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 (c)  The manual override assembly is turned through 180 degrees and installed on the valve body. Make sure the tongue of the jackscrew engages with the groove in the valve head. During this operation, it is possible to see the valve head through the housing of the override assembly. The webs on the valve head prevent the incorrect location of the tongue.
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757 MAINTENANCE MANUAL
 (d)  The gaskets and locking plate are then put on top of the assembly. The necessary valve position, as engraved on the plate, will show above the jackscrew (the position will be on the forward edge of the plate).
 CAUTION: WHEN YOU MANUALLY POSITION THE VALVE, MAKE SURE THE TONGUE
_______ OF THE JACKSCREW ENGAGES WITH THE SLOT IN THE VALVE HEAD AND THE SLOT IN THE LOCKING PLATE. WHEN YOU INSTALL THE LOCKING PLATE, IT MUST BE FULLY DOWN ON THE VALVE ASSEMBLY AND NOT REQUIRE "PULLING DOWN" WITH THE RETAINING BOLTS. FAILURE TO COMPLY CAN RESULT IN DAMAGE TO THE VALVE.
 (e)  
To position the valve head, turn the jackscrew with a wrench. Do this until the lug on the jackscrew engages in the slot on the bottom of the locking plate.

 (f)  
RB211-535E4 SERIES ENGINES WITH THE TAI VALVE POSITION SWITCH; The valve position indicator assembly is then installed. Make sure the lever of the indicator assembly points up.

 (g)  
Install the six bolts and tighten them to attach the assembly (Ref 70-51-00/201).

 B.  Engine Inlet Thermal Anti-Ice (TAI) Pressure Switches
 (1)  
Two pressure switches (high and low) are located on the left side of each engine. The high pressure switch is above the TAI valve and the low pressure switch is below the TAI valve.

 (2)  
The low pressure switch is used to indicate valve position. The high pressure switch senses a failure in the pressure regulating function of the TAI valve.

 C.  RB211-535E4 SERIES ENGINES WITH THE TAI VALVE POSITION SWITCH; Engine Inlet Thermal Anti-Ice (TAI) Valve Position Switch
 (1)  
A valve position switch is installed at the top of the engine TAI valve and below the manual override assembly (the jackscrew and tongue). During the normal valve operation, the valve position switch is electrically in series with the low pressure switch.

 (2)  
The movement of the engine TAI valve mechanically operates the valve position switch, which opens or closes when the valve does. The valve position switch prevents an unwanted display of the VALVE disagree light on the M10397 (P5) panel.
　
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本文鏈接地址：757 AMM 飛機維護手冊 防冰和排雨 CHAPTER 30 - ICE AND RAIN PROTECTION(47)