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found at the intersection of the ambient temperature column and the takeoff weight row.
6. For a reduced-thrust takeoff, locate the adjusted field length in the takeoff weight row. This
column is the assumed temperature column. The EPR setting for the reduced-thrust takeoff
(FLEX EPR) is shown beneath the assumed temperature at the top of the column.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
FLEX EPR
PERFORMANCE
APPENDIX A
A-4 FAA APPROVED
30 May 2002
7. This Appendix does not include any obstacle clearance information. Check obstacle clearance
using the charts presented in the Airplane Flight Manual for the selected takeoff flap setting and
the assumed temperature. If obstacles are not cleared, decrease the assumed temperature by
columns until obstacle clearance has been obtained. New V-speeds and FLEX EPR must then be
determined.
CAUTION: THE OBSTACLE CLEARANCE CHARTS MUST BE ENTERED WITH THE
ASSUMED TEMPERATURE.
TAKEOFF PLANNING EXAMPLE
1. Departure Conditions:
a. Dry, Hard-Surfaced Runway
b. Available Field Length = 6200 feet
c. Airport Pressure Altitude = Sea Level
d. Ambient Temperature = +4°C
e. Wind Component = 5 knot headwind
f. Runway Slope = 1.0% uphill
g. Takeoff Runway Obstacles = None
2. Airplane Configuration:
a. Takeoff Gross Weight = 62,000 Pounds
b. Flaps = 20°
c. Ground Spoilers = INOPERATIVE
d. Cowl Anti-Icing = As required (ambient temp.
is below +10°C)
e. Wing Anti-Icing = OFF
3. Determine:
a. Adjusted Runway Length (from appropriate table). See TAKEOFF PLANNING EXAMPLE
chart, Figure A-1.
- Headwind Correction (6200 x +2%) = +124 feet
- Uphill Slope Correction (6200 feet x -20%) = -1240 feet
- Inoperative Ground Spoilers Correction: = -800 feet
- Adjusted Runway Length (6200 + 124 - 1240 - 800): = 4284 feet
b. Takeoff Thrust and V-speeds:
- Full-thrust and Flex-thrust Takeoff
VFS = 157 KCAS
VSE = 164 KCAS
VREF = 144 KCAS
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
FLEX EPR
PERFORMANCE
APPENDIX A
FAA APPROVED A-5
30 May 2002
- Full-thrust Takeoff
MIN EPR = 1.69
V1 = 122 KCAS
VR = 130 KCAS
V2 = 137 KCAS
- FLEX-thrust Takeoff
FLEX EPR = 1.67
V1 = 123 KCAS
VR = 131 KCAS
V2 = 137 KCAS
c. Verify MAX TEMP and maximum EPR reduction are not exceeded:
- MAX TEMP = +50°C
Assumed Temperature = +35°C
NOTE: Brake energy, tire speed, and takeoff climb limitations are included in the
determination of MAX TEMP. None of these limits will be exceeded as long
as the assumed temperature does not exceed MAX TEMP.
- MIN EPR minus FLEX EPR equals EPR reduction
1.69 - 1.67 = .02
Maximum allowed EPR reduction of 0.15 is not exceeded.
d. Obstacle clearance verification:
- Verify obstacle clearance based on the selected flap setting and the assumed temperature
(+35°C for this example). Use the field length found in the table as the reference
accelerate-go distance. If the obstacles are not cleared, reduce the assumed temperature by
columns until obstacle clearance height is attained.
- Determine V-speeds and FLEX EPR associated with the final assumed temperature.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
FLEX EPR
PERFORMANCE
APPENDIX A
A-6 FAA APPROVED
30 May 2002
TAKEOFF PLANNING EXAMPLE
AIRPORT PRESSURE ALTITUDE = SEA LEVEL TAKEOFF FLAP 20°
73,200 LB MTOGW OAT (°C) 50 45 40 35 30 25 20 15 5 -5 -15
OAT (°F) 122 113 104 95 86 77 68 59 41 23 5
MIN EPR 1.59 1.62 1.64 1.67 1.70 1.70 1.70 1.70 1.69 1.69 1.69
-- 73,200 LB --
VFS = 171 KCAS FLD LNGTH ****** ****** ****** 5,900 5,550 5,460 5,370 5,280 5,160 4,990 4,820
VSE = 178 KCAS V1 KCAS ****** ****** ****** 139 137 137 137 137 138 138 138
VREF = 157 KCAS VR KCAS ****** ****** ****** 144 143 143 143 143 143 143 143
MAX TEMP = 39°C V2 KCAS ****** ****** ****** 148 148 148 148 148 148 148 148
-- 72,000 LB --
VFS = 170 KCAS FLD LNGTH ****** ****** 6,120 5,710 5,370 5,280 5,200 5,120 4,990 4,830 4,660
VSE = 177 KCAS V1 KCAS ****** ****** 138 137 136 136 136 136 136 136 136
VREF = 156 KCAS VR KCAS ****** ****** 143 143 142 142 142 142 142 142 142
MAX TEMP = 40°C V2 KCAS ****** ****** 147 147 147 147 147 147 147 147 147
-- 70,000 LB --
VFS = 167 KCAS FLD LNGTH ****** ****** 5,760 5,390 5,070 4,990 4,910 4,840 4,720 4,560 4,400
VSE = 174 KCAS V1 KCAS ****** ****** 136 134 133 133 133 133 134 134 134
VREF = 154 KCAS VR KCAS ****** ****** 141 140 140 140 140 140 140 140 140
MAX TEMP = 43°C V2 KCAS ****** ****** 145 145 145 145 145 145 145 145 145
　
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