# 14 CFR § 29.1323: Airspeed indicating system

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1323

## Section

- **Citation:** 14 CFR § 29.1323
- **Heading:** Airspeed indicating system
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 14—Aeronautics and Space > CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER C—AIRCRAFT > PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT > Subpart F—Equipment > Instruments: Installation

## Text

For each airspeed indicating system, the following apply:
(a) Each airspeed indicating instrument must be calibrated to indicate true airspeed (at sea level with a standard atmosphere) with a minimum practicable instrument calibration error when the corresponding pitot and static pressures are applied.
(b) Each system must be calibrated to determine system error excluding airspeed instrument error. This calibration must be determined—
(1) In level flight at speeds of 20 knots and greater, and over an appropriate range of speeds for flight conditions of climb and autorotation; and
(2) During takeoff, with repeatable and readable indications that ensure—
(i) Consistent realization of the field lengths specified in the Rotorcraft Flight Manual; and
(ii) Avoidance of the critical areas of the height-velocity envelope as established under § 29.87.
(c) For Category A rotorcraft—
(1) The indication must allow consistent definition of the takeoff decision point; and
(2) The system error, excluding the airspeed instrument calibration error, may not exceed—
(i) Three percent or 5 knots, whichever is greater, in level flight at speeds above 80 percent of takeoff safety speed; and
(ii) Ten knots in climb at speeds from 10 knots below takeoff safety speed to 10 knots above VY.
(d) For Category B rotorcraft, the system error, excluding the airspeed instrument calibration error, may not exceed 3 percent or 5 knots, whichever is greater, in level flight at speeds above 80 percent of the climbout speed attained at 50 feet when complying with § 29.63.
(e) Each system must be arranged, so far as practicable, to prevent malfunction or serious error due to the entry of moisture, dirt, or other substances.
(f) Each system must have a heated pitot tube or an equivalent means of preventing malfunction due to icing.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-3, 33 FR 970, Jan. 26, 1968; Amdt. 29-24, 49 FR 44439, Nov. 6, 1984; Amdt. 29-39, 61 FR 21901, May 10, 1996; Amdt. 29-44, 64 FR 45338, Aug. 19, 1999]

## Nearby sections

- [14 CFR § 29.1301 § 29.1301 Function and installation.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1301.md)
- [14 CFR § 29.1303 § 29.1303 Flight and navigation instruments.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1303.md)
- [14 CFR § 29.1305 § 29.1305 Powerplant instruments.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1305.md)
- [14 CFR § 29.1307 § 29.1307 Miscellaneous equipment.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1307.md)
- [14 CFR § 29.1309 § 29.1309 Equipment, systems, and installations.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1309.md)
- [14 CFR § 29.1316 § 29.1316 Electrical and electronic system lightning protection.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1316.md)
- [14 CFR § 29.1317 § 29.1317 High-intensity Radiated Fields (HIRF) Protection.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1317.md)
- [14 CFR § 29.1321 § 29.1321 Arrangement and visibility.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1321.md)
- [14 CFR § 29.1322 § 29.1322 Warning, caution, and advisory lights.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1322.md)
- [14 CFR § 29.1323 § 29.1323 Airspeed indicating system.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1323.md)
- [14 CFR § 29.1325 § 29.1325 Static pressure and pressure altimeter systems.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1325.md)
- [14 CFR § 29.1327 § 29.1327 Magnetic direction indicator.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1327.md)
- [14 CFR § 29.1329 § 29.1329 Automatic pilot and flight guidance system.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1329.md)
- [14 CFR § 29.1331 § 29.1331 Instruments using a power supply.](https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1331.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-14-29.1323. Check the current official text before relying on it. Not legal advice.