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.
1 1 1 1 1 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 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 Controls
Collective...................... 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.
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\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.
[Doc. No. 18334, 54 FR 34328, Aug. 18, 1989; 54 FR 41211, Oct.
5, 1989; 54 FR 53036, Dec. 26, 1989]
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