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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
SPECIAL
PERFORMANCE
FAA APPROVED 5.6-15
30 May 2002 GIV-SP
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
climb gradient of 3.9% exceeds the required average enroute climb gradient of
0.6%. Hence, the enroute obstacle clearance requirement is conservatively
satisfied (note that the net enroute climb gradient available is the gross gradient
reduced by 1.1% in accordance with FAR 25).
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.6-16 FAA APPROVED
GIV-SP 30 May 2002
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
FAA APPROVED 5.6-17
30 May 2002 GIV-SP
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.6-18 FAA APPROVED
GIV-SP 30 May 2002
THIS PAGE INTENTIONALLY LEFT BLANK.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
FAA APPROVED 5.7-1
30 May 2002 GIV-SP
SECTION 5.7 ENROUTE CLIMB
Charts are presented for choosing the enroute climb speed (VSE) and for determining the enroute
climb gradient. The enroute climb speed shown is the speed for best gradient. The gradient data
shown have been reduced by a gradient of 1.1% as specified by FAR 25. The gradient of climb
read from chart should be used directly.
Conditions:
(1) Landing gear retracted
(2) Flaps 0°
(3) One engine inoperative
(4) Operating engine at Maximum Continuous Thrust
EXAMPLE: Find the enroute climb speed and the resulting gradient
Given: Ambient Temperature .......................................................................................-9° C
Pressure Altitude ...........................................................................................8000 ft.
Gross Weight.................................................................. 63,000 pounds (28,580 kg)
Headwind ....................................................................................................10 knots
Cowl and Wing Anti-icing .................................................................................. ON
Solution:
A. Enter the ENROUTE CLIMB SPEED chart with Pressure Altitude = 8000 ft.
Proceed right to 63,000 pounds (28,580 kg), then read down to Climb Speed =
170.8 KCAS.
B. Enter the ENROUTE CLIMB GRADIENT chart with temperature -9° C. Proceed
right to 8000 ft., up to 63,000 pounds (28,580 kg), then read left to Net Gradient =
3.9%.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.7-2 FAA APPROVED
GIV-SP 30 May 2002
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
FAA APPROVED 5.7-3
30 May 2002 GIV-SP
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.7-4 FAA APPROVED
　
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