FAA Federal Aviation Regulations (FARS, 14 CFR)

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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 ]