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Address 8 I13 - I20
Approach elevation antenna offset 10 –511 m to +511 m
(see Note 3)
1 m I21 - I30
MLS datum point to threshold
distance
10 0 m to 1 023 m 1 m I31 - I40
Approach elevation antenna height 7 –6.3 m to +6.3 m
(see Note 3)
0.1 m I41 - I47
MLS datum point elevation 13 –4 095 m to +4 095 m
(see Note 3)
1 m I48 - I60
Runway threshold height 7 –6.3 m to +6.3 m
(see Note 3)
0.1 m I61 - I67
SPARE 2 See Note 8 I68 - I69
PARITY 7 See Note 1 I70 - I76
A3 PREAMBLE (see Note 4) digital 1.0 12 See Note 6 I1 - I12
Address 8 I13 - I20
DME offset 12 –2 047 m to +2 047 m
(see Note 3)
1 m I21 - I32
DME to MLS datum point distance 14 –8 191 m to +8 191 m
(see Note 3)
1 m I33 - I46
Appendix A Annex 10 — Aeronautical Communications
APP A-9 23/11/06
Word Data content
Type
of
data
Maximum time
between
transmissions
(seconds)
Bits
used
Range of
values
Least
significant
bit
Bit
number
DME antenna height 7 –63 m to +63 m
(see Note 3)
1 m I47 - I53
Runway stop-end distance 14 0 m to 16 383 m 1 m I54 - I67
SPARE 2 See Note 8 I68 - I69
PARITY 7 See Note 1 I70 - I76
A4 PREAMBLE (see Note 5) digital 1.0 12 See Note 6 I1 - I12
Address 8 I13 - I20
Back azimuth antenna offset 10 –511 m to +511 m
(see Note 3)
1 m I21 - I30
Back azimuth to MLS datum
point distance
11 0 m to 2 047 m 1 m I31 - I41
Back azimuth alignment with
runway centre line
12 –20.47° to +20.47°
(see Notes 3 and 7)
0.01° I42 - I53
Back azimuth antenna
coordinate system
1 See Note 2 I54
Back azimuth antenna height 7 –63 m to +63 m
(see Note 3)
1 m I55 - I61
SPARE 8 See Note 8 I62 - I69
PARITY 7 See Note 1 I70 - I76
NOTES.—
1. Parity bits I70 to I76 are chosen to satisfy the equations which follow.
For bit I70
EVEN =(I13 + ... + I18) + I20 + I22 + I24 + I25 + I28 + I29 + I31 + I32 + I33 + I35 + I36
+ I38 + I41 + I44 + I45 + I46 + I50 + (I52 + ... + I55) + I58 + I60 + I64 + I65 + I70
For bit I71
EVEN =(I14 + ... + I19) + I21 + I23 + I25 + I26 + I29 + I30 + I32 + I33 + I34 + I36 + I37
+ I39 + I42 + I45 + I46 + I47 + I51 + (I53 + ... + I56) + I59 + I61 + I65 + I66 + I71
For bit I72
EVEN =(I15 + ... + I20) + I22 + I24 + I26 + I27 + I30 + I31 + I33 + I34 + I35 + I37 + I38
+ I40 + I43 + I46 + I47 + I48 + I52 + (I54 + ... + I57) + I60 + I62 + I66 + I67 + I72
For bit I73
EVEN =(I16 + ... + I21) + I23 + I25 + I27 + I28 + I31 + I32 + I34 + I35 + I36 + I38 + I39
+ I41 + I44 + I47 + I48 + I49 + I53 + (I55 + ... + I58) + I61 + I63 + I67 + I68 + I73
For bit I74
EVEN =(I17 + ... + I22) + I24 + I26 + I28 + I29 + I32 + I33 + I35 + I36 + I37 I39 + I40
+ I42 + I45 + I48 + I49 + I50 + I54 + (I56 + ... + I59) + I62 + I64 + I68 + I69 + I74
For bit I75
EVEN =(I13 + ... + I17) + I19 + I21 + I23 + I24 + I27 + I28 + I30 + I31 + I32 + I34 + I35 + I37
+ I40 + I43 + I44 + I45 + I49 + (I51 + ... + I54) + I57 + I59 + I63 + I64 + I69 + I75
For bit I76
EVEN =I13 + I14 + ... + I75 + I76
2. Code for antenna coordinate system is 0 = conical.
Annex 10 — Aeronautical Communications Volume I
23/11/06 APP A-10
3. The convention for the coding of negative numbers is as follows:
MSB is the sign bit:
0 = positive
1 = negative
Other bits represent the absolute value.
The convention for the antenna location is as follows:
As viewed from the MLS approach reference datum looking toward the MLS datum point, a positive number represents a location to the right of the
runway centre line (lateral offset) or above the runway (vertical offset), or towards the stop end of the runway (longitudinal distance).
The convention for the alignment is as follows:
As viewed from above, a positive number represents clockwise rotation from the runway centre line to the respective zero-degree azimuth.
4. Data word A3 is transmitted in both approach azimuth and back azimuth coverages if back azimuth guidance is provided, while retaining the maximum
specified time between transmissions in each coverage sector.
5. Data word A4 is transmitted in both approach azimuth and back azimuth coverages if back azimuth guidance is provided, while retaining the maximum
specified time between transmissions in each coverage sector.
6. The 12 data bits of the preamble are preceded by an 0.832 millisecond interval (13 clock pulses) of CW for carrier acquisition (see Table A-1).
7. See Table A-12 for data words B42 and B43 which are defined for applications that require azimuth antenna rotation greater than the +20.47° supported
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