Section 171.311 14 CFR Ch. I (1-1-19 Edition) TABLE 8a - BASIC DATA WORDS - Continued Data bit # Data item definition LSB value TABLE 8a - BASIC DATA WORDS - Continued Data bit value Data bit # 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. Preamble ......................... N/A 1 .......................................... ............ 1 .......................................... ............ 1 .......................................... ............ 0 .......................................... ............ 1 .......................................... ............ 1 .......................................... ............ 0 .......................................... ............ 0 .......................................... ............ 0 .......................................... ............ 1 .......................................... ............ 0 .......................................... ............ 0 Approach azimuth mag1Section 1Section netic orientation (0Section to 359Section). 14 .......................................... ............ 2Section 15 .......................................... ............ 4Section 16 .......................................... ............ 8Section 17 .......................................... ............ 16Section 18 .......................................... ............ 32Section 19 .......................................... ............ 64Section 20 .......................................... ............ 128Section 21 .......................................... ............ 256Section 22 Back azimuth magnetic 1Section 1Section orientation (0Section to 359Section). 23 .......................................... ............ 2Section 24 .......................................... ............ 4Section 25 .......................................... ............ 8Section 26 .......................................... ............ 16Section 27 .......................................... ............ 32Section 28 .......................................... ............ 64Section 29 .......................................... ............ 128Section 30 .......................................... ............ 256Section 31 Parity: (13 + 14 + 15. . . N/A N/A + 30 + 31 = odd). 32 Parity: (14 + 16 + 18. . . N/A N/A + 30 + 32 = odd). Note 1: Transmit at intervals of 1.0 second or less throughout 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. 6 1 2 3 4 5 6 7 8 9 10 11 12 (13- 30) 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Basic Data Word No. 5 14 15 N/A ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ 2Section 1 1 1 0 1 1 1 0 1 1 0 0 Section2Section ............ ............ Section4Section Section8Section 32 Preamble ......................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... MLS ground equipment identification (Note 3). Character 2 ...................... .......................................... .......................................... .......................................... .......................................... .......................................... Character 3 ...................... .......................................... .......................................... .......................................... .......................................... .......................................... Character 4 ...................... .......................................... .......................................... .......................................... .......................................... .......................................... Parity: (13 + 14 + 15. . . + 30 + 31 = odd). Parity: (14 + 16 + 18. . . + 30 + 32 = odd). N/A ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ 1 1 1 0 1 0 0 0 1 1 0 1 N/A ............ ............ ............ ............ ............ N/A ............ ............ ............ ............ ............ N/A ............ ............ ............ ............ ............ N/A B1 B2 B3 B4 B5 B6 B1 B2 B3 B4 B5 B6 B1 B2 B3 B4 B5 B6 N/A N/A N/A Note 1: Transmit at intervals of 1.0 second or less throughout the Approach Azimuth guidance sector, except when Back Azimuth guidance is provided. See note 8. 862 VerDate Sep<11>2014 08:20 May 17, 2019 Jkt 247048 PO 00000 Frm 00872 Data bit value .......................................... ............ Section16Section .......................................... ............ Section32Section Back azimuth proportional 2Section 2Section coverage positive limit (0Section to + 42Section). 19 .......................................... ............ 4Section 20 .......................................... ............ 8Section 21 .......................................... ............ 16Section 22 .......................................... ............ 32Section 23 Back azimuth beamwidth 0.5Section 0.5Section (0.5Section to 4.0Section) See note 7. 24 .......................................... ............ 1.0Section 25 .......................................... ............ 2.0Section 26 Back azimuth status ........ ............ See Note 10 27 ......do ............................... ............ Do. 28 ......do ............................... ............ Do. 29 ......do ............................... ............ Do. 30 ......do ............................... ............ Do. 31 Parity: (13 + 14 + 15. . . N/A N/A + 30 + 31 = odd). 32 Parity: (14 + 16 + 18. . . N/A N/A + 30 + 32 = odd). Note 1: Transmit only when Back Azimuth guidance is provided. 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. 1 2 3 4 5 6 7 8 9 10 11 12 13 Preamble ......................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... Back azimuth proportional coverage negative limit (0Section to Section42Section). .......................................... .......................................... LSB value 16 17 18 Basic Data Word No. 4 1 2 3 4 5 6 7 8 9 10 11 12 13 Data item definition Fmt 8010 Sfmt 8010 Y:\SGML\247048.XXX 247048