370 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 125, App. D 

Parameters Range 

Accuracy sensor input to 

DFDR readout 

Sampling inter-

val (per second) 

Resolution

4

 

read out 

Altitude ......................................

¥

1,000 ft to max cer-
tificated altitude of 
aircraft.

±

100 to 

±

700 ft (See Table 1, 

TSO-C51a).

1 ........................

5

′ 

to 35

′

1

 

Airspeed ...................................

50 KIAS to V

so

, and V

so

 

to 1.2 V

D

.

±

5%, 

±

3% ...............................

1 ........................

1 kt. 

Heading ....................................

360

°

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

±

2

°

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

1 ........................

0.5

° 

Normal Acceleration (Vertical)

¥

3g to + 6g .................

±

1% of max range excluding 

datum error of 

±

5%.

8 ........................

0.01g. 

Pitch Attitude ............................

±

75

°

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

±

2

°

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

1 ........................

0.5

°

. 

Roll Attitude ..............................

±

180

°

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

±

2

°

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

1 ........................

0.5

°

. 

Radio Transmitter Keying .........

On-Off (Discrete) .........

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

1 ........................

Thrust/Power on Each Engine

Full range forward .......

±

2% ........................................

1 ........................

0.2%

2

 

Trailing Edge Flap or Cockpit 

Control Selection.

Full range or each dis-

crete position.

±

3

° 

or as pilot’s Indicator .......

0.5 .....................

0.5%

2

 

Leading Edge Flap or Cockpit 

Control Selection.

Full range or each dis-

crete position.

±

3

° 

or as pilot’s indicator .......

0.5 .....................

0.5%

2

 

Thrust Reverser Position ..........

Stowed, in transit, and 

reverse (Discrete).

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

1 (per 4 sec-

onds per en-
gine).

Ground Spoiler Position/Speed 

Brake Selection.

Full range or each dis-

crete position.

±

2% unless higher accuracy 

uniquely required.

1 ........................

0.2%

2

. 

Marker Beacon Passage ..........

Discrete ........................

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

1 ........................

Autopilot Engagement ..............

Discrete ........................

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

1 ........................

Longitudinal Acceleration .........

±

1g ...............................

±

1.5% max range excluding 

datum error of 

±

5%.

4 ........................

0.01g 

Pilot Input and/or Surface Posi-

tion-Primary Controls (Pitch, 
Roll, Yaw)

3

.

Full range .....................

±

2

° 

unless higher accuracy 

uniquely required.

1 ........................

0.2%

2

. 

Lateral Acceleration ..................

±

1g ...............................

±

1.5% max range excluding 

datum error of 

±

5%.

4 ........................

0.01g. 

Pitch Trim Position ...................

Full range .....................

±

3% unless higher accuracy 

uniquely required.

1 ........................

0.3%

2

 

Glideslope Deviation ................

±

400 Microamps ..........

±

3% ........................................

1 ........................

0.3%

2

 

Localizer Deviation ...................

±

400 Microamps ..........

±

3% ........................................

1 ........................

0.3%

2

. 

AFCS Mode and Engagement 

Status.

Discrete ........................

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

1 ........................

Radio Altitude ...........................

¥

20 ft to 2,500 ft ........

±

2 Ft or 

±

3% Whichever is 

Greater Below 500 Ft and 

±

5% Above 500 Ft.

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

1 ft + 5%

2

 

above 500

′

. 

Master Warning ........................

Discrete ........................

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

1 ........................

Main Gear Squat Switch Status  Discrete ........................

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

1 ........................

Angle of Attack (if recorded di-

rectly).

As installed ..................

As installed .............................

2 ........................

0.3%

2

. 

Outside Air Temperature or 

Total Air Temperature.

¥

50 

°

C to + 90 

°

C ......

±

2 

°

C ......................................

0.5 .....................

0.3 

°

C 

Hydraulics, Each System Low 

Pressure.

Discrete ........................

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

0.5 .....................

or 0.5%

2

. 

Groundspeed ............................

As Installed ..................

Most Accurate Systems In-

stalled (IMS Equipped Air-
craft Only).

1 ........................

0.2%

2

. 

If additional recording capacity is available, recording of the following parameters is recommended. The parameters are listed in 

order of significance: 

Drift Angle .................................

When available. As in-

stalled.

As installed .............................

4 ........................

Wind Speed and Direction .......

When available. As in-

stalled.

As installed .............................

4 ........................

Latitude and Longitude .............

When available. As in-

stalled.

As installed .............................

4 ........................

Brake pressure/Brake pedal 

position.

As installed ..................

As installed .............................

1 ........................

Additional engine parameters: 

EPR ...................................

As installed ..................

As installed .............................

1 (per engine) ...

N

1

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

As installed ..................

As installed .............................

1 (per engine) ...

N

2

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

As installed ..................

As installed .............................

1 (per engine) ...

EGT ...................................

As installed ..................

As installed .............................

1 (per engine) ...

Throttle Lever Position .............

As installed ..................

As installed .............................

1 (per engine) ...

Fuel Flow ..................................

As installed ..................

As installed .............................

1 (per engine) ...

TCAS: 

TA ......................................

As installed ..................

As installed .............................

1 ........................

RA .....................................

As installed ..................

As installed .............................

1 ........................

Sensitivity level (as se-

lected by crew).

As installed ..................

As installed .............................

2 ........................

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