30-21-01
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MAINTENANCE MANUAL

HIGH PRESSURE SWITCH
SEE B
LOW PRESSURE SWITCH SEE C SEEA
ANTI-ICE HIGH AND LOW 
PRESSURE SWITCHES 
RELIEF BOLT INTERNAL  BOLT  A 

WASHERS  FLEXIBLE
INTERCONNECTING HOSE
TUBE
MOUNTING BRACKET
ADAPTER PRESSURE
TUBE BOLT SWITCH BOLT
OUTER HALF INNER HALF INTER-CLAMP CLAMP CONNECTING
WASHER TUBE
WASHER NUT WASHERS HARNESS CLIP
WASHER BOLT ELECTRICAL CONNECTOR
NUT
C B
Engine Inlet Thermal Anti-Ice High and Low Pressure Switches Installation Figure 401
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757 MAINTENANCE MANUAL
 S 034-017
 (5)  
Remove the internal relief bolt and the flat washers from the sides of the interconnecting tube.

 S 034-069

 (6)  
Remove the two bolts, washers and the outer half clamp. Keep the pressure switch on the mounting bracket.

 S 034-068

 (7)  
Remove the three nuts, washers and bolts that hold the pressure switch to the mounting bracket.

 S 424-067

 (8)  
Move the pressure switch from the mounting bracket and remove them together with the inner half clamp.

 S 494-066

 (9)  
Put covers on the openings and connectors.

 TASK 30-21-01-004-018
 3.  Remove the Low 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 Low Pressure Switch
 S 864-076
 (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
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