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- 43 - TABLE 22 FREQUENCY OF VARIOUS FACTORS MENTIONED BY AIRLINE PILOTS AS CAUSES OF UNSAFE AIRLINE FLYING Causes of Unsafe Airline Flying Frequency A. Communications and Navigation Equipment 180 1. Approach Systems 67 a. Lack of I.L.S. 33 b. Inadequate G.C.A 27 c. Lack of new radar equipment 6 d. I.L.S. not reliable 1 2. Communication Equipment 50 a. Radio static 26 b. Poor Communications in General 9 c. Radio failures 9 d. Inefficient radios 6 3. Radio Ranges 49 a. V.H.F. ranges needed 26 b. Radio ranges not lined up with runways 7 c. Adcock ranges should replace loop type 5 d. Inadequate range stations 3 e. Radio ranges too close to airport 2 f. More than one range station on one frequency 1 g. Radio range not suitable for faster planes 1 h. V.H.F. changes without notice 1 i. More fan markers needed 1 j. Radio ranges too far from station 1 k. Poor radio range maintenance 1 4. Others 14 a. Inadequate navigational aids, in general 4 b. Radio facilities poor, in general 4 c. Lack of radio altimeters 3 d. Improper placement of navigational aids 1 e. Lack of airborne radar 1 f. Lack of gyro or flux-gate compasses 1 B. Airports 172 1. Inadequacies of Airport Lighting 80 a. Inadequate lighting 38 b. High intensity approach lights needed 21 c. High visibility contact lights needed along runway 20 d. Insufficient lights indicating pattern 1 2. Runways 37 a. Shorts Runways 24 b. Runways not free of rice, snow or water 8 c. Rough runways 3 d. Runways not in enough directions 2
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