Technical Provisions for Mode S Services and Extended Squitter

Appendix A A-71
MB FIELD
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
1 STATUS
2 MSB TURBULENCE
3 LSB
4 STATUS
5 MSB WIND SHEAR
6 LSB
Table A-2-69. BDS code 4,5 — Meteorological hazard report
PURPOSE: To provide reports on the severity of meteorological hazards, in
particular for low flight.
Hazard coding:
The interpretation of the two bits assigned to each hazard shall be as
defined in the table below:
7 STATUS Bit 1 Bit 2
8 MSB MICROBURST 0 0 NIL
9 LSB 0 1 LIGHT
10 STATUS 1 0 MODERATE
11 MSB ICING 1 1 SEVERE
12 LSB
13 STATUS
The definition of the terms LIGHT, MODERATE and SEVERE shall be those
14 MSB WAKE VORTEX
defined in the PANS-ATM (Doc 4444), where applicable.
15
16
LSB
STATUS
Note 1.— The requirement for the range of static air temperature in
Annex 3 is from –80° C to +60° C.
17 SIGN
18
19
MSB = 64°C
Note 2.— Two’s complement coding is used for all signed fields as
specified in §A.2.2.2.
20
21
STATIC AIR TEMPERATURE
22
23
24
25
Range = [–128, +128] °C
26 LSB = 0.25°C
27 STATUS
28
29
30
31
MSB = 1 024 hPa
32
33
AVERAGE STATIC PRESSURE
34
35
36
37
Range = [0, 2 048] hPa
38 LSB = 1 hPa
39 STATUS
40
41
42
43
MSB = 32 768 feet
44
45
RADIO HEIGHT
46
47
48
49
50
Range = [0, 65 528] ft
51
52
53
LSB = 16 ft
54
55
56
RESERVED
Draft
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris