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GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.5-12 FAA APPROVED
GIV-SP 31 May 2000
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
FAA APPROVED 5.5-13
31 May 2000 GIV-SP
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.5-14 FAA APPROVED
GIV-SP 31 May 2000
THIS PAGE INTENTIONALLY LEFT BLANK.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
FAA APPROVED 5.6-1
30 May 2002 GIV-SP
SECTION 5.6 OBSTACLE CLEARANCE LIMITED PERFORMANCE
NET TAKEOFF FLIGHT PATH
Takeoff gross weight is limited when the net takeoff flight path does not clear existing obstacles.
The obstacle clearance procedure is to climb with landing gear retracted, flaps in takeoff position
and at a speed of V2 to 1500 ft. Use of these charts will ensure that obstacles will be cleared by
minimum of 35 feet.
In addition to criteria governing accelerate-go distance, the following apply:
1. No configuration change, except gear retraction, is assumed to be made prior to
reaching height of 1500 ft. above takeoff surface.
2. Gear retraction shall be initiated immediately after lift-off.
3. The airplane shall attain speed V2 prior to reaching height of 35 feet above takeoff
surface and continue at speed as close as practical to, but not less than V2, until
reaching 1500 ft.
4. Net takeoff flight path data shall be determined in such manner that they represent
airplane’s actual takeoff flight paths diminished by gradient of climb equal to 0.8%.
5. At all points along takeoff path below 400 feet above takeoff surface, available gross
gradient of climb shall not be less than 2.4% with zero wind (FAR minimum
requirement).
6. At all points along takeoff path starting at 400 feet above the takeoff surface, the
available gross gradient of climb shall not be less than 1.2% with zero wind. (FAR
requirement for final takeoff climb).
Based on above requirements, obstacle clearance charts presenting required net takeoff flight
paths have been constructed. A chart which presents available second segment net climb
gradient for takeoff flight path is also shown. The available gradient chart is based on
assumption of one engine failure at critical engine failure speed (VEF) and inoperative thereafter.
All charts are conservatively based on no weight reduction due to fuel consumption during the
takeoff run and climb. Hence, weight to be used in charts should be that assumed at brake
release. Similarly, airport altitudes and temperatures are quoted throughout.
The charts provided may be used in the following manner:
A. Determine the required net gradient to clear obstacle: Enter the Required Net Takeoff
Flight Path charts with Height and Horizontal Distance equal to computed values of
obstacle height and distance relative to reference zero.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 5
SPECIAL
PERFORMANCE
5.6-2 FAA APPROVED
GIV-SP 30 May 2002
B. Determine the available net gradient for an assumed takeoff weight: This is shown as
the 400 foot net gradient in Available Second Segment Climb Gradient chart. If this
available gradient is greater than the required gradient from (A), then takeoff at the
assumed takeoff weight can be made. If this requirement is not satisfied, the takeoff
gross weight must be reduced. (If this requirement is not met with flaps 20°, takeoff
with flaps 10° should be considered since this provides better climb capability.)
←
←
Available Net
Gradient
Required Net Takeoff Flight Path
Reference Zero
Horizontal Distance
Obstacle Height
↓
Conditions:
(1) Takeoff flap setting
(2) One engine inoperative
(3) Operating engine at Takeoff Thrust
(4) V2 climb speed
EXAMPLE: Find maximum allowable takeoff gross weight:
Given: Airport Ambient Temperature...........................................................................-5° C
Airport Pressure Altitude ..............................................................................6000 ft.
Flaps .....................................................................................................................20°
Obstacle: 32,500 ft. (9906 m) from brake release point
1330 ft. (405 m) above brake release point
Takeoff gross weight...................................................... 63,000 pounds (28,580 kg)
Runway Slope .......................................................................................+1% (uphill)
Headwind .....................................................................................................10 knots
　
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