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used
Least
significant
bit
Bit
number
Secondary runway threshold
Z coordinate
8 ±127 m 1 m I51 - I58
Secondary runway threshold
crossing height
5 0 to 31 m 1 m I59 - I63
Virtual azimuth to secondary
runway threshold distance
6 0 to 6 300 m 100 m I64 - I69
PARITY 7 see Note 1 I70 - I76
Words B55 through B64: Time-varying data items. (Note.— Word B55 only is defined below.)
B55 PREAMBLE digital 10.0 12 see Note 6 I1 - I12
Address 8 I13 - I20
RVR (touchdown zone) 11 0 - 2 555 m
(see Note 3)
5 m I21 - I31
RVR (mid-point) 11 0 - 2 555 m
(see Note 3)
5 m I32 - I42
RVR (stop end) 11 0 - 2 555 m
(see Note 3)
5 m I43 - I53
Surface wind speed 7 0 - 127 kt 1 kt I54 - I60
Surface wind direction (magnetic) 9 0 - 359° 1° I61 - 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
Appendix A Annex 10 — Aeronautical Communications
APP A-15 23/11/06
For bit I76
EVEN = I13 + I14 + ... + I75 + I76
2. 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 guidance radial.
The convention for geodetic coordinates is as follows:
A positive number represents a northern latitude or eastern longitude.
A negative number represents a southern latitude or western longitude.
3. The tenth and eleventh bits transmitted for each RVR value are used to provide trend information. The convention for coding is as follows:
Tenth bit Eleventh bit
Off 0 0
Decreasing 1 0
Equal 0 1
Increasing 1 1
4. When used, data word B43 is transmitted in both approach azimuth and back azimuth coverage sectors if back azimuth guidance is provided, while
retaining the specified maximum time between transmissions in each area.
5. Data words B42 and B43 are defined for applications that require azimuth antenna rotation greater than the 20.47° supported by the data items in A1,
for azimuth, and A4, for back azimuth. At a facility with approach azimuth rotation greater than 20.47°, B42 is transmitted in place of A1. At a facility
with the back azimuth rotation greater than 20.47°, B43 is transmitted in place of A4.
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. The convention for coding is as follows:
0 = no letter
1 = R (right)
2 = C (centre)
3 = L (left)
8. The convention for coding is as follows:
0 = not provided
1 = raw elevation guidance
2 = computed glide path
3 = code not allowed
9. All spare bits are set to ZERO.
10. Runway number designation 0 is for heliport operations.
Annex 10 — Aeronautical Communications Volume I
Table A-13. Definitions of auxiliary data B items
concerning MLS/RNAV procedure database
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