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avoid uneven braking.
CAUTION ZONE: Fuseplug release is possible; BKE is between 57 - 85 MFP.
1. Move airplane from runway. Use reverse thrust during continued taxi if airplane is ASC
166 equipped. One or more tires could deflate.
2. Use brakes sparingly to maneuver.
3. Do not set parking brake; chock nose wheel if required, do not approach main gear.
4. Allow brakes to cool per the BKE Cooling chart cooling times.
5. After cooling, make visual check. If fuseplugs have released, inspect per the equipment
component maintenance manuals.
DANGER ZONE: Fuseplug release is probable; BKE is greater than 85 MFP.
1. Clear runway immediately as fuseplugs will blow 2 to 30 minutes after last major braking
activity.
2. Evacuate airplane.
3. Do not apply "ansul" dry chemical or quench until fuseplugs have released the tire pressure.
4. Do not set parking brake; chock nose wheel if required.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
BRAKE KINETIC ENERGY &
CARBON BRAKE COOLING
APPENDIX C
FAA APPROVED C-5
31 May 2000 GIV-SP
5. Do not approach airplane for thirty (30) minutes or until all fuseplugs have blown.
6. When artificial cooling is not used, allow adequate cooling time per the BKE Cooling chart
for safe removal of the wheel / brakes.
7. After cooling, an inspection is required. Remove wheels, brakes and tires, and inspect per
equipment component maintenance manuals.
These BKE fuseplug integrity zones are guidelines and assume properly functioning brakes and
relatively even brake energies. It should be noted that dragging brakes or uneven brake pressure
may cause one wheel assembly to overheat and release a fuseplug while the total airplane BKE is
still in the "NORMAL ZONE". Also, fuseplugs on wheels containing "worn" brakes will release
at lower energy levels than "new" brakes.
USE OF BKE COOLING CHART
The basic method for estimation of the braking system capabilities consists of calculating the
remaining brake capacity using known history of prior operation and projected capability. The
following example solutions will illustrate this method.
EXAMPLE: Calculate landing, taxi, and RTO BKE, as well as cooling time requirements for
quick turn around operations.
Given:
Landing Gross Weight = 66,000 lbs Rwy Wind Component = 0 knots
Landing Taxi Distance = 1 mile Runway / Taxiway Slope = 0%
Landing Flaps = 39° Takeoff Gross Weight = 74,600 lbs.
Airport Pressure Altitude = 2,000 ft Takeoff Taxi Distance = 1 mile
Airport Temperature = 30°C Takeoff Flaps = 20°
Avg. Taxi Speed = 20 knots Brakes, not reverse thrust, used during
taxi operations.
Noted landing brake on speed = 106 KIAS
Noted peak BTMS temperature after
landing and taxi-in = 350°C
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
BRAKE KINETIC ENERGY &
CARBON BRAKE COOLING
APPENDIX C
C-6 FAA APPROVED
GIV-SP 31 May 2000
BKE CALCULATION WITHOUT BTMS
First determine the landing BKE. Enter the top left of the chart at the landing gross weight and
move horizontally to the intersection of the noted brake on speed of 106 knots. Drop vertically
to the reference line of the pressure altitude. Drop vertically to the reference line of the ambient
temperature portion of the chart. Move parallel to the correction curves to the intersection of the
field ambient temperature. Drop vertically to the taxi distance correction chart reference line and
then move parallel to the correction curves to the required taxi distances. Drop vertically to the
bottom of this section of the chart and read the landing BKE of 40.5 MFP.
Next determine the decision speed for the takeoff GW from AFM figure 5.5-3. (A lower V1
could have been employed; however, this V1 was selected to simplify illustration of this
example.) In this case use V1 = VR = 146 KCAS. Again enter the chart at the takeoff gross
weight of 74,600 pounds, move to the intersection of the 146 knots speed curve and then drop
vertically as before through the correction section of the chart to determine the rejected takeoff
kinetic energy of 83 million ft-lbs.
Adding these two energies will give the total required for this quick turn around operation of
123.5 MFP. This is 23.5 MFP greater than the maximum BKE capacity of 100 MFP. To
determine the cooling time from the end of the braking activity, enter the BKE scale at 23.5 MFP
and read 0.7 hours directly below on the ground cooling time scale.
BKE CALCULATION USING BTMS
To determine the cooling time before takeoff when the airplane is equipped with BTMS (Brake
Temperature Monitoring System), calculate the expected abort energy as before and then drop
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湾4飞机飞行手册AFM Gulfstream IV AIRPLANE FLIGHT MANUAL 2(53)
