Appendix B to Part 135 - Airplane Flight Recorder
Specifications----------------------------------------------------------------------------------------------------------------
Installed system
\1\ minimum Sampling interval Resolution \4\
Parameters Range accuracy (to (per second) read out
recovered data)
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Relative time (from recorded on 25 hr minimum..... ±0.125% per 1................. 1 sec.
prior to takeoff). hour.
Indicated airspeed.............. V[INF]so[/INF] to ±5% or 1................. 1% \3\.
V[INF]D[/INF] ±10 kts.,
(KIAS). whichever is
greater.
Resolution 2 kts.
below 175 KIAS.
Altitude........................ -1,000 ft. to max ±100 to 1................. 25 to 150
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........ Full range........ ±3% unless 1................. 1% \3\.
higher uniquely
required.
Or
Pitch control position.......... Full range........ ±3% unless 1................. 1% \3\.
higher uniquely
required.
1 1 1 1 1 Engine Power,
Each Engine
Fan or N[INF]1[/INF] speed or Maximum range..... ±5%.......... 1................. 1% \3\.
EPR or cockpit indications used
for aircraft certification.
Or
Prop. speed and torque (sample .................. .................. 1 (prop speed), 1
once/sec as close together as (torque).
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 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.............
Analog 0-100% ±3°..... 1................. 1% \3\
range.
LE flaps (discrete or analog)... Each discrete .................. 1.................
position (U, D, T/
O, AAP).
Or.............
Analog 0-100% ±3°..... 1................. 1% \3\.
range.
Thrust reverser, each engine Stowed or full .................. 1.................
(Discrete). 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 manufacturing after October 11, 1991.
[Doc. No. 25530, 53 FR 26152, July 11, 1988; 53 FR 30906, Aug.
16, 1988, as amended by Amdt. 135-69, 62 FR 38397, July 17, 1997 ]
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