(f)
You must supply pressure to the applicable hydraulic systems to supply pressure for these operations: 1) To brake the airplane 2) For nose wheel steering 3) For body gear steering
(g)
When you taxi the airplane at night or in bad weather conditions, the crew must know the area around the airplane. They must know the location of parked vehicles, maintenance stands, and the condition of the taxi surface.
(h)
A taxi checklist for the airline maintenance persons is necessary to help the crew have a safe taxi operation.
(2)
Maintenance Persons Necessary to Taxi the Airplane
(a)
The persons necessary to taxi the airplane must include a flight compartment crew and a ground crew.
(b)
A minimum of two flight compartment persons are necessary.
1) Flight compartment persons must be approved on all the procedures that follow, for the taxi operations: a) To prepare the flight compartment b) The engine start, operation, and shutdown procedures c) The engine fire and emergency procedures d) The radio and intercom operation and procedures e) The taxi procedures (turning, wing tip clearances, taxi
speeds, etc.)
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747-400 MAINTENANCE MANUAL
(c) One or two ground crew persons are necessary to do the tasks that follow:
NOTE: In areas of congestion or a limit of space (hangars,
____ ramp areas next to the terminal, airplane parking areas, etc.) more ground persons are necessary. This is to help monitor the wing clearances and to be general observers.
1) To remove and replace the wheel chocks 2) To help during the engine start 3) To help the flight compartment crew during airplane
movement
4) To make sure the taxi path is clear
(3)
Communications
(a)
Most of the area around the airplane is out of the field of view permitted by the flight compartment windows. Also, much of the ground operations work near the airplane is out of the field of view of the flight compartment crew.
(b)
There must be communication between the airplane and ground crews. This is necessary during the engine start, removal and replacement of the wheel chocks, and the engine shutdown.
(c)
You must use hand signals, lights, intercom and/or radio communications to have a safe taxi operation.
(d)
The communications with the ground control authority is also necessary for taxi operations. This will make sure that persons in the tower know of the taxi operation, and the path the airplane will follow.
(4)
Procedures to Taxi the Airplane
(a)
Airplanes that exceed the maximum nose landing gear towing angle or maximum towing load should be inspected per AMM 05-51-29/201.
(b)
If you do not use the body gear steering, the airplane will not taxi like an airplane with a tricycle landing gear.
NOTE: This is caused by the geometric configuration of
____
the four main landing gear.
CAUTION: YOU SHOULD USE THE BODY GEAR STEERING SYSTEM WHEN YOU
_______ TAXI THE AIRPLANE. IF YOU DO NOT USE BODY GEAR STEERING, YOU CAN CAUSE DAMAGE TO THE TIRES.
1) With the body gear steering system not armed, you can cause the tires to scrub or slip.
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(c)
(d)
(e)
(f)
(g)
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747-400 MAINTENANCE MANUAL
When you use the body gear steering system, the movement of the
airplane on the ground is done with a procedure the same as
that used for other tricycle geared airplanes.
1) To arm the body gear steering system, you must close specified circuit breakers.
NOTE: This is very important during the operation at a
____ high gross weight where high stress is supplied to the tires.
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