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E,G,H aircraft rolls. will center themselves as Above |35 degrees body trucks to |35 degree nose gear angle. 1 required. No special towing procedure Body trucks steer as desired up 
Yes  No  A to H All Paths  required. No special towing procedure locked. Body trucks remain centered and 
No  Yes or No 
Steered  Yes  Yes A,D  required. No special towing procedure Body trucks steer as desired. 
B,F  required. No special towing procedure themselves as aircraft rolls. Body trucks will center and lock 
C  Use exit path D. large turning radius. causing "crabwise" motion or Body trucks positioned for opposite hand turn at start 
____Above 35 degrees body trucks center themselves because torsional force

 

1
NOTE:
of tire scrubbing overcomes steering cylinder hydraulic pressure.
Recommended Towing Procedures
Figure 210 (Sheet 1)

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A
747-400
MAINTENANCE MANUAL

PARKED POSITION OF BODY TRUCKS  NO. 1 HYDRAULIC SYSTEM PRESSURIZED  POWER ELECTRICAL AVAILABLE  EXIT PATH (Fig. 208)  COMMENTS AND TOWING PROCEDURE 
Steered  Yes  Yes  E,H  Body trucks steer as desired up will center themselves as to |35 degree nose gear angle. Above |35 degrees body trucks No special towing procedure required. aircraft rolls. 1 
G  opposite hand turn at start Body trucks positioned for causing "crabwise" motion or large turning radius. Use exit path H. 
No  A,B,C,D,E, F,H  "crabwise" motion will occur when attempting path C. After locking, trucks will stay centered and locked for re-mainder of tow. No special towing procedure required. lock as aircraft rolls. Some Body trucks will center and 
G  Body trucks positioned for opposite hand turn at start causing "crabwise" motion or large turning radius. Use exit path H. 
No  Yes or No  A,G,H  Body trucks will steer to maxi-mum angle permitted by actuator stroke and excessive tire scrubbing will occur. 
NOTE:Above 35 degrees body trucks center themselves because torsional force of tire scrubbing overcomes steering cylinder hydraulic pressure.

 

1
Recommended Towing Procedures
Figure 210 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PARKED POSITION OF BODY TRUCKS  NO. 1 HYDRAULIC SYSTEM PRESSURIZED  POWER ELECTRICAL AVAILABLE  EXIT PATH (Fig. 208)  COMMENTS AND TOWING PROCEDURE 
Steered  No  Yes or No  A,G,H  Body trucks must be centered and locked by towing aft with nose wheel steering angle set for the same direction turn as used for the entry maneuver. Greater nose wheel angles will shorten the required towing dis-tance aft. Trucks will be der of tow. Aircraft may now centered and locked for remain-be towed per paths A, G, or H. 
B,F  Body trucks will center and lock during path F if nose gear steering angle is set for the same direction turn as used for entry; and during path B if nose gear steering angle is set for the opposite direction turn as used for entry. Body trucks will be centered and locked for remainder of tow. No special towing procedure required. Body trucks will steer to max-imum angle permitted by actuator stroke and excessive tire scrubbing will occur during path B if nose gear steering angle is set for the same direction turn as for entry; and during path F if nose gear steering angle is set for the opposite direction turn as for entry. 

Recommended Towing Procedures
Figure 210 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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