---
kind: "section"
citation: "14 C.F.R. § 25.103"
title: "14"
number: "25.103"
heading: "Stall speed."
url: "https://uscodex.org/cfr/14/25.103"
---

# §25.103. Stall speed.

- (a) **The reference stall speed, V<I>SR</I>, is a calibrated airspeed defined by the applicant.** VSR may not be less than a 1-g stall speed. VSR is expressed as:
- (b) **V<I>CL</I><I>MAX</I> is determined with—**
  - (1) Engines idling, or, if that resultant thrust causes an appreciable decrease in stall speed, not more than zero thrust at the stall speed;
  - (2) Propeller pitch controls (if applicable) in the takeoff position;
  - (3) The airplane in other respects (such as flaps, landing gear, and ice accretions) in the condition existing in the test or performance standard in which VSR is being used;
  - (4) The weight used when VSR is being used as a factor to determine compliance with a required performance standard;
  - (5) The center of gravity position that results in the highest value of reference stall speed; and
  - (6) The airplane trimmed for straight flight at a speed selected by the applicant, but not less than 1.13VSR and not greater than 1.3VSR.
- (c) Starting from the stabilized trim condition, apply the longitudinal control to decelerate the airplane so that the speed reduction does not exceed one knot per second.
- (d) In addition to the requirements of [paragraph (a)](#a) of this section, when a device that abruptly pushes the nose down at a selected angle of attack (e.g., a stick pusher) is installed, the reference stall speed, VSR, may not be less than 2 knots or 2 percent, whichever is greater, above the speed at which the device operates.

## Notes

### Amendments

[Doc. No. 28404, 67 FR 70825, Nov. 26, 2002, as amended by Amdt. 25-121, 72 FR 44665, Aug. 8, 2007]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702 and 44704; Pub. L. 115-254, 132 Stat 3281 (49 U.S.C. 44903 note).

### Source

Source: Docket No. 5066, 29 FR 18291, Dec. 24, 1964, unless otherwise noted.

### Amendments

[Doc. No. 28404, 67 FR 70825, Nov. 26, 2002, as amended by Amdt. 25-121, 72 FR 44665, Aug. 8, 2007]