TM 1-1510-262-10
i. Takeoff Path-One Engine Inoperative. Graphs are provided to estimate the horizontal distance required to
reach a height of 1500 feet, or the minimum climb gradient required to clear an obstacle along the takeoff light path.
If clearance of obstacles beyond the runway is required, these results may restrict takeoff weight accordingly.
The takeoff distance extends from brake release to reference zero, which is the point at which the aircraft is 50 feet
above the runway. The net takeoff light path begins at liftoff and consists of the following segments:
(1) The irst segment climb extends from liftoff to the point where the landing gear completes the retraction
cycle. The airspeed is maintained at V 2 .
(2) The second segment climb begins at the end of the irst segment and extends to 500 feet above the
runway. The airspeed during the second segment is V 2 .
(3) The acceleration and lap retraction segment consists of an acceleration from V 2 to V EMR at a constant
height of 500 feet. If a laps approach takeoff was made, begin lap retraction at V ENR .
(4) The third segment climb begins when one engine-inoperative climb speed is reached and laps are
fully retracted at 500 feet, and extends to 1500 feet above the runway. Airspeed is maintained at V ENR during this
segment.
j. Takeoff Path Proile (Flaps Approach, One Engine Inoperative). The following examples illustrate the use
of the laps-approach takeoff path graphs. Enter the graphs at 15C FAT, 3499 feet pressure altitude, 16,000 pounds
takeoff weight, 1.9% downhill runway gradient, and a 10-knot headwind component.
(1)
Example 1 Close-in obstacle clearance: given:
Obstacle Height Above Aircraft at Brake Release . . . . . . . . . . . . . . . . . . . . . . . . . .
88 feet
Obstacle Distance from Brake Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16,294 feet
1. The obstacle horizontal distance from reference zero equals the obstacle distance from brake release
less the accelerate-go distance to 50 feet AGL (16,294 ft - 5069 ft) = 11,225 feet = 1.85 nautical miles.
Figure 7-1. Takeoff Path Proile - One Engine Inoperative
7-16
