Federal regulations · Through 2026-08-25 · Newer source version available

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

Table 1 to § 194.310
Parameters Range Installed system1 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.

Where this section sits in the code

Title 14—Aeronautics and Space
CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
SUBCHAPTER L—OTHER SPECIAL FEDERAL AVIATION REGULATIONS
PART 194—SPECIAL FEDERAL AVIATION REGULATION NO. 120—POWERED-LIFT: PILOT CERTIFICATION AND TRAINING; OPERATIONS REQUIREMENTS
Subpart C—Requirements for Persons Operating Powered-Lift

Table 1 to § 194.310

Parameters Range Installed system1 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.

Collected 2026-08-27T02:24:20Z. Source file · JSON

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