529 

Federal Aviation Administration, DOT 

Pt. 135, App. F 

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 

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 
§ 135.152(j).

0.5

°

....................

A sampling rate of 0.25 is 

recommended. 

7. Roll Attitude

2

..

±

180

°

.................

±

2

°

.....................

1 or 0.5 0.5 air-

planes oper-
ated under 
§ 135.152(j).

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. 

10. Autopilot En-

gagement.

Discrete ‘‘on’’ or 

‘‘off’’.

...........................

1 ........................

11. Longitudinal 

Acceleration.

±

1g ....................

±

1.5% max. 

range exclud-
ing datum 
error of 

±

5%.

0.25 ...................

0.004g. 

12a. Pitch con-

trol(s) position 
(nonfly-by-wire 
systems)

18

.

Full Range .........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 or 0.25 for 

airplanes oper-
ated under 
§ 135.152(j).

0.5% of full 

range.

For airplanes that have a 

flight control breakaway 
capability that allows either 
pilot to operate the controls 
independently, record both 
control inputs. The control 
inputs may be sampled al-
ternately once per second 
to produce the sampling in-
terval of 0.5 or 0.25, as ap-
plicable. 

12b. Pitch con-

trol(s) position 
(fly-by-wire sys-
tems)

3 18

.

Full Range .........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 or 0.25 for 

airplanes oper-
ated under 
§ 135.152(j).

0.2% of full 

range.

13a. Lateral con-

trol position(s) 
(nonfly-by- 
wire)

18

.

Full Range .........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 or 0.25 for 

airplanes oper-
ated under 
§ 135.152(j).

0.2% of full 

range.

For airplanes that have a 

flight control breakaway 
capability that allows either 
pilot to operate the controls 
independently, record both 
control inputs. The control 
inputs may be sampled al-
ternately once per second 
to produce the sampling in-
terval of 0.5 or 0.25, as ap-
plicable. 

13b. Lateral con-

trol position(s) 
(fly-by-wire)

4 18

.

Full Range .........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 or 0.25 for 

airplanes oper-
ated under 
§ 135.152(j).

0.2% of full 

range.

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