14 CFR 194.310 - Powered-lift in vertical-lift flight mode, flight recorder specifications under part 91 of this chapter.

Regulations last checked for updates: Feb 22, 2025

Title 14 - Aeronautics and Space last revised: Jan 22, 2025

View all text of Subpart C [§ 194.301 - § 194.313]

§ 194.310 - Powered-lift in vertical-lift flight mode, flight recorder specifications under part 91 of this chapter.

Parameters	Range	Installed system ¹ minimum accuracy (to recovered data)	Sampling interval (per second)	Resolution 3 read out
Relative Time (From Recorded on Prior to Takeoff)	4 hr minimum	±0.125% per hour	1	1 sec.
Indicated Airspeed	VM in to VD (KIAS) (minimum airspeed signal attainable with installed pilot-static system)	±5% or ±10 kts., whichever is greater	1	1 kt.
Altitude	−1,000 ft. to 20,000 ft. pressure altitude	±100 to ±700 ft. (see Table 1, TSO C51-a)	1	25 to 150 ft.
Magnetic Heading	360°	±5°	1	1°
Vertical Acceleration	−3g to + 6g	±0.2g in addition to ±0.3g maximum datum	4 (or 1 per second where peaks, ref. to 1g are recorded)	0.05g.
Longitudinal Acceleration	±1.0g	±1.5% max. range excluding datum error of ±5%	2	0.03g.
Pitch Attitude	100% of usable range	±2°	1	0.8°.
Roll Attitude	±60 or 100% of usable range, whichever is greater	±2°	1	0.8°.
Altitude Rate	±8,000 fpm	±10% Resolution 250 fpm below 12,000 ft. indicated	1	250 fpm below 12,000.
Engine Power, Each Engine:
Main Rotor Speed	Maximum Range	±5%	1	1%. ²
Free or Power Turbine	Maximum Range	±5%	1	1%. ²
Engine Torque	Maximum Range	±5%	1	1%. ²
Flight Control Hydraulic Pressure:
Primary (Discrete)	High/Low		1
Secondary—if applicable (Discrete)	High/Low		1
Radio Transmitter Keying (Discrete)	On/Off		1
Autopilot Engaged (Discrete)	Engaged or Disengaged		1
SAS Status-Engaged (Discrete)	Engaged or Disengaged		1
SAS Fault Status (Discrete)	Fault/OK		1
Flight Controls:
Pilot Inputted—Primary Controls (I.E. Ascent, descent, acceleration, and deceleration, heading and directional control for all axis)	Full range	±3%	2	1%. ²
Controllable Stabilator Position	Full range	±3%	2	1%. ²

¹ When data sources are aircraft instruments (except altimeters) of acceptable quality to fly the aircraft the recording system excluding these sensors (but including all other characteristics of the recording system) shall contribute no more than half of the values in this column.

² Percent of full range.

authority: 42 U.S.C. 7572; 49 U.S.C. 106(f), 40113, 44701-44705, 44707, 44712, 44713, 44715, 44716, and 44722; Sec. 955 of Pub. L. 118-63

source: FAA-2023-1275, Amdt. No. 194-1, 89 FR 92489, Nov. 21, 2024, unless otherwise noted.

cite as: 14 CFR 194.310