747-400 AMM 飞机维护手册 TOWING AND TAXIING(23)

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 The body gear steering arms automatically when you close specific circuit breakers.
 2)  Use the nose wheel steering, the body gear steering, and the engine thrust as it is necessary to taxi the airplane.
Airplane ground stability.
 1)  During airplane taxi, the center of gravity (CG) must always be below the ground stability limits (Fig. 201).
 2)  Find the airplane CG for the applicable airplane configuration. Use the component weight and CG data, and the procedures to calculate them, in the approved Weight and Balance manuals.
Airplane clearance during the taxi operation.
 1) Make sure you have the necessary clearance when you go near a parked airplane or other structure. a) When the APU in the taxi airplane or the parked airplane is on, you must have a minimum clearance of
 32.8 feet (10 meters). The clearance must be between the APU exhaust port and the adjacent airplane's wingtip (fuel vent).
Airplane taxi speed.
 1)  The usual taxi speed should not be more than approximately 20 knots. Speeds more than this, added with long taxi distances, will increase the temperature of the tires.
 2)  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.
 1)  Always use the largest turn radius possible.
 2)  Do not try to turn the airplane until it has moved.
 3)  The wingtips and the horizontal stabilizer move in larger
 arcs during a turn than the nose of the airplane (Fig. 202). Thus, monitor these areas of the airplane carefully for clearance with structures, equipment, and other airplanes.
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900  11.0%  24.8% 20.0%  873,000  41% MAC 
8.5% 853,000  STATIC TIPPING LIMIT 
800  803,000  33%  BODY GEAR LOAD LIMIT 
778,000 MAX TAXI WEIGHT FOR TOWING WITH STEERING LINKS DISCONNECTED  ENVELOPE NORMAL  745,900 38.57% 723,000 780,000 
700  0% 
FORWARD CG TOWING LIMIT  659,000
600  564,000  13%  AFT CG TOWING TIPPING LIMIT WITH 82,000 TOW BAR LOAD 
500 

AIRPLANE GROSS WEIGHT (1000 LBS)

410,000 
-10  0  CENTER OF GRAVITY IN %MAC 10 20 30  40 
Taxi Center of Gravity Limitations Figure 201 

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NOTE: RADII B AND C ARE TO OUTSIDE EDGE OF OUTBOARD TIRES
Turning Clearance Figure 202 (Sheet 1)
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BODY GEAR STEERING INOPERATIVE WITH BODY GEAR STEERING MEASURED TO OUTSIDE EDGE OF OUTER TIRE(S)
Turning Clearance
Figure 202 (Sheet 2)

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 4) Make all turns at a slow taxi speed to prevent tire skids. 5) When you use an outboard engine to help make a turn, use
 the minimum power that is possible. 6) Do not let the airplane stop during a turn. 7) Prevent the use of the brakes to help make a turn.
　
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