373 

Federal Aviation Administration, DOT 

Pt. 125, App. E 

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 

17. Yaw control 

surface(s) posi-
tion

8 18

.

Full range ..........

±

2

° 

unless high-

er accuracy 
uniquely re-
quired.

0.5 .....................

0.2% of full 

range.

For airplanes fitted with mul-

tiple or split surfaces, a 
suitable combination of 
surface position sensors is 
acceptable in lieu of re-
cording each surface sepa-
rately. The control surfaces 
may be sampled alter-
nately to produce the sam-
pling interval of 0.5. 

18. Lateral Accel-

eration.

±

1g ....................

±

1.5% max. 

range exclud-
ing datum 
error of 

±

5%.

0.25 ...................

0.004g. 

19. Pitch Trim 

Surface Posi-
tion.

Full Range .........

±

3

° 

Unless High-

er Accuracy 
Uniquely Re-
quired.

1 ........................

0.6% of full 

range 

20. Trailing Edge 

Flap or Cockpit 
Control Selec-
tion.

10

.

Full Range or 

Each Position 
(discrete).

±

3

° 

or as Pilot’s 

indicator.

2 ........................

0.5% of full 

range.

Flap position and cockpit 

control may each be sam-
pled at 4 second intervals, 
to give a data point every 
2 seconds. 

21. Leading Edge 

Flap or Cockpit 
Control Selec-
tion.

11

.

Full Range or 

Each Discrete 
Position.

±

3

° 

or as Pilot’s 

indicator and 
sufficient to 
determine 
each discrete 
position.

2 ........................

0.5% of full 

range.

Left and right sides, or flap 

position and cockpit control 
may each be sampled at 4 
second intervals, so as to 
give a data point every 2 
seconds. 

22. Each Thrust 

Reverser Posi-
tion (or equiva-
lent for pro-
peller airplane).

Stowed, In Tran-

sit, and Re-
verse (Dis-
crete).

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

1 (per engine). ..

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

Turbo-jet—2 discretes enable 

the 3 states to be deter-
mined. 

Turbo-prop—1 discrete. 

23. Ground Spoil-

er Position or 
Speed Brake 
Selection

12

.

Full Range or 

Each Position 
(discrete).

±

2

° 

Unless high-

er accuracy 
uniquely re-
quired.

1 or 0.5 for air-

planes oper-
ated under 
§ 125.226(f).

0.2% of full 

range.

24. Outside Air 

Temperature or 
Total Air Tem-
perature.

13

.

¥

50 

°

C to + 90 

°

C.

±

2 

°

C .................

2 ........................

0.3 

°

C..

25. Autopilot/ 

Autothrottle/ 
AFCS Mode 
and Engage-
ment Status.

A suitable com-

bination of 
discretes.

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

1 ........................

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

Discretes should show which 

systems are engaged and 
which primary modes are 
controlling the flight path 
and speed of the aircraft. 

26. Radio Alti-

tude

14

.

¥

20 ft to 2,500 
ft.

±

2 ft or 

±

3% 

Whichever is 
Greater Below 
500 ft and 

±

5% above 

500 ft.

1 ........................

1 ft + 5% Above 

500 ft.

For autoland/category 3 op-

erations. Each radio altim-
eter should be recorded, 
but arranged so that at 
least one is recorded each 
second. 

27. Localizer De-

viation, MLS 
Azimuth, or 
GPS Lateral 
Deviation.

±

400 Microamps 

or available 
sensor range 
as installed 

±

62

°

.

As installed. 

±

3% 

recommended ...

1 ........................

0.3% of full 

range.

For autoland/category 3 op-

erations. each system 
should be recorded but ar-
ranged so that at least one 
is recorded each second. It 
is not necessary to record 
ILS and MLS at the same 
time, only the approach aid 
in use need be recorded. 

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