Appendix E to Part 91 - Airplane
Flight Recorder Specifications----------------------------------------------------------------------------------------------------------------
Installed system
\1\ minimum Sampling interval Resolution \4\
Parameters Range accuracy (to (per second) read out
recovered data)
----------------------------------------------------------------------------------------------------------------
Relative Time (From Recorded on 8 hr minimum...... ±0.125% per 1................. 1 sec.
Prior to Takeoff). hour.
Indicated Airspeed.............. Vso to VD (KIAS).. ±5% or 1................. 1% \3\
±10 kts.,
whichever is
greater.
Resolution 2 kts.
below 175 KIAS.
Altitude........................ -1,000 ft. to max ±100 to 11................ 25 to 150 ft.
cert. alt. of A/C. ±700 ft.
(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 0.03g.
addition to where peaks, ref.
±0.3g to 1g are
maximum datum. recorded).
Longitudinal Acceleration....... ±1.0g........ ±1.5% max. 2................. 0.01g.
range excluding
datum error of
±5%.
Pitch Attitude.................. 100% of usable.... ±2°..... 1................. 0.8°
Roll Attitude................... ±60° or ±2°..... 1................. 0.8°
100% of usable
range, whichever
is greater.
Stabilizer Trim Position, or.... Full Range........ ±3% unless 1................. 1% \3\
higher uniquely
required.
Pitch Control Position..........
Engine Power, Each Engine: Full Range........ ±3% unless 1................. 1% \3\
higher uniquely
required.
Fan or N [SU]1[/SU] Speed or Maximum Range..... ±5%.......... 1................. 1% \3\
EPR or Cockpit indications
Used for Aircraft
Certification OR.
Prop. speed and Torque .................. .................. 1 (prop Speed).... 1%\3\
(Sample Once/Sec as Close 1 (torque)........ 1% \3\
together as Practicable).
Altitude Rate \2\ (need depends ±8,000 fpm... ±10%. 1................. 250 fpm. below
on altitude resolution). Resolution 250 12,000
fpm below 12,000
ft. indicated.
Angle of Attack \2\ (need -20° to ±2°..... 1................. 0.8%\3\
depends on altitude resolution). 40° or 100%
of usable range.
Radio Transmitter Keying On/Off............ .................. 1................. ..................
(Discrete).
TE Flaps (Discrete or Analog)... Each discrete .................. 1................. ..................
position (U, D, T/
O, AAP) OR.
LE Flaps (Discrete or Analog)... Analog 0-100% ±3%.......... 1................. 1%\3\
range.
Each discrete .................. 1................. ..................
position (U, D, T/
O, AAP) OR.
Thrust Reverser, Each Engine Analog 0-100% ±3°..... 1................. 1%\3\
(Discrete). range.
Stowed or full .................. .................. ..................
reverse.
Spoiler/Speedbrake (Discrete)... Stowed or out..... .................. 1................. ..................
Autopilot Engaged (Discrete).... Engaged or .................. 1................. ..................
Disengaged.
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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\ 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.
\3\ Per cent of full range.
\4\ This column applies to aircraft manufactured after October 11, 1991.
[Doc. No. 18334, 54 FR 34327, Aug. 18, 1989]
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