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 30-21-00
 ALL  ú ú 01 Page 511 ú Sep 20/95

A

757
MAINTENANCE MANUAL

 ENGINE INLET THERMAL ANTI-ICE HIGH AND LOW PRESSURE SWITCHES -
______________________________________________________________ REMOVAL/INSTALLATION
____________________
 1. General
_______
 A. This procedure contains five tasks:
 (1)
The first task is the removal of the high pressure switch.

 (2)  
The second task is the removal of the low pressure switch.

 (3)  
The third task is the installation of the low pressure switch.

 (4)  
The fourth task is the installation of the high pressure switch.

 (5)  
The fifth task is a test of the low and high pressure switch installations.

 TASK 30-21-01-004-002
 2. Remove the High Pressure Switch (Fig. 401)
_______________________________
 A. References
 (1)  
AMM 70-50-02/201, Connection of Electrical Plugs

 (2)  
AMM 71-11-04/201, Fan Cowl Panels

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 B. Access
 (1)  
Location Zones
 413 No. 1 Power plant
 423 No. 2 Power plant

 (2)  
Access Panels
 413AL Fan cowl panel (Left)
 423AL Fan cowl panel (Right)

 C. Procedure - Remove the High Pressure Switch
 S 864-003
 (1)  Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
 (a)  
11C27 or 11C26, ENG ANTI-ICE LEFT

 (b)  
11C28 or 11C27, ENG ANTI-ICE RIGHT

 S 044-004
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT
_______ THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURY OR DAMAGE.
 (2)  
Do the Thrust Reverser Deactivation for Ground Maintenance procedure (AMM 78-31-00/201).

 S 014-005

 (3)  
Open the left fan cowl panel. Obey the precautions for the Kevlar wrapping (AMM 71-11-04/201).

 (4)  
Disconnect the electrical connector (AMM 70-50-02/201).

 S 034-006
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