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End function (airborne) 5.356
End guard time; end function (ground) 5.600
* The actual commencement and completion of the TO and FRO scan transmissions are dependent on the amount of
proportional guidance provided. The time slots provided will accommodate a maximum scan of minus 1.5 degrees
to plus 29.5 degrees. Scan timing shall be compatible with accuracy requirements.
Table A-5. Flare function timing
(see 3.11.4.3.4)
Event time slot begins at
Event
15.625 kHz
Clock pulse
(number)
Time
(milliseconds)
Preamble 20 0
Processor pause 25 1.600
TO scan* 29 1.856
Pause 3.056
Midscan point 3.456
FRO scan* 3.856
End function (airborne) 5.056
End guard time; end function (ground) 5.300
* The actual commencement and completion of the TO and FRO scan transmissions are dependent on the amount of
proportional guidance provided. The time slots provided will accommodate a maximum scan of minus 2.0 degrees
to plus 10.0 degrees. Scan timing shall be compatible with accuracy requirements.
APP A-3 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table A-6. Basic data function timing
(see 3.11.4.3.4)
Event time slot begins at
Event
15.625 kHz
Clock pulse
(number)
Time
(milliseconds)
Preamble 20 0
Data transmission (Bits I13 - I30) 24 1.600
Parity transmission (Bits I31 - I32) 43 2.752
End function (airborne) 45 2.880
End guard time; end function (ground) 3.100
Table A-7. Basic data
(see 3.11.4.8.2.1)
Word Data content
Maximum time
between
transmissions
(seconds) Bits used
Range of
values
Least
significant
bit
Bit
number
1 PREAMBLE
1.0 12 see Note 10 I1 - I12
Approach azimuth antenna to
threshold distance
6 0 m to 6 300 m 100 m I13 - I18
Approach azimuth proportional
guidance sector negative limit
5 0° to 60°
(see Note 11)
2° I19 - I23
Approach azimuth proportional
guidance sector positive limit
5 0° to 60°
(see Note 11)
2° I24 - I28
Clearance signal type
1 see Note 9 I29
SPARE
1 see Note 12 I30
PARITY
2 see Note 1 I31 - I32
2 PREAMBLE
0.16 12 see Note 10 I1 - I12
Minimum glide path 7 2° to 14.7° 0.1° I13 - I19
Back azimuth status 1 see Note 2 I20
DME status
2 see Note 7 I21 - I22
Approach azimuth status
1 see Note 2 I23
Approach elevation status
1 see Note 2 I24
SPARE
6 see Notes 6 and 12 I25 - I30
PARITY
2 see Note 1 I31 - I32
23/11/06 APP A-4
Appendix A Annex 10 — Aeronautical Communications
Word Data content
Maximum time
between
transmissions
(seconds) Bits used
Range of
values
Least
significant
bit
Bit
number
3 PREAMBLE
1.0 12 see Note 10 I1 - I12
Approach azimuth beamwidth 3 0.5° to 4°
(See Note 8)
0.5° I13 - I15
Approach elevation beamwidth 3 0.5° to 2.5°
(See Note 8)
0.5° I16 - I18
DME distance
9 0 m to 6 387.5 m 12.5 m I19 - I27
SPARE
3 see Note 12 I28 - I30
PARITY
2 see Note 1 I31 - I32
4 PREAMBLE
1.0 12 see Notes 4 and 10 I1 - I12
Approach azimuth magnetic
Orientation
9 0° to 359° 1° I13 - I21
Back azimuth magnetic orientation
9 0° to 359° 1° I22 - I30
PARITY
2 see Note 1 I31 - I32
5 PREAMBLE
1.0 12 see Notes 5 and 10 I1 - I12
Back azimuth proportional guidance
sector negative limit
5 0° to 40°
(see Note 11)
2° I13 - I17
Back azimuth proportional guidance
sector positive limit
5 0° to 40°
(see Note 11)
2° I18 - I22
Back azimuth beamwidth 3 0.5° to 4.0°
(see Note 8)
0.5° I23 - I25
Back azimuth status
1 see Note 2 I26
SPARE
4 see Notes 3 and 12 I27 - I30
PARITY
2 see Note 1 I31 - I32
6 PREAMBLE
1.0 12 see Notes 4 and 10 I1 - I12
MLS ground equipment
Identification
Letters A to Z
Character 2
6 I13 - I18
Character 3
6 I19 - I24
Character 4
6 I25 - I30
PARITY 2 see Note 1 I31 - I32
APP A-5 23/11/06
Annex 10 — Aeronautical Communications Volume I
NOTES.—
1. Parity bits I31 and I32 are chosen to satisfy the equations:
I13 + I14 ... + I29 + I30 + I31 = ODD
I14 + I16 + I18 ... + I28 + I30 + I32 = ODD.
2. Coding for status bit:
0 = function not radiated, or radiated in test mode (not reliable for navigation);
　
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