299 

Federal Aviation Administration, DOT 

Pt. 121, App. M 

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 

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 
§ 121.344(f).

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 
§ 121.344(f).

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 
§ 121.344(f).

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 
§ 121.344(f).

0.2% of full 

range..

14a. Yaw control 

position(s) 
(nonfly-by- 
wire).

5 18

 

Full Range .........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 .....................

0.3% 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. 

14b. Yaw control 

position(s) (fly- 
by-wire).

18

 

Full Range .........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 .....................

0.2% of full 

range.

15. Pitch control 

surface(s) posi-
tion.

6 18

 

Full Range .........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 or 0.25 for 

airplanes oper-
ated under 
§ 121.344(f).

0.3% of full 

range.

For airplanes fitted with mul-

tiple or split surfaces, a 
suitable combination of in-
puts is acceptable in lieu of 
recording each surface 
separately. The control 
surfaces may be sampled 
alternately once per sec-
ond to produce the sam-
pling interval of 0.5 or 
0.25, as applicable. 

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