![]() This requirement does not apply to offset azimuth installations. (i) Proportional guidance horizontally within a sector 45 meters (150 feet) each side of the runway centerline beginning at the stop end and extending parallel with the runway centerline in the direction of the approach to join the approach region. (iii) Where intervening obstacles penetrate the lower surface, coverage need be provided only to the minimum line of sight. (ii) A conical surface originating at the azimuth ground equipment antenna inclined at 15 degrees above the horizontal to a height of 6,000 meters (20,000 feet). (i) A conical surface originating 2.5 meters (8 feet) above the runway centerline at threshold inclined at 0.9 degree above the horizontal. For systems providing ☖0° lateral guidance the coverage requirement is reduced to 14 nm beyond ±40°. When intervening obstacles prevent full coverage, the ±40° guidance sector can be reduced as required. Clearance signals must be used to provide the balance of the required coverage, where the proportional sector is less than plus or minus 40 degrees. The minimum proportional guidance sector must be plus or minus 10 degrees about the runway centerline. (1) Horizontally within a sector plus or minus 40 degrees about the runway centerline originating at the datum point and extending in the direction of the approach to 20 nautical miles from the runway threshold. Note 6: The designation “A1” represents the function identification code for “Auxiliary Data A” and address code number 1. Note 5: When back Azimuth guidance is provided, transmit at intervals of 1.33 seconds or less throughout the back Azimuth coverage sector and 4.0 seconds or less throughout the approach Azimuth coverage sector. Where back Azimuth is provided transmit at intervals of 1.33 seconds or less throughout the approach Azimuth sector and 4.0 seconds or less throughout the back Azimuth coverage sector. ![]() Note 4: Data Word A3 is transmitted at intervals of 1.0 seconds or less throughout the approach Azimuth coverage sector, except when back Azimuth guidance is provided. The convention for the antenna alignment is as follows: As viewed from above, a positive number shall represent clockwise rotation from the runway centerline to the respective zero-degree guidance plane. The convention for the antenna location is as follows: As viewed from the MLS approach reference datum looking toward the datum point, a positive number shall represent a location to the right of the runway centerline (lateral offset) or above the runway (vertical offset), or towards the stop end of the runway (longitudinal distance). Other bits represent the absolute value. Note 3: The convention for the coding of negative numbers is as follows: − MSB is the sign bit 0 = + 1 = −. Note 2: Code for I 56is: 0 = conical 1 = planar. Note 1: Parity bits I 70to I 76are chosen to satisfy the equations which follow:Įven = (I 13+. Maximun time between transmissions (Seconds)Īpproach azimuth to MLS datum point distanceĪpproach azimuth antenna alignment with runway centerlineĪpproach azimuth antenna coordinate systemīack azimuth antenna alignment with runway centerline Note 1: Parity bits I 19and I 20are chosen to satisfy the equations:
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