An aircraft has a climb gradient of 7 percent after take-off. There is an obstacle having a height of 320ft at a distance of 5400ft from the screen. The aircraft will clear the obstacle by:
For obstacle clearance, screen height = 50 ft
Climb gradient = 7% after take off i.e. after reaching screen height the a/c will climb 7 ft for every 100 ft horizontal.
At 5400 ft from screen height, height of a/c =50 + [(7 x 5400)/100] = 50 + 378 = 428 ft
obstacle height = 320 ft
clearance = 428 - 320 = 108 ft