(2)  
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 (3)  
AMM 32-00-15/201, Landing Gear Door Locks.

 (4)  
AMM 32-00-20/201, Landing Gear Downlocks

 B.
Access

 (1)  
Location Zones
 115 NLG Wheel Well (Left)
 116 NLG Wheel Well (Right)

 C.
Procedure

 S 434-011
 (1)  
Install a new O-ring in the port of the tee.

 S 024-012

 (2)  
Install the hydraulic pressure switch in the tee.

 S 034-013

 (3)  
Install the lockwire between the hydraulic pressure switch and the tee.

 (4)  
Connect the electrical connector to the hydraulic pressure switch.

 S 714-015

 (5)  
Do the steps that follow to make sure the switch operates correctly:

 (a)  
Supply electrical power (Ref 24-22-00).

 S 034-014
 

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757
MAINTENANCE MANUAL

 (b)  
Make sure this circuit breaker on the P6 panel is closed: 1) 6F5, LANDING GEAR ALTN EXT CONT

 (c)  
Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).

 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.

 (d)  
Open the doors for the main landing gear and install the doorlocks (AMM 32-00-15/201).

 (e)  
Push the ALT EXT switch on the first officer's panel, P3.

 CAUTION: IF THE ALTERNATE EXTENSION SYSTEM MOTOR DOES NOT SHUTOFF
_______ AFTER 30 SECONDS, OPEN THE LANDING GEAR ALTN EXT CONT (6F5) CIRCUIT BREAKER ON THE P6 PANEL. THIS WILL PREVENT DAMAGE TO THE POWER PACK.
 (f)  
Make sure the alternate extension system motor operates, then stops in 30 seconds. The motor is on the keel beam of the right MLG wheel well.

 (g)  
Make sure there are no hydraulic leaks at the hydraulic pressure switch.

 S 094-003
 (6)  
Remove the door locks from the landing gear doors and close the doors (AMM 32-00-15/201).

 S 864-002

 (7)  
Remove the pressure from the hydraulic system if it is not necessary (AMM 29-11-00/201).

 (8)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-001
 

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757 MAINTENANCE MANUAL
 WHEELS AND BRAKES - DESCRIPTION AND OPERATION
_____________________________________________
 1.  General_______
 A.  This section on wheels and brakes includes maintenance coverage on the following related topics:
 (1)  
Hydraulic brake system (AMM 32-41-00/001).

 (2)  
Antiskid/autobrake system (AMM 32-42-00/001).

 (3)  
Parking brake system (AMM 32-44-00/001).

 (4)  
Tires and wheels (AMM 32-45-00/001).

 (5)  
Brake temperature monitoring system (AMM 32-46-00/001).

 2.  Component Details_________________
 A.  Hydraulic Brake System
______________________
 (1)  
The hydraulic brake system is used to provide a means to slowdown and/or stop the airplane after landing touchdown and during taxi operations. Brakes installed in each of the main landing gear wheels are actuated hydraulically by manual brake pedal movement or automatically through the autobrake system (AMM 32-42-00) (see hydraulic brake system description and operation).

 B.  
Antiskid/Autobrake System

_________________________
 (1)  
The antiskid system automatically releases the brakes to prevent skids or loss of control during braking (see antiskid system description and operation).

 (2)  
The autobrake system automatically applies the brakes after landing, to slow the airplane at a deceleration rate selected by the pilots before landing (see autobrake system description and operation).

 C.  
Parking Brake System

____________________
 (1)  
The parking brake system enables the airplane brakes to be set for 8 hours minimum for parking (see parking brake system description and operation).
　
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