867 

Federal Aviation Administration, DOT 

§ 171.313 

(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. The minimum 
proportional guidance sector must be 
plus or minus 10 degrees about the run-

way centerline. Clearance signals must 
be used to provide the balance of the 
required coverage, where the propor-
tional sector is less than plus or minus 
40 degrees. When intervening obstacles 
prevent full coverage, the 

±

40

° 

guidance 

sector can be reduced as required. For 
systems providing 

±

60

° 

lateral guidance 

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