(2)  
There must be a minimum of two flight compartment persons (One taxi approved person and one observer) .

 (a)  One flight compartment person must be approved on all of the procedures that follow, for the taxi operations:
 NOTE: It is not necessary for the observer to be taxi
____
 approved.

 1) To prepare the flight compartment 2) The engine start, operation, and shutdown procedures 3) The engine fire and emergency procedures 4) The radio and intercom operation and procedures 5) The taxi procedures (turning, wing tip clearances, taxi
 speeds, etc.)
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 (3)  One or two ground crew persons are necessary to do the tasks that follow:
 NOTE: In areas of congestion or a limit of space (hangers, 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.
 (a)  
To remove and replace the wheel chocks

 (b)  
To help during the engine start

 (c)  
To help the flight compartment crew during the airplane movement

 (d)  
To make sure the airplane taxi path is clear.

 C. Communications
 (1)  
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.

 (2)  
There must be communication between airplane and ground crews. This is necessary during the engine start, removal and replacement of wheel chocks, and during the engine shutdown.

 (3)  
You must use hand signals, lights, intercom and/or radio communications. These are important to have a safe taxi operation.

 (4)  
The communications with the ground control authority is also necessary for taxi operations. This will make sure that the persons in the tower know of the taxi operation, and the path that the airplane will follow.

 D. Procedure to Taxi the Airplane
 (1)  
When you taxi the airplane on the ground, the movement is equivalent to other conventional tricycle geared airplanes.

 (a)  The nose wheel steering, and the engine thrust are used as necessary, to taxi the airplane.

 (2)  
Airplane ground stability.

 (a)  During the airplane taxi, the center of gravity (CG) must always be below the Ground Stability Limits line (Figure 201).
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 (3)
(4)

(5)

(6)

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737-300/400/500MAINTENANCE MANUAL
 (b)  
Find the airplane center of gravity (CG) for the applicable airplane configuration. Use component weight and CG data, and the procedures to calculate them, in the approved weight and balance manuals.

Airplane clearance during the taxi.

 (a)  
Make sure you have the necessary clearance when you go near a parked airplane or other structures. When the APU in the taxi airplane or the parked airplane is on, you must have a minimum clearance of 50 feet. The clearance must be between the APU exhaust port and the adjacent airplane's wingtip (fuel vent).

Airplane taxi speed.

 (a)  
The taxi speed must not be more than approximately 20 knots. Speeds more than this, added to long taxi distances will cause heat to collect in the tires.

 (b)  
Before you make a turn, decrease the speed of the airplane to a speed which is applicable to the local conditions. On a dry surface, use a speed of approximately 8 to 12 knots.

Airplane turns during taxi.

 (a)  
Always use the largest turn radius possible.

 (b)  
Do not try to turn the airplane until it has moved.

 (c)  
　
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