757
MAINTENANCE MANUAL

 S 582-006
 WARNING: WHEN ELECTRICAL POWER IS NOT AVAILABLE TO OPERATE THE BRAKE
_______ HYDRAULIC SYSTEM, TELL THE TOW VEHICLE PERSON. WITHOUT ELECTRICAL POWER, THERE IS ONLY ACCUMULATOR PRESSURE AVAILABLE TO OPERATE THE BRAKES. YOU MUST DECREASE THE TOW SPEEDS OR NOT TOW THE AIRPLANE.
 (1)  Tow the Airplane (Ref 09-11-00).
 S 582-003
 CAUTION: ELECTRICAL POWER FROM THE 28V DC HOT BATTERY BUS IS NECESSARY
_______ TO SET THE PARKING BRAKES ELECTRICALLY (NORMAL). WHEN ELECTRICAL POWER IS NOT AVAILABLE, THE MANUAL OVERRIDE LEVER ON THE PARKING BRAKE VALVE MUST BE MOVED MANUALLY TO POSITION 2 (YOU CAN FIND THE VALVE IN THE RIGHT MAIN GEAR WHEEL WELL). FAILURE TO CLOSE THE PARKING BRAKE VALVE BEFORE YOU APPLY THE BRAKES WILL CAUSE THE HYDRAULIC PRESSURE TO DECREASE.
 (2) When the airplane tow is completed, set the parking brake.
 S 492-004
 ú WARNING:  USE THE PROCEDURE IN AMM 32-00-15 TO INSTALL THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Open the doors for the landing gear and install the door locks (Ref 32-00-15).

 S 982-005

 (4)  
Do the steps that follow to apply the parking brake:

 (a)  
Put the manual override lever of the parking brake valve, (found in the right main gear wheel well), to POS 2 (closed).

 (b)  
Push the top of the rudder pedals to apply the brakes.

 (c)  
Pull the parking brake lever to keep pressure on the brake linkage.

 (d)  
Release the brake pedal pressure.

 (e)  
Release the parking brake handle.

 NOTE: Release the foot pressure on the brake pedal before
____ the parking brake handle is released. When you do not release the foot pressure, the parking brakes will not be applied.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 09-11-03
 ALL  ú ú 01.1 Page 202 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 TOW AIRPLANE WITH FLAT TIRE(S) - MAINTENANCE PRACTICES
______________________________________________________
 1.  General
_______
 A.  The airplane can be towed when it has flat tires (see Figure 201). Such operations must be kept to a minimum because overloads occur frequently, during these conditions, on the inflated tires. These overloads cause the good tires to be damaged and replacement will be necessary. Also during some conditions, damage can occur to the wheels, landing gear, and/or the airplane structure.
 TASK 09-11-04-582-001
 2.  Tow Airplane With Flat Tire(s)
______________________________
 A.  References
 (1)  
09-11-00/201, Towing

 (2)  
32-45-03/601, Wheels

 B.  Prepare to Tow the Airplane with Flat Tires
 S 582-002
 (1)  To tow the airplane with flat tires, do the steps that follow (Ref 09-11-00):
 (a)  
The airplane can be towed by the nose gear with one flat nose tire and five flat main tires. This is permitted only to remove the airplane from the runway. If there is a total of more than six flat tires, tow the airplane at both main gear.

 (b)  
Keep the tow speeds to a minimum.

 (c)  
Avoid sharp turns when the airplane is towed.

 S 212-003
 (2)  After the airplane is towed with two flat tires on one axle (as in conditions (2), (6), (7), (8), of Figure 201), do a wheel inspection. The inspection must include an NDT inspection for cracks and concentricity (Ref 32-45-03).
 NOTE: It is not recommended to tow the airplane if the wheel rims
____ are ground flat. Wheel rims with flat spots could cause high drag loads and landing gear damage.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 09-11-04
 ALL  ú ú 01 Page 201 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
GIVES LOCATION OF INFLATED TIRE
GIVES LOCATION OF FLAT TIRE
　
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