Federal Aviation Administration, DOT Section 171.311 TABLE 8a - BASIC DATA WORDS Data bit # Data item definition LSB value TABLE 8a - BASIC DATA WORDS - Continued Data bit value Data bit # Basic Data Word No. 1 1 2 3 4 5 6 7 8 9 10 11 12 13 N/A ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ 100m 1 1 1 0 1 0 1 0 1 0 0 0 100m ............ ............ ............ ............ ............ 2Section 200m 400m 800m 1600m 3200m Section2Section ............ ............ ............ ............ 2Section Section4Section Section8Section Section16Section Section32Section 2Section 25 26 27 28 29 Preamble ......................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... Approach azimuth to threshold distance (OmSection630m). .......................................... .......................................... .......................................... .......................................... .......................................... Approach azimuth proportional coverage limit (negative limit) (0Section to Section62Section). .......................................... .......................................... .......................................... .......................................... Approach azimuth proportional coverage limit (positive limit) (0Section to + 62Section). .......................................... .......................................... .......................................... .......................................... Clearance signal type ...... ............ ............ ............ ............ N/A 30 Spare ............................... ............ 4Section 8Section 16Section 32Section 0 = pulse; 1 = SB Transmit zero N/A 14 15 16 17 18 19 20 21 22 23 24 31 .......................................... .......................................... .......................................... Back azimuth status ........ DME status ...................... .......................................... Approach azimuth status Approach azimuth status Spare ............................... ............ ............ ............ ............ ............ ............ ............ ............ ............ 26 27 28 29 30 31 ......do ............................... ......do ............................... ......do ............................... ......do ............................... ......do ............................... Parity: (13 + 14 + 15. . . + 30 + 31) = odd). Parity: (14 + 16 + 18. . . + 30 + 32 = odd). ............ ............ ............ ............ ............ N/A 14 15 16 17 18 19 N/A ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ 0.1Section 1 1 1 0 1 0 1 1 1 1 0 0 0.1Section ............ ............ ............ 0.2Section 0.4Section 0.8Section N/A 20 21 22 23 24 25 26 27 28 29 30 31 32 Preamble ......................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... Approach azimuth beamwidth (0.5SectionSection4.0Section) See note 7. .......................................... .......................................... Approach elevation beamwidth (0.5Section to 2.5Section) See note 7. .......................................... Note: values greater than 2.5Section are invalid. DME distance (Om to 6387.5m. .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... Spare ............................... 08:20 May 17, 2019 Jkt 247048 PO 00000 Frm 00871 see note 4 see note 4 Transmit zero Do. Do. Do. Do. Do. N/A N/A ......do ............................... ......do ............................... Parity: (13 + 14 + 15. . . + 30 + 31 = odd). Parity: (14 + 16 + 18. . . + 30 + 32 = odd). N/A ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ 0.5Section 1 1 1 0 1 1 0 1 0 0 0 0 0.5Section ............ ............ 0.5Section 1.0Section 2.0Section 0.5Section ............ ............ 1.0Section 2.0Section 12.5m ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ N/A 861 VerDate Sep<11>2014 1.6Section 3.2Section 6.4Section see note 4 see note 6 Basic Data Word No. 3 1 2 3 4 5 6 7 8 9 10 11 12 13 Basic Data Word No. 2 14 15 16 17 18 19 20 21 22 23 24 25 Data bit value Note 1: Transmit throughout the Approach Azimuth guidance sector at intervals of 0.16 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. Parity: (13 + 14 + 15. . . N/A + 30 + 31 = odd). Parity: (14 + 16 + 18. . . N/A N/A + 30 + 32 = odd). 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 value of the coded parameter unless otherwise noted. Preamble ......................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... .......................................... Minimum glide path (2.0Section to 14.7Section). .......................................... .......................................... .......................................... LSB value 32 32 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 12.5m 25.0m 50.0m 100.0m 200.0m 400.0m 800.0m 1600.0m 3200.0m Transmit zero Do. Do. N/A