(4)
Check that fuel quantity indicators on center instrument panel (P-2) indicate at least 1675 pounds of fuel in each tank No. 1 and 2 for hydraulic fluid cooling plus amount needed for engine start-up and taxi operations.
CAUTION: A MINIMUM OF 1675 POUNDS (760 KILOGRAMS) OF FUEL IN TANK NO. 1 AND TANK NO. 2 IS REQUIRED TO PROVIDE HYDRAULIC FLUID COOLING. HYDRAULIC SYSTEM WILL OVERHEAT IF HEAT EXCHANGER IS NOT SUBMERGED.
(5)
Check flap position and make sure that flap handle and flaps are in corresponding positions before applying hydraulic power.
(6)
Ensure that hydraulic systems are pressurized for braking and nose wheel steering operation. One cockpit crew member should monitor brake pressure at all times during taxing.
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(a) Hydraulic power for main gear outboard brakes is supplied by system B. Power for main gear inboard brakes is supplied by system A. Nose wheel steering system is powered by hydraulic system A. Landing gear control lever must be in down position to activate nose wheel steering. Backup power for brakes and steering comes from standby system reservoir in system B. If all hydraulic systems are inoperative, airplane should not be taxied. However, if all hydraulic systems are lost during taxi operations, brakes may be operated from parking brake accumulator.
NOTE: Accumulator, when fully charged, allows approximately 3 brake applications.
(7)
Turn on VHF radio and select proper frequency for communications with airport ground control authority.
(8)
Turn on service interphone and/or hand radios for ground crew communications.
4. Taxi Airplane
A. Contact airport ground control and obtain necessary clearance for engine start.
B. Instruct ground crew to remove chocks and static ground wire (as required).
C. Turn on rotating beacon light. Beacon must remain on as long as engines are operating.
D. Turn on navigation lights. Lights must remain on as long as airplane is moving.
E. Start and operate engines (Ref Chapter 71).
F. When ready to taxi, contact airport ground control and obtain clearance to taxi.
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G. On signal from ground crew, release brakes and start to taxi.
(1)
Apply power smoothly and evenly to obtain airplane movement. Return engines to idle when airplane begins to move.
(2)
Start roll straight ahead before beginning any turn.
(3)
Use nose wheel steering wheel or rudder pedals to turn airplane. Maximum rotation of nose wheel steering wheel will provide approximately 65 degrees of nose wheel steering. Maximum rudder pedal movement will produce approximately 7 degrees of nose wheel steering.
(4)
Monitor ground crew during turning to remain clear of all obstructions. If taxi lines are available, taxi with nose wheel on the line.
(5)
Taxi slowly, with engines at idle. Use the Inertial Navigation System (INS) (if installed) in ground speed (GS) mode to monitor taxi speed. If airplane taxi speed is too fast at idle, slow down by gradual and even application of brakes for a short duration, then release. As airplane gains speed, reapply brakes. This cyclic application of brakes permits brake cooling while brakes are off. Do not try to maintain constant taxi speed by riding brakes.
CAUTION: DO NOT RIDE BRAKES TO MAINTAIN TAXI SPEED. EXCESSIVE USE OF BRAKES WITHOUT SUFFICIENT TIME TO COOL CAN CAUSE BRAKES TO OVERHEAT. THIS COULD RESULT IN BRAKE DAMAGE OR RELEASE OF TIRE INFLATION PRESSURE DUE TO MELTING OF WHEEL THERMAL FUSE PLUGS.
(6)
Make turns at as large a radius as possible to reduce tire scrubbing and landing gear side loads. Keep airplane rolling in turns; do not stop in a turn.
(7)
On completion of a turn, taxi in a straight line for a minimum of 12 feet to relieve tire and gear turning stresses.
H. Apply brakes as necessary to stop.
I. Set parking brake.
J. Use airline checklist to deactivate and shut down airplane systems.
K. Instruct ground crew to install wheel chocks and static ground wire (as required).
L. Release parking brake after chocks have been properly set (optional).
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5C9 JT8D Turbofan Engine Hazard Areas
Jun 20/86 Figure 201 (Sheet 4) 9-20-0
Page 206A
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