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Range = [O, 591
LSB = 601512 min
MSB = 320
ESTIMATED FLIGHT LEVEL
(NORMAL FLIGHT)
Range = [O, 6401
LSB = 10 -
MSB = 30 min
2) The estimated time or flight level shall be calculated from the
trajectory scheduled in the FMS.
TlME TO GO
(DIRECT ROUTE)
Range = [o, 591
LSB = 601512 min
--L --
RESERVED
Note.- More detailed information on the next waypoint is
given in BDS 4,1 to 4,3.
3) When the waypoint identity has only three characters, two
leading 0 characters shall be added (e.g. CDN becomes
OOCDN).
4) Estimated time is in minutes and a value of all ones shall be
used to indicate that the waypoint referred to is more than
one hour away.
2811 1/02
No. 77
Annex 10 - Aero~tautical Telecommunications
Table 2-95. BDS code 5,F - Quasi-static parameter monitoring
MB FIELD
23 1 TARGET ALTITUDE
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SELECTED ALTITUDE
SELECTED HEADING
SELECTED SPEED
SELECTED MACH NUMBER
SELECTED ALTITUDE RATE
SELECTED FLIGHT PATH ANGLE
NEXTWAYPOINT
FMS HORIZONTAL MODE
FMS VERTICAL MODE
VHF CHANNEL REPORT
METEOROLOGICAL HAZARDS
Volume ZXI
32 -
33
34
35
36
37
38
39
-40
41
42
43
44
45
46
47
48 -
49
50
5 1
52
53
54
55
56
PURPOSE: To permit the monitoring of changes in parameters
that do not normally change very frequently, i.e. those expected
to be stable for 5 minutes or more by accessing a single
register.
RESERVED
Parameter monitor coding:
The changing of each parameter shall be monitored by 2 bits.
The value 00 shall indicate that no valid data are available on
this parameter. The decimal value for this 2-bit field shall be
cycled through 1,2 and 3, each step indicating a change in the
monitored parameter.
The meteorological hazards subfield shall report changes to
turbulence, wind shear, wake vortex, icing and microburst, as in
register number 45,,.
28111102
Nn. 77
Part I Annex I0 - Aeronnzrtical Telecommunications
Table 2-96. BDS code 6,O - Heading and speed report
MB FIELD I i IF= West ( e g 315' = -45)
MSB = 90 degrees
MAGNETIC HEADING
Range = [-180, +I801
LSB = 90151 2 degrees
-STAT US
MSB = 512 kt
INDICATED AIRSPEED
Range = [O, 1 0231
LSB = 5121512 = 1 kt
STATUS
MSB = 2.048
MACH
LSB = 2.048/512
STATUS
SlGN 1 = Below
MSB = 8 192 Wmin
BAROMETRIC ALTITUDE
RATE
Range = [-A6 384, +I 6 3521
LSB = 8 1921256 = 32 fffmin
- -
MSB = 8 192 Wmin
INERTIAL VERTICAL
VELOCITY (1 :5 I( Range = 1-1 6 384. +I 6 3521
PURPOSE; To provide heading and speed data to ground
systems.
1) The maximum acceptable data age at time of transmission
to the ground shall be 1 second tor all parameters.
2) The register update rate shall be sufficient to ensure that the
maximum acceptable data age of all parameters is not
exceeded in normal operations.
3) If maximum acceptable data age is exceeded for any
parameter, then the status bit for that parameter shall be
actively set to 0 by the GFM.
4) If the value of a parameter from the data source exceeds the
range allowable in the register definition, the maximum
allowable value in the correct positive or negative sense
shall be used instead.
Note.- This requires active intervention by the GFM.
5) The data entered into this register shall, whenever possible,
be derived from the sources that are controlling the aircraft.
6) All parameters shall be required except for inertial vertical
velocity which shall be supplied only by aircraft with a
suitable inertial source. If inertial vertical velocity is not
available, bits 46 to 56 inclusive shall be actively set to 0 by
the GFM.
7) The LSB of all fields shall be obtained by rounding
Annex 10 - Aeronautical Telecommunications
Table 2-97. BDS code 6,l - Emergencylpriority status
Volume XII
28/11/02
No. 77
MB
-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
-16
17
18
19
20
2 1
22
23
-24
25
26
27
28
29
30
3 1
32 -
33
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