858
14 CFR Ch. I (1–1–19 Edition)
Pt. 91, App. F
A
PPENDIX
F
TO
P
ART
91—H
ELICOPTER
F
LIGHT
R
ECORDER
S
PECIFICATIONS
Parameters Range
Installed system
1
min-
imum accuracy (to recov-
ered 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) (min-
imum airspeed signal
attainable with installed
pilot-static system).
±
5% or
±
10 kts., which-
ever 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 Accelera-
tion.
±
1.0g ................................
±
1.5% max. range ex-
cluding 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. indi-
cated.
1 .................................
250 fpm below
12,000.
Engine Power, Each
Engine
Main Rotor Speed .....
Maximum Range .............
±
5% .................................
1 .................................
1%2.
Free or Power Tur-
bine.
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 appli-
cable (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.
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.
4
For all aircraft manufactured on or after April 6, 2012, the sampling interval per second is 4.
[Doc. No. 18334, 54 FR 34328, Aug. 18, 1989; 54 FR 41211, Oct. 5, 1989; 54 FR 53036, Dec. 26, 1989;
Amdt. 91–300, 73 FR 12565, Mar. 7, 2008; 73 FR 15280, Mar. 21, 2008; Amdt. 91–313, 75 FR 17046,
Apr. 5, 2010]
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