---
kind: "section"
citation: "14 C.F.R. § 27.65"
title: "14"
number: "27.65"
heading: "Climb: all engines operating."
url: "https://uscodex.org/cfr/14/27.65"
---

# §27.65. Climb: all engines operating.

- (a) **For rotorcraft other than helicopters—**
  - (1) The steady rate of climb, at VY, must be determined—
    - (i) With maximum continuous power on each engine;
    - (ii) With the landing gear retracted; and
    - (iii) For the weights, altitudes, and temperatures for which certification is requested; and
  - (2) The climb gradient, at the rate of climb determined in accordance with [paragraph (a)(1)](#a-1) of this section, must be either—
    - (i) **At least 1—** 10 if the horizontal distance required to take off and climb over a 50-foot obstacle is determined for each weight, altitude, and temperature within the range for which certification is requested; or
    - (ii) **At least 1—** 6 under standard sea level conditions.
- (b) Each helicopter must meet the following requirements:
  - (1) VY must be determined—
    - (i) For standard sea level conditions;
    - (ii) At maximum weight; and
    - (iii) **With maximum continuous power on each engine.**
  - (2) The steady rate of climb must be determined—
    - (i) At the climb speed selected by the applicant at or below VNE;
    - (ii) Within the range from sea level up to the maximum altitude for which certification is requested;
    - (iii) For the weights and temperatures that correspond to the altitude range set forth in [paragraph (b)(2)(ii)](#b-2-ii) of this section and for which certification is requested; and
    - (iv) **With maximum continuous power on each engine.**

## Notes

### Amendments

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-14, 43 FR 2324, Jan. 16, 1978; Amdt. 27-33, 61 FR 21907, May 10, 1996]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704.

### Source

Source: Docket No. 5074, 29 FR 15695, Nov. 24, 1964, unless otherwise noted.

### Amendments

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-14, 43 FR 2324, Jan. 16, 1978; Amdt. 27-33, 61 FR 21907, May 10, 1996]