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 NOTE: Hydraulic system No. 4 supplies pressure to the
____ normal brake system and the hydraulic brake accumulator. With only the No. 4 system energized, there will be no hydraulic pressure available to steer the body gear. Also, 1800 psi will supply sufficient pressure for brakes while towing with only the No. 4 electric pump to supply the system pressure.
 (b)  If you use the APU: 1) Supply pressure to the main hydraulic system No. 4.
 NOTE: Hydraulic system No. 4 supplies pressure to
____ the normal brake system and the hydraulic brake accumulator.
 2)  If hydraulic power is necessary to steer the body gear, pressurize the hydraulic system No. 1.
 NOTE: Hydraulic system No. 1 will provide hydraulic power
____ to steer the body gears when the towing angle exceeds 20 degrees. This is when the airplane is in the ground mode, and the wheel speed is less than 20 knots.
 S 862-095
 WARNING: IF YOU LOSE ELECTRICAL POWER OR IF THE HYDRAULIC SYSTEM 4 IS
_______ INTERRUPTED, DECREASE THE TOW SPEED IMMEDIATELY OR STOP THE TOWING PROCEDURE. A DECREASE IN ELECTRICAL POWER OR HYDRAULIC PRESSURE CAN DECREASE OR PREVENT THE OPERATION OF THE BRAKES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (17) While towing with the APU off, electrical power from the tow vehicle to the airplane can be lost. Hydraulic pump operation will stop. If this happens, do the steps that follow to stop the airplane and prevent the loss of brake hydraulic pressure.
 (a)  
Advise the tow vehicle operator to stop.

 (b)  
When the tow is stopped, apply airplane brakes and keep them applied.

 (c)  
Turn the battery switch on.

 (d)  
Set the parking brake.

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 09-11-00
 ALL  ú ú 06 Page 212 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (e)  Open the 6L18 PARK BRAKE circuit breaker on the P6 Main Power
 Distribution Panel to make sure the valve remains closed.
 (f)  Turn the battery switch off.
 (g)  Release the parking brake and make sure that HYD BRAKE PRESS
 gage shows approximately 3000 psi.
 NOTE:____ Full hydraulic pressure (3000 psi.) supplies only one
 full application of the brakes.

 S 862-090
 WARNING: IF YOU LOSE ELECTRICAL POWER OR IF THE HYDRAULIC SYSTEM 4 IS
_______ INTERRUPTED, DECREASE THE TOW SPEED IMMEDIATELY OR STOP THE TOWING PROCEDURE. A DECREASE IN ELECTRICAL POWER OR HYDRAULIC PRESSURE CAN DECREASE OR PREVENT THE OPERATION OF THE BRAKES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (18) While towing, the towing shear pin can fail.  This will disconnect the tow vehicle from the airplane. If the APU is off, this condition will cause hydraulic pump operation to stop. If this happens, do the steps that follow to stop the airplane and prevent the loss of brake hydraulic pressure.
 (a)  
Immediately apply airplane brakes and keep them applied.

 (b)  
Turn the battery switch on.

 (c)  
Set the parking brake.

 (d)  
Open the 6L18 PARK BRAKE circuit breaker on the P6 Main Power Distribution Panel to make sure the valve remains closed.

 (e)  
Turn the battery switch off.

 (f)  
Release the parking brake and make sure that HYD BRAKE PRESS gage shows approximately 3000 psi.

 NOTE: Full hydraulic pressure (3000 psi.) supplies only one
____ full application of the brakes.
 S 862-015
 CAUTION: IF YOU EXCEED THE PERMITTED NOSE GEAR LOADS IN A TURN, YOU CAN
_______ CAUSE STRUCTURAL DAMAGE.
 (19) Make sure you do not exceed the maximum permitted tow load.  See Fig. 203 for the maximum nose and main gear tow loads.
 NOTE: A tow bar shear pin values can be larger than the permitted
____ nose gear loads in turns more than 20 degrees.
 (a)  If you tow the airplane at an angle and weight more than is specified, do the Exceeding Maximum Nose Gear Towing Angle or Maximum Towing Load Conditional Inspection (AMM 05-51-29/201).
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