14 C.F.R. Appendix F to Part 91—Helicopter Flight Recorder Specifications
Title 14 - Aeronautics and Space
[Doc. No. 18334, 54 FR 34328, Aug. 18, 1989; 54 FR 41211, Oct. 5, 1989; 54 FR 53036, Dec. 26, 1989]
Title 14: Aeronautics and Space
PART 91—GENERAL OPERATING AND FLIGHT RULES
Subpart K—Fractional Ownership Operations
Appendix F to Part 91—Helicopter Flight Recorder Specifications
---------------------------------------------------------------------------------------------------------------- Installed system \1\ minimum Sampling interval Resolution 3 read Parameters Range accuracy (to (per second) out recovered data)----------------------------------------------------------------------------------------------------------------Relative Time (From Recorded on 4 hr minimum...... ±0.125% per 1................. 1 sec. Prior to Takeoff). hour.Indicated Airspeed.............. VM in to VD (KIAS) ±5% or 1................. 1 kt. (minimum airspeed ±10 kts., signal attainable whichever is with installed greater. pilot-static system).Altitude........................ -1,000 ft. to ±100 to 1................. 25 to 150 ft. 20,000 ft. ±700 ft. pressure altitude. (see Table 1, TSO C51-a).Magnetic Heading................ 360°.......... ±5°.... 1................. 1°Vertical Acceleration........... -3g to +6g........ ±0.2g in 4 (or 1 per second 0.05g. addition to where peaks, ref. ±0.3g to 1g are maximum datum. recorded).Longitudinal Acceleration....... ±1.0g...... ±1.5% max. 2................. 0.03g. range excluding datum error of ±5%.Pitch Attitude.................. 100% of usable ±2°.... 1................. 0.8° range.Roll Attitude................... ±60 or 100% ±2°.... 1................. 0.8° of usable range, whichever is greater.Altitude Rate................... ±8,000 fpm. ±10% 1................. 250 fpm below Resolution 250 12,000. fpm below 12,000 ft. indicated. Engine Power, Each EngineMain 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 PressurePrimary (Discrete).............. High/Low.......... .................. 1.................Secondary_if applicable High/Low.......... .................. 1................. (Discrete).Radio Transmitter Keying On/Off............ .................. 1................. (Discrete).Autopilot Engaged (Discrete).... Engaged or .................. 1................. Disengaged.SAS Status-Engaged (Discrete)... Engaged or .................. 1................. Disengaged.SAS Fault Status (Discrete)..... Fault/OK.......... .................. 1................. Flight ControlsCollective...................... Full range........ ±3%........ 2................. 1%2.Pedal Position.................. Full range........ ±3%........ 2................. 1%2.Lat. Cyclic..................... Full range........ ±3%........ 2................. 1%2.Long. Cyclic.................... 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\ Per cent of full range.\3\ This column applies to aircraft manufactured after October 11, 1991.
