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Charts are presented for determining the horizontal distance required to accelerate from V2 to
VSE at 1500 feet above-ground-level. Upon reaching 1500 feet AGL, the aircraft should first be
accelerated to V2 +10 KCAS before flap retraction is initiated. The distances are based on one
engine inoperative with the remaining engine at takeoff rated thrust, and are computed for net
acceleration capability (i.e., acceleration rate reduced by equivalent of 1.1% climb gradient). The
altitude of 1500-ft AGL must also be maintained during the acceleration. (Note: During 1500-ft
AGL acceleration, ensure that all obstacles at or just below 1500 feet AGL are cleared by a
height of at least 35 feet vertically.)
Computed values from the acceleration distance charts may be directly linked with distances
required to reach 1500-ft AGL to compute total distance from Reference Zero to the point of start
climb at VSE. The maximum distance available for climb over a distant enroute obstacle can
then be determined for use in computing the minimum enroute climb gradient required. The
following example based on the same takeoff conditions as the preceding net takeoff analysis
(but with a different obstacle) illustrates the procedure.
EXAMPLE: Find minimum enroute climb gradient required to clear distant obstacle:
Given: Airport Ambient Temperature............................................................................-5°C
Airport Pressure Altitude ........................................................................... 6000 feet
Flaps .....................................................................................................................20°
Obstacle: 125,000 feet (38,110 m) horizontal distance from the brake release
point and 2000 feet (610 m) above the brake release point.
Takeoff gross weight...................................................... 63,000 pounds (28,580 kg)
Runway Slope .......................................................................................+1% (uphill)
Headwind .....................................................................................................10 knots
Runway Length .......................................................................... 7000 feet (2134 m)
Stopway ........................................................................................... 200 feet (61 m)
Clearway......................................................................................... 500 feet (152 m)
Anti-Skid .............................................................................................OPERATIVE
Cowl and Wing Anti-Icing................................................................................. ON
Solution:
A. As seen in Step B of the Net Takeoff Flight example, the distance from the brake
release point to the reference zero point was determined as 5600 feet, and the
reference zero was determined as 56 feet above the brake release point. The
obstacle distance from reference zero is 119,400 feet (125,000 - 5600), and the
obstacle height above reference zero is 1944 feet (2000 - 56).
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
PERFORMANCE
FAA APPROVED 5.6-15
30 May 2002
B. As seen in Step F of the Net Takeoff Flight example, a 5.0% available 400 foot
net gradient was computed. From the DISTANT OBSTACLE CLEARANCE
REQUIRED NET TAKEOFF FLIGHT PATH, FLAPS 20° chart, the horizontal
distance from the reference zero point is determined as 32,000 feet to reach the
point of 1500-FT AGL for the available net gradient of 5.0%. Hence, the
remaining distance to the obstacle from the point of first reaching 1500-FT AGL
is 87,400 feet (119,400 - 32,000).
C. Following the dashed example lines shown on the DISTANCE REQUIRED TO
ACCELERATE FROM V2 TO VSE AT 1500-FT ABOVE GROUND LEVEL
WITH FLAP RETRACTION FROM 20° TAKEOFF FLAPS, the acceleration
distance required is determined as 14,000 feet. Hence, a distance of 73,400 feet
(87,400 – 14,000) is computed as the remaining distance from the start of the
enroute climb to clear the obstacle.
D. The incremental height of the obstacle is computed as 444 feet (1944 - 1500)
above 1500-FT AGL. The average climb gradient required to clear the obstacle at
the end of the 1500-FT accel can then be calculated as a gross gradient equal to
0.6% (100 x 444/73,400).
E. From the ENROUTE CLIMB GRADIENT chart, the available net climb gradient
is computed as 3.9% for a pressure altitude of 8,000 feet (airport elevation of
6,000 feet plus the obstacle height of 2,000 feet), -9° C (assuming normal lapse
rate from -5° C airport temperature), at other takeoff conditions as stated above.
F. A comparison of the results of Steps D and E shows that the available net enroute
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湾4飞机飞行手册AFM Gulfstream IV AIRPLANE FLIGHT MANUAL 2(95)
