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Approach
azimuth
map/CRC
I66-69 Spare zeros 0000
B39 I21-24 Number of procedure descriptors 1 1000
I25-30 First back azimuth database word 36 100100
(Note 2)
I31-62 CRC code See Table G-9
I63 Word B43 transmitted No 0
I64-68 Spare zeros 00000
Back azimuth
map/CRC
(Note 3)
I69 Back azimuth map/CRC indicator map/CRC 1
NOTES.—
1. Bit coding is indicated with the lower bit number on the left.
2. Data word addresses are as defined in Table A-9, Appendix A with the most significant bit first.
3. Facility without back azimuth database may employ all words up to B39 for the approach azimuth database.
ATT G-47 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table G-6. Example of procedure descriptor word assignments
Procedure descriptor data words
KASEL NELSO SEMOR LAWSO
B2 B3 B4 B36
Data item
Bit
numbers Value Coded Value Coded Value Coded Value Coded
Basic indicator (first character) I21-I25 K 11010 N 01110 S 11001 L 00110
Second character I26-I30 A 10000 E 10100 E 10100 A 10000
Third character I31-I35 S 11001 L 00110 M 10110 W 11101
Fourth character I36-I40 E 10100 S 11001 O 11110 S 11001
Fifth character I41-I45 L 00110 O 11110 R 01001 O 11110
Validity indicator I46-I49 1 1000 1 1000 1 1000 6 0110
Route indicator I50-I54 A 10000 B 01000 C 11000 D 00100
Runway number I55-I60 23 111010 23 111010 26 010110 23 111010
Runway letter I61-I62 R 10 R 10 – 00 R 10
Procedure type I63 APP 0 APP 0 APP 0 DEP 1
First way-point index I64-I69 1 100000 4 001000 5 101000 1 100000
Note.— Bit coding is indicated with the lower bit number on the left.
23/11/06 ATT G-48
Attachment G Annex 10 — Aeronautical Communications
Table G-7. Example of way-point assignments for MLS/RNAV approach procedures
Procedure Data Bit
name word numbers Data item Value Value
WP
Index
KASEL B5 I21-35 WP 4 – X coordinate 8 200 m 110000010011000 1
I36 Y coordinate follows Yes 1
I37-51 WP 4 – Y coordinate –9 094 m 000001111011001
I52 Z coordinate follows No 0
I53-55 Next segment/field identifier straight = 0 000
I56-69 WP 3 – X coordinate (first 14 bits) 9 954 m 00001100111100 2
B6 I21 WP 3 – X coordinate (last bit) 0
I22 Y coordinate follows Yes 1
I23-37 WP 3 – Y coordinate –5 336 m 001001000001001
I38 Z coordinate follows Yes 1
I39-51 WP 3 – Z coordinate 789 m 1001111011000
I52-54 Next segment field/identifier curved = 1 100
I55-69 WP 2 – X coordinate 6 556 m 100000000101000 3
B7 I21 Y coordinate follows No 0
I22 Z coordinate follows Yes 1
I23-35 WP 2 – Z coordinate 344 m 0011110110000
I36-38 Next segment/field identifier 5 101
I39-44 Threshold way-point height 16.8 m 010001
I45-50 Missed approach index 7 111000
NELSO I51-65 WP 3 – X coordinate 9 742 m 101110110111000 4
I66 Y coordinate follows Yes 1
I67-69 WP 3 – Y coordinate (first 3 bits) 6 499 m 110
B8 I21-32 WP 3 – Y coordinate (last 12 bits) 101111001000
I33 Z coordinate follows Yes 1
I34-46 WP 3 – Z coordinate 819 m 1110100111000
I47-49 Next segment/field identifier shared = 3 110
I50-55 Next way-point index 3 110000
SEMOR I56-69 WP 2 – X coordinate (first 14 bits) 5 567 m 11111110000100 5
B9 I21 WP 2 – X coordinate (last bit) 0
I22 Y coordinate follows Yes 1
I23-37 WP 2 – Y coordinate –5 276 m 101100000001001
I38 Z coordinate follows Yes 1
I39-51 WP 2 – Z coordinate 346 m 0111110110000
I52-54 Next segment/field identifier straight = 0 000
I55-69 WP 1 – X coordinate 159 m 011111000000000 6
B10 I21 Y coordinate follows Yes 1
I22-36 WP 1 – Y coordinate –2 401 m 010101011100001
I37 Z coordinate follows Yes 1
ATT G-49 23/11/06
Annex 10 — Aeronautical Communications Volume I
Procedure
name
Data
word
Bit
numbers Data item Value Value
WP
Index
I38-50 WP 1 – Z coordinate 16 m 0010111000000
I51-53 Next segment/field identifier 6 011
I54-59 Virtual azimuth distance 3 000 m 011110
I60-69 WP 2 – X coordinate Missed (first 10 bits) –7 408 m 0111001011 7
Approach B11 I21-25 WP 2 – X coordinate (last 5 bits) 01001
I26 Y coordinate follows No 0
I27 Z coordinate follows No 0
I28-30 Next segment/field identifier straight = 0 000
I31-45 WP 1 – X coordinate 0 000000000000000 8
I46 Y coordinate follows No 0
I47 Z coordinate follows No 0
I48-50 Next segment/field identifier 6 011
I51-69 Spare zeros 000...000
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