Title 14

PART 91 APPENDIX F


Appendix F to Part 91 - Helicopter Flight Recorder Specifications

14:2.0.1.3.12.16.9.1.29 : Appendix F

Appendix F to Part 91 - Helicopter Flight Recorder Specifications
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
Collective 4 Full range ±3% 2 1%2.
Pedal Position 4 Full range ±3% 2 1%2.
Lat. Cyclic 4 Full range ±3% 2 1%2.
Long. Cyclic 4 Full range ±3% 2 1%2.
Controllable Stabilator Position 4 Full range ±3% 2 1%2.