301
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
27. Localizer De-
viation, MLS
Azimuth, or
GPS Latitude
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.
28. Glideslope
Deviation, MLS
Elevation, or
GPS Vertical
Deviation.
±
400 Microamps
or available
sensor range
as installed
0.9 to + 30
°
As installed +
/3
¥
3% rec-
ommended.
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.
29. Marker Bea-
con Passage.
Discrete ‘‘on’’ or
‘‘off’’.
...........................
1 ........................
...........................
A single discrete is accept-
able for all markers.
30. Master Warn-
ing.
Discrete .............
...........................
1 ........................
...........................
Record the master warning
and record each ‘‘red’’
warning that cannot be de-
termined from other pa-
rameters or from the cock-
pit voice recorder.
31. Air/ground
sensor (primary
airplane system
reference nose
or main gear).
Discrete ‘‘air’’ or
‘‘ground’’.
...........................
1 (0.25 rec-
ommended).
32. Angle of At-
tack (If meas-
ured directly).
As installed ........
As installed ........
2 or 0.5 for air-
planes oper-
ated under
§ 121.344(f).
0.3% of full
range.
If left and right sensors are
available, each may be re-
corded at 4 or 1 second in-
tervals, as appropriate, so
as to give a data point at 2
seconds or 0.5 second, as
required.
33. Hydraulic
Pressure Low,
Each System.
Discrete or avail-
able sensor
range, ‘‘low’’ or
‘‘normal’’.
±
5% ...................
2 ........................
0.5% of full
range.
34. Groundspeed
As Installed .......
Most Accurate
Systems In-
stalled.
1 ........................
0.2% of full
range.
35. GPWS
(ground prox-
imity warning
system).
Discrete ‘‘warn-
ing’’ or ‘‘off’’.
...........................
1 ........................
...........................
A suitable combination of
discretes unless recorder
capacity is limited in which
case a single discrete for
all modes is acceptable.
36. Landing Gear
Position or
Landing gear
cockpit control
selection.
Discrete .............
...........................
4 ........................
...........................
A suitable combination of
discretes should be re-
corded.
37. Drift Angle.
15
As installed ........
As installed ........
4 ........................
0.1
°
....................
38. Wind Speed
and Direction.
As installed ........
As installed ........
4 ........................
1 knot, and 1.0
°
.
39. Latitude and
Longitude.
As installed ........
As installed ........
4 ........................
0.002
°
, or as in-
stalled.
Provided by the Primary
Navigation System Ref-
erence. Where capacity
permits Latitude/longitude
resolution should be
0.0002
°
.
40. Stick shaker
and pusher acti-
vation.
Discrete(s) ‘‘on’’
or ‘‘off’’.
...........................
1 ........................
...........................
A suitable combination of
discretes to determine acti-
vation.
41. Windshear
Detection.
Discrete ‘‘warn-
ing’’ or ‘‘off’’.
...........................
1.
VerDate Sep<11>2014
08:20 May 17, 2019
Jkt 247048
PO 00000
Frm 00311
Fmt 8010
Sfmt 8002
Y:\SGML\247048.XXX
247048