arrives. 

[Doc. No. 16097, 43 FR 46783, Oct. 10, 1978, as 
amended by Amdt. 135–110, 72 FR 31685, June 
7, 2007] 

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