862
14 CFR Ch. I (1–1–19 Edition)
§ 171.311
T
ABLE
8a—B
ASIC
D
ATA
W
ORDS
—Continued
Data bit
#
Data item definition
LSB
value
Data bit
value
Note 1:
Transmit throughout the Approach Azimuth guidance
sector at intervals of 1.0 seconds or less.
Note 2:
The all zero state of the data field represents the
lower limit of the absolute range of the coded parameter
unless otherwise noted.
Basic Data Word No. 4
1 Preamble .........................
N/A
1
2 ..........................................
............
1
3 ..........................................
............
1
4 ..........................................
............
0
5 ..........................................
............
1
6 ..........................................
............
1
7 ..........................................
............
0
8 ..........................................
............
0
9 ..........................................
............
0
10 ..........................................
............
1
11 ..........................................
............
0
12 ..........................................
............
0
13
Approach azimuth mag-
netic orientation (0
°
to
359
°
).
1
°
1
°
14 ..........................................
............
2
°
15 ..........................................
............
4
°
16 ..........................................
............
8
°
17 ..........................................
............
16
°
18 ..........................................
............
32
°
19 ..........................................
............
64
°
20 ..........................................
............
128
°
21 ..........................................
............
256
°
22
Back azimuth magnetic
orientation (0
°
to 359
°
).
1
°
1
°
23 ..........................................
............
2
°
24 ..........................................
............
4
°
25 ..........................................
............
8
°
26 ..........................................
............
16
°
27 ..........................................
............
32
°
28 ..........................................
............
64
°
29 ..........................................
............
128
°
30 ..........................................
............
256
°
31
Parity: (13 + 14 + 15. . .
+ 30 + 31 = odd).
N/A N/A
32
Parity: (14 + 16 + 18. . .
+ 30 + 32 = odd).
N/A N/A
Note 1:
Transmit at intervals of 1.0 second or less through-
out the Approach Azimuth guidance sector, except when
Back Azimuth guidance is provided. See Note 8.
Note 2:
The all zero state of the data field represents the
lower limit of the absolute range of the coded parameter
unless otherwise noted.
Basic Data Word No. 5
1 Preamble .........................
N/A
1
2 ..........................................
............
1
3 ..........................................
............
1
4 ..........................................
............
0
5 ..........................................
............
1
6 ..........................................
............
1
7 ..........................................
............
1
8 ..........................................
............
0
9 ..........................................
............
1
10 ..........................................
............
1
11 ..........................................
............
0
12 ..........................................
............
0
13
Back azimuth proportional
coverage negative limit
(0
°
to
¥
42
°
).
2
°
¥
2
°
14 ..........................................
............
¥
4
°
15 ..........................................
............
¥
8
°
T
ABLE
8a—B
ASIC
D
ATA
W
ORDS
—Continued
Data bit
#
Data item definition
LSB
value
Data bit
value
16 ..........................................
............
¥
16
°
17 ..........................................
............
¥
32
°
18
Back azimuth proportional
coverage positive limit
(0
°
to + 42
°
).
2
°
2
°
19 ..........................................
............
4
°
20 ..........................................
............
8
°
21 ..........................................
............
16
°
22 ..........................................
............
32
°
23
Back azimuth beamwidth
(0.5
°
to 4.0
°
) See note
7.
0.5
°
0.5
°
24 ..........................................
............
1.0
°
25 ..........................................
............
2.0
°
26
Back azimuth status ........
............
See Note 10
27 ......do ...............................
............
Do.
28 ......do ...............................
............
Do.
29 ......do ...............................
............
Do.
30 ......do ...............................
............
Do.
31
Parity: (13 + 14 + 15. . .
+ 30 + 31 = odd).
N/A N/A
32
Parity: (14 + 16 + 18. . .
+ 30 + 32 = odd).
N/A N/A
Note 1:
Transmit only when Back Azimuth guidance is pro-
vided. See note 9.
Note 2:
The all zero state of the data filed represents the
lower limit of the absolute range of the coded parameter
unless otherwise noted.
Basic Data Word No. 6
1 Preamble .........................
N/A
1
2 ..........................................
............
1
3 ..........................................
............
1
4 ..........................................
............
0
5 ..........................................
............
1
6 ..........................................
............
0
7 ..........................................
............
0
8 ..........................................
............
0
9 ..........................................
............
1
10 ..........................................
............
1
11 ..........................................
............
0
12 ..........................................
............
1
(13–
30)
MLS ground equipment
identification (Note 3).
............
13 Character
2 ......................
N/A
B1
14 ..........................................
............
B2
15 ..........................................
............
B3
16 ..........................................
............
B4
17 ..........................................
............
B5
18 ..........................................
............
B6
19 Character
3 ......................
N/A
B1
20 ..........................................
............
B2
21 ..........................................
............
B3
22 ..........................................
............
B4
23 ..........................................
............
B5
24 ..........................................
............
B6
25 Character
4 ......................
N/A
B1
26 ..........................................
............
B2
27 ..........................................
............
B3
28 ..........................................
............
B4
29 ..........................................
............
B5
30 ..........................................
............
B6
31
Parity: (13 + 14 + 15. . .
+ 30 + 31 = odd).
N/A N/A
32
Parity: (14 + 16 + 18. . .
+ 30 + 32 = odd).
N/A N/A
Note 1:
Transmit at intervals of 1.0 second or less through-
out the Approach Azimuth guidance sector, except when Back
Azimuth guidance is provided. See note 8.
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