757 AMM 飞机维护手册 TOWING & TAXIING(11)

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____ conditions about differential braking.
 1)  Decrease the speed of the airplane with the brakes when it is necessary, before the turn is started.
 2)  Make a minimum radius turn with maximum nose wheel steering, and the engine thrust only.
 3)  When you use the brakes during a turn, the main and nose landing gear tires will be scrubbed.
 (g)  When it is possible, complete the taxi in a straight line roll for a minimum of 12 feet. This will remove the torsional stresses in the landing gear components, and in the tires.
 (6)  Airplane taxi in bad weather conditions.
 (a)  
You must know the conditions of the taxi surface, and the taxi speeds when you taxi in bad weather conditions.

 (b)  
If the taxi surface has snow, slush, or ice on it, the anti-ice system can be used.

 (c)  
Taxi the airplane with the flaps up.

 (d)  
Use the differential engine thrust when you taxi the airplane on a slick surface at decreased speeds. This will help to keep airplane movement through a turn.

 (e)  
A light differential braking can have more of an effect than nose wheel steering, on very slick surfaces.

 E.  Airplane Characteristics
 (1)  
757-200 AIRPLANES; The minimum turn radius that the airplane can make is shown in Figure 201. The wingtips and the horizontal stabilizer move in larger arcs during a turn than the nose of the airplane. Thus, monitor these areas of the airplane carefully for clearance with buildings, equipment, and other airplanes.

 (2)  
The basic factors that can change the geometry of a turn are as follows:

 (a)  
The nose wheel steering angle

 (b)  
The engine power position

 (c)  
The center of gravity location on the airplane

 (d)  
The airplane gross weight

 (e)  
The taxi surface conditions

 (f)  
The airplane ground speed

 (g)  
The differential braking that you use.

 

 (3)  
When you operate jet engine airplanes, you must follow all precautions. This is neccessary to prevent injury to persons, or damage to buildings, equipment, or other airplanes.

 (a)  Refer to Figure 202 and Figure 203 to find the dangerous areas at engine idle, and at the engine breakaway thrust.
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 09-21-00
 ALL  ú ú 01 Page 204 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
WARNING:
A

757
MAINTENANCE MANUAL

1
SEE A
175 FEET
EXHAUST HAZARD AREA
IF SURFACE WIND IS REPORTED GREATER THAN 25 KNOTS, INCREASE DISTANCE OF INLET BOUNDARY BY 20%. IF RAMP SURFACES ARE SLIPPERY, ADDITIONAL PRECAUTIONS SUCH AS CLEANING THE RAMP WILL BE NECESSARY TO PROVIDE PERSONNEL SAFETY.
GROUND PERSONNEL MUST STAND CLEAR OF THESE HAZARD ZONES AND MAINTAIN COMMUNICATION 5 FEET WITH FLIGHT COMPARTMENT PERSONNEL DURING ENGINE ENTRYRUNNING.
CORRIDOR
ENTRY CORRIDOR9 FOOT RADIUS 45`
INLET HAZARD AREA 1DOTTED LINE INDICATES HAZARD AREA
A
BOUNDARY FOR SINGLE ENGINE OPERATION
Minimum Idle/High Idle - Power Hazard AreaFigure 202
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 09-21-00
 ALL  ú ú 01 Page 205 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

SEE  A 
400 FEET 
EXHAUST HAZARD AREA 
_______WARNING:  IF SURFACE WIND IS REPORTED 
GREATER THAN 25 KNOTS, INCREASE 
DISTANCE OF INLET BOUNDARY BY 20%. 
IF RAMP SURFACES ARE SLIPPERY, 
ADDITIONAL PRECAUTIONS SUCH AS 
CLEANING THE RAMP WILL BE NECESSARY 
TO PROVIDE PERSONNEL SAFETY.  7 FEET 
GROUND PERSONNEL MUST STAND 
CLEAR OF THESE HAZARD ZONES 
AND MAINTAIN COMMUNICATION 
WITH FLIGHT COMPARTMENT 
PERSONNEL DURING ENGINE 
RUNNING. 

16 FOOT RADIUS
45`

INLET HAZARD AREA A
Breakaway Thrust - Power Hazard Area
　
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