{"data":{"id":"us/14-cfr-194.310","jurisdiction":"us","citation":"14 CFR 194.310","heading":"Powered-lift in vertical-lift flight mode, flight recorder specifications under part 91 of this chapter.","body":"Table 1 to § 194.310\nParameters Range Installed system1 minimum accuracy (to recovered data) Sampling interval (per second) Resolution 3 read out\nRelative Time (From Recorded on Prior to Takeoff) 4 hr minimum ±0.125% per hour 1 1 sec.\nIndicated 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.\nAltitude −1,000 ft. to 20,000 ft. pressure altitude ±100 to ±700 ft. (see Table 1, TSO C51-a) 1 25 to 150 ft.\nMagnetic Heading 360° ±5° 1 1°\nVertical 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.\nLongitudinal Acceleration ±1.0g ±1.5% max. range excluding datum error of ±5% 2 0.03g.\nPitch Attitude 100% of usable range ±2° 1 0.8°.\nRoll Attitude ±60 or 100% of usable range, whichever is greater ±2° 1 0.8°.\nAltitude Rate ±8,000 fpm ±10% Resolution 250 fpm below 12,000 ft. indicated 1 250 fpm below 12,000.\nEngine Power, Each Engine:\nMain Rotor Speed Maximum Range ±5% 1 1%.2\nFree or Power Turbine Maximum Range ±5% 1 1%.2\nEngine Torque Maximum Range ±5% 1 1%.2\nFlight Control Hydraulic Pressure:\nPrimary (Discrete) High/Low 1\nSecondary—if applicable (Discrete) High/Low 1\nRadio Transmitter Keying (Discrete) On/Off 1\nAutopilot Engaged (Discrete) Engaged or Disengaged 1\nSAS Status-Engaged (Discrete) Engaged or Disengaged 1\nSAS Fault Status (Discrete) Fault/OK 1\nFlight Controls:\nPilot Inputted—Primary Controls (I.E. Ascent, descent, acceleration, and deceleration, heading and directional control for all axis) Full range ±3% 2 1%.2\nControllable Stabilator Position Full range ±3% 2 1%.2\n1 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.\n2 Percent of full range.","path":["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"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"32232df5abf5ebfc791cbfebbe4be11b1cc61a88d39644953ba4b360f88851e9","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-194.309","next":"us/14-cfr-194.311"},"notice":"GroundRules: Original legal text. Not legal advice."}