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PERFORMANCE
FAA APPROVED 5.6-11
31 May 2000 GIV-SP
FINAL TAKEOFF CLIMB
Charts are presented for choosing final takeoff climb speed (VFS) and for determining final
takeoff climb gradient. Steady gross gradient of climb may not be less than 1.2%.
Conditions:
(1) Landing gear retracted
(2) Flaps 0°
(3) One engine inoperative
(4) Operating engine at Maximum Continuous Thrust
EXAMPLE: Find final climb speed and resulting gradient
Given: Airport Ambient Temperature............................................................................-5°C
Airport Pressure Altitude ..............................................................................6000 ft.
Takeoff Gross Weight .................................................... 63,000 pounds (28,580 kg)
Cowl and Wing Anti-icing .................................................................................. ON
Solution:
A. Enter FINAL TAKEOFF CLIMB SPEED chart with Airport Pressure Altitude =
6000 ft. Proceed right to 63,000 pounds (28,580 kg), then read down to Climb
Speed = 162.5 KCAS.
B. Enter FINAL TAKEOFF CLIMB GRADIENT chart with -5°C. Proceed right to
6000 ft., up to 63,000 pounds (28,580 kg), then read left to 1500 Foot Gross
Gradient = 5.0%.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.6-12 FAA APPROVED
GIV-SP 31 May 2000
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
FAA APPROVED 5.6-13
31 May 2000 GIV-SP
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.6-14 FAA APPROVED
GIV-SP 30 May 2002
DISTANCE TO ACCELERATE FROM V2 TO VSE AT 1500 FEET AGL
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
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湾4飞机飞行手册AFM Gulfstream IV AIRPLANE FLIGHT MANUAL 2(6)
