---
kind: "range"
citation: "14 C.F.R. §§ 135.365–135.377"
title: "14"
from: "135.365"
to: "135.377"
count: 7
url: "https://uscodex.org/cfr/14/135.365..135.377"
---

# §135.365. Large transport category airplanes: Reciprocating engine powered: Weight limitations.

- (a) No person may take off a reciprocating engine powered large transport category airplane from an airport located at an elevation outside of the range for which maximum takeoff weights have been determined for that airplane.
- (b) No person may take off a reciprocating engine powered large transport category 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 large transport category airplane concerned.
- (d) No person may take off a reciprocating engine powered large transport category airplane at a weight more than the maximum authorized takeoff weight for the elevation of the airport.
- (e) No person may take off a reciprocating engine powered large transport category airplane if its weight on arrival at the airport of destination will be more than the maximum authorized landing weight for the elevation of that airport, allowing for normal consumption of fuel and oil en route.

# §135.367. Large transport category airplanes: Reciprocating engine powered: Takeoff limitations.

- (a) No person operating a reciprocating engine powered large transport category airplane may take off that airplane unless it is possible—
  - (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 critical-engine failure speed V1, to continue 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 horizontally 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 after that without banking more than 15 degrees.
- (b) In applying this section, corrections must be made for any runway gradient. To allow for wind effect, takeoff data based on still air may be corrected by taking into account not more than 50 percent of any reported headwind component and not less than 150 percent of any reported tailwind component.

# §135.369. Large transport category airplanes: Reciprocating engine powered: En route limitations: All engines operating.

- (a) 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 all engines operating, of at least 6.90 Vso (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 obstruction within ten miles of each side of the intended track.
- (b) This section does not apply to large transport category airplanes certificated under [part 4a](/cfr/14/part4a.md) of the Civil Air Regulations.

# §135.371. Large transport category airplanes: Reciprocating engine powered: En route limitations: One engine inoperative.

- (a) Except as provided in [paragraph (b)](#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 inoperative, of at least (0.079−0.106/N) Vso2 (where N is the number of engines installed and Vso 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 intended track. However, for the purposes of this paragraph the rate of climb for transport category airplanes certificated under [part 4a](/cfr/14/part4a.md) of the Civil Air Regulations is 0.026 Vso2.
- (b) In place of the requirements of [paragraph (a)](#a) of this section, a person may, under an approved procedure, operate a reciprocating engine powered large transport category airplane at an all-engines-operating altitude that allows the airplane to continue, after an engine failure, to an alternate airport where a landing can be made under [§ 135.377](/cfr/14/135.377.md), allowing for normal consumption 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)](#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 appropriate 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) Vso2 (when N is the number of engines installed and Vso is expressed in knots) for airplanes certificated under [part 25](/cfr/14/part25.md) of this chapter and by 0.026 Vso2 for airplanes certificated under [part 4a](/cfr/14/part4a.md) 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 predetermined 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 nearest approved navigational fix, unless the Administrator approves a procedure established on a different basis upon finding that adequate operational safeguards exist.
  - (3) The airplane must meet the provisions of [paragraph (a)](#a) of this section at 1,000 feet above the airport used as an alternate in this procedure.
  - (4) The procedure must include an approved 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 certificate holder shows that it has an adequate training program, that proper instructions 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 appropriate weather reports or forecasts, or any combination of them, indicate that weather conditions will be at or above the alternate weather minimum specified in the certificate holder's operations specifications for that airport when the flight arrives.

# §135.373. Part 25 transport category airplanes with four or more engines: Reciprocating engine powered: En route limitations: Two engines inoperative.

- (a) No person may operate an airplane certificated under [part 25](/cfr/14/part25.md) and having four or more engines unless—
  - (1) There is no place along the intended track that is more than 90 minutes (with all engines operating at cruising power) from an airport that meets [§ 135.377](/cfr/14/135.377.md); or
  - (2) It is operated at a weight allowing the airplane, with the two critical engines inoperative, to climb at 0.013 Vso2 feet per minute (that is, the number of feet per minute obtained by multiplying the number of knots squared by 0.013) at an altitude of 1,000 feet above the highest ground or obstruction within 10 miles on each side of the intended track, or at an altitude of 5,000 feet, whichever is higher.
- (b) **For the purposes of paragraph (a)(2) of this section, it is assumed that—**
  - (1) The two engines fail at the point that is most critical with respect to the takeoff weight;
  - (2) Consumption of fuel and oil is normal with all engines operating up to the point where the two engines fail with two engines operating beyond that point;
  - (3) Where the engines are assumed to fail at an altitude above the prescribed minimum altitude, compliance with the prescribed rate of climb at the prescribed minimum altitude need not be shown during the descent from the cruising altitude to the prescribed minimum altitude, if those requirements can be met once the prescribed minimum altitude is reached, and assuming descent to be along a net flight path and the rate of descent to be 0.013 Vso2 greater than the rate in the approved performance data; and
  - (4) If fuel jettisoning is provided, the airplane's weight at the point where the two engines fail is considered to be not less than that which would include enough fuel to proceed to an airport meeting [§ 135.377](/cfr/14/135.377.md) and to arrive at an altitude of at least 1,000 feet directly over that airport.

# §135.375. Large transport category airplanes: Reciprocating engine powered: Landing limitations: Destination airports.

- (a) Except as provided in [paragraph (b)](#b) of this section, no person operating a reciprocating engine powered large transport category airplane may take off that airplane, unless its weight on arrival, allowing for normal consumption of fuel and oil in flight, would allow a full stop landing at the intended destination within 60 percent of the effective length of each runway described below from a point 50 feet directly above the intersection of the obstruction clearance plane and the runway. For the purposes of determining the allowable landing weight at the destination airport the following is assumed:
  - (1) **The airplane is landed on the most favorable runway and in the most favorable direction in still air.**
  - (2) The airplane is landed on the most suitable runway considering the probable wind velocity and direction (forecast for the expected time of arrival), the ground handling characteristics of the type of airplane, and other conditions such as landing aids and terrain, and allowing for the effect of the landing path and roll of not more than 50 percent of the headwind component or not less than 150 percent of the tailwind component.
- (b) An airplane that would be prohibited from being taken off because it could not meet [paragraph (a)(2)](#a-2) of this section may be taken off if an alternate airport is selected that meets all of this section except that the airplane can accomplish a full stop landing within 70 percent of the effective length of the runway.

# §135.377. Large transport category airplanes: Reciprocating engine powered: Landing limitations: Alternate airports.


No person may list an airport as an alternate airport in a flight plan unless the airplane (at the weight anticipated at the time of arrival at the airport), based on the assumptions in [§ 135.375(a)](/cfr/14/135.375.md?p=a) (1) and (2), can be brought to a full stop landing within 70 percent of the effective length of the runway.