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be as defined in the table below:
Bit 1 Bit 2
0 0 NIL
0 1 LIGHT
1 0 MODERATE
1 1 SEVERE
The definition of the terms LIGHT, MODERATE and SEVERE
shall be those defined in the PANS-ATM (Doc 4444), where
applicable.
RESERVED
28/11/02
No. 77
Annex 10 - Aeronautical Telecontmunications Volurne ZZZ
Table 2-72. BDS code 4,8 - VHF channel report
MB FIELD
PURPOSE: To allow the ATC system to monitor the settings of the VHF
communications channel and to determine the manner in which each
channel is being monitored by the aircrew,
VHF 1
STATUS
VHF 1
- AUDIO STATUS
VHF 2
STATU S
AUDIO STATUS
VHF 3
AUDIO STATUS
55 121.5 MHz
56 AUDIO STATUS
Channel report coding:
Each VHF mmmunications channel shall be determined from the 15-bit
positive binary number, N in kHz, according to the formula.
Channel (MHz ) = Base + N x 0.001 (MHz)
where Base = 118.000 MHz
Notes.-
I) The use of binary to define the channel improves the coding
efficiency.
2) This coding is compatible with analogue channels on 25 kHz,
8.33 kHz channel spacing and VDL as described below.
3) VDL has a full four bits allocated such that the active status of each
of its four multiplex channels can be ascertained.
25 kHz VDL: Mode 3
25 k ~aznal ogue
Bit
16
15
. . .
6
5
4
3
2
1
I Bit I I
Status
MSB (12 800 kHz)
range 118.000 to 143.575
136.975 (military uses)
LSB (25 kHz)
4 x channel active flags
VDL indicator = 1
range 118.000 to 143.575
136.975 (military uses)
LSB (25 kHz)
unused
8.33 kHz analogue
4
3
2
1
unused
unused
8.33 indicator = 0
VDL ind~cator = 0
--AI
, r 1 ILSB
Bit
-a- 16
15
...
- - . . - - - -
2 1 8.33 indicator = 1 -
1 I VDL indicator = 0
Status
MSB (17 066 kHz)
range 118.000 to 152.112
136.975 (militanr uses)
Audio status coding:
Each pair of audio status bits shall be used to describe the aircrew
monitoring of that audio channel according to the following table:
UNKNOWN -
NOBODY
HEADPHONES ONLY
1 LOUDSPEAKER
2811 1/02
No. 77
Part I Annex 10 - Aeronautical Telecarnrnur~icatio~ts
Table 2-80. BDS code 5,O - Track and turn report
MB FIELD
1 1 STATUS I --
SIGN 1 = Left (left wing down)
MSB = 45 degrees
I ROLL ANGLE I Range = [-go, +90]
LSB = 451256 degrees
STATUS
SlGN 1 = West (e.g. 315" = -45")
MSB = 90 degrees
TRUE TRACK ANGLE
Range = [-180, +la01
LSB = 90!512 degrees
STATUS
MSB = 1 024 kt
GROUND SPEED
Range = [O, 2 0461
LSB = 1 024/512 kt
STATUS
SlGN 1 = Minus
MSB = 8 degreesfsecond
TRACK ANGLE RATE
Range = [-16. +16]
LSB = 8/256 degreeslsecond
STATUS
MSB = 1 024 kt
TRUE AIRSPEED
Range = [O, 2 0461
PURPOSE: To provide track and turn data to the ground
systems.
1) The maximum acceptable data age at time of transmission
to the ground shall be 1 second for 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.
Note.- This applies if any parameter becomes
unavailable due to abnormal operations.
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) If any parameter is not available on an aircraft, all bits
corresponding to that parameter shall be actively set to 0 by
the BDS servicing process.
7) The LSB of all fields shall be obtained by rounding.
-28-/1 1/02
No. 77
Annex 10 - Aeronuuticul Telecornmurzkati~ns Volume I11
Table 2-81. BDS code 5,l - Position report coarse
MB FIELD
STATUS (see 1)
SIGN
MSB = 90 degrees
-
LATITUDE
Range = [-180, +I801
(see 2)
PURPOSE: To provide a three-dimensional report of aircraft
position.
1) The single status bit (bit 1) shall be set to 0 if any of the
　
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