298
14 CFR Ch. I (1–1–19 Edition)
Pt. 121, App. M
Part 121 section
Applicable aircraft
Provisions: CFR/FR references
§ 121.312(c) ....................
Airplane type certificated in accordance with
SFAR No. 41; maximum certificated takeoff
weight in excess of 12,500 pounds.
Compartment interior requirements. 14 CFR
25.853(a) in effect March 6, 1995: 14 CFR
parts 1 to 59, Revised as of January 1, 1995,
and amended by \n25–83, 60 FR 6623, Feb-
ruary 2, 1995.
Formerly 14 CFR 25.853(a), (b–1), (b–2), and
(b–3) in effect on September 26, 1978: 14
CFR parts 1 to 59, Revised as of January 1,
1978.
§ 121.314(a) ...................
Transport category airplanes type certificated
after January 1, 1958.
Class C or D cargo or baggage compartment
definition, 14 CFR 25.857 in effect on June 16,
1986, 14 CFR parts 1 to 59, Revised 1/1/97,
and amended by Amendment 25–60, 51 FR
18243, May 16, 1986.
[Doc. No. 28154, 60 FR 65936, Dec. 20, 1995, as amended by Amdt. 121–269, 63 FR 8049, Feb. 17,
1998]
A
PPENDIX
M
TO
P
ART
121—A
IRPLANE
F
LIGHT
R
ECORDER
S
PECIFICATIONS
The recorded values must meet the designated range, resolution and accuracy requirements during static and dynamic condi-
tions. Dynamic condition means the parameter is experiencing change at the maximum rate attainable, including the maximum
rate of reversal. All data recorded must be correlated in time to within one second.
Parameters Range
Accuracy (sensor
input)
Seconds per
sampling interval
Resolution Remarks
1. Time or relative
times counts.
1
24 Hrs, 0 to
4095.
±
0.125% per
hour.
4 ........................
1 sec .................
UTC time preferred when
available. Count incre-
ments each 4 seconds of
system operation.
2. Pressure Alti-
tude.
¥
1000 ft to max
certificated alti-
tude of aircraft.
+ 5000 ft.
±
100 to
±
700 ft
(see table,
TSO C124a or
TSO C51a).
1 ........................
5
′
to 35
′
.............
Data should be obtained
from the air data computer
when practicable.
3. Indicated air-
speed or Cali-
brated airspeed.
50 KIAS or min-
imum value to
Max V
so
to 1.2
V.
D
.
±
5% and
±
3% ....
1 ........................
1 kt ....................
Data should be obtained
from the air data computer
when practicable.
4. Heading (Pri-
mary flight crew
reference).
0–360
°
and Dis-
crete ‘‘true’’ or
‘‘mag’’.
±
2
°
.....................
1 ........................
0.5
°
....................
When true or magnetic head-
ing can be selected as the
primary heading reference,
a discrete indicating selec-
tion must be recorded.
5. Normal accel-
eration
(vertical)
9
.
¥
3g to + 6g ......
±
1% of max
range exclud-
ing datum
error of
±
5%.
0.125 .................
0.004g.
6. Pitch Attitude ..
±
75
°
...................
±
2
°
.....................
1 or 0.25 for air-
planes oper-
ated under
§ 121.344(f).
0.5
°
....................
A sampling rate of 0.25 is
recommended.
7. Roll attitude
2
...
±
180
°
.................
±
2
°
.....................
1 or 0.5 for air-
planes oper-
ated under
§ 121.344(f).
0.5 .....................
A sampling rate of 0.5 is rec-
ommended.
8. Manual Radio
Transmitter
Keying or CVR/
DFDR synchro-
nization ref-
erence.
On-Off (Discrete)
None
...........................
1 ........................
...........................
Preferably each crew mem-
ber but one discrete ac-
ceptable for all trans-
mission provided the CVR/
FDR system complies with
TSO C124a CVR synchro-
nization requirements
(paragraph 4.2.1 ED–55).
9. Thrust/power
on each en-
gine—primary
flight crew ref-
erence.
Full range for-
ward.
±
2% ...................
1 (per engine) ...
0.3% of full
range.
Sufficient parameters (e.g.
EPR, N1 or Torque, NP)
as appropriate to the par-
ticular engine being re-
corded to determine power
in forward and reverse
thrust, including potential
overspeed condition.
VerDate Sep<11>2014
08:20 May 17, 2019
Jkt 247048
PO 00000
Frm 00308
Fmt 8010
Sfmt 8002
Y:\SGML\247048.XXX
247048