{"data":{"id":"us/14-cfr-194.313","jurisdiction":"us","citation":"14 CFR 194.313","heading":"Powered-lift in wing-borne flight mode, flight recorder specification under part 135 of this chapter.","body":"Table 1 to § 194.313\nParameters Range Installed system1 minimum accuracy (to recovered data) Sampling interval (per second) Resolution read out\nRelative time (from recorded on prior to takeoff) 25 hr minimum ±0.125% per hour 1 1 sec.\nIndicated airspeed Vso to VD (KIAS) ±5% or ±10 kts., whichever is greater. Resolution 2 kts. below 175 KIAS 1 1%.3\nAltitude −1,000 ft. to max cert. alt. of A/C ±100 to ±700 ft. (see Table 1, TSO C51-a) 1 25 to 150\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) 0.03g.\nLongitudinal acceleration ±1.0g ±1.5% max. range excluding datum error of ±5% 2 0.01g.\nPitch attitude 100% of usable ±2° 1 0.8°\nRoll attitude ±60° or 100% of usable range, whichever is greater ±2° 1 0.8°\nStabilizer trim position Full range ±3% unless higher uniquely required 1 1%.3\nOr\nPitch control position Full range ±3% unless higher uniquely required 1 1%.3\nEngine Power, Each Engine\nFan or N1 speed or EPR or cockpit indications used for aircraft certification Maximum range ±5% 1 1%.3\nOr\nProp. speed and torque (sample once/sec as close together as practicable) 1 (prop speed), 1 (torque)\nAltitude rate 2 (need depends on altitude resolution) ±8,000 fpm ±10%. Resolution 250 fpm below 12,000 ft. indicated 1 250 fpm Below 12,000\nAngle of attack 2 (need depends on altitude resolution) −20° to 40° or of usable range ±2° 1 0.8%.3\nRadio transmitter keying (discrete) On/off 1\nTE flaps (discrete or analog) Each discrete position (U, D, T/O, AAP) 1\nOr\nAnalog 0-100% range ±3° 1 1%.3\nLE flaps (discrete or analog) Each discrete position (U, D, T/O, AAP) 1\nOr\nAnalog 0-100% range ±3° 1 1%.3\nThrust reverser, each engine (Discrete) Stowed or full reverse 1\nSpoiler/speedbrake (discrete) Stowed or out 1\nAutopilot engaged (discrete) Engaged or disengaged 1\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 If data from the altitude encoding altimeter (100 ft. resolution) is used, then either one of these parameters should also be recorded. If, however, altitude is recorded at a minimum resolution of 25 feet, then these two parameters can be omitted.\n3 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":"1716cced80636f351019d2599335259b811903f641e3377558489427ef40b155","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-194.312","next":"us/14-cfr-194.401"},"notice":"GroundRules: Original legal text. Not legal advice."}