NOTE: You can bend the arm as much as 0.06 inch
____
 (1.5 mm). Do not make a sharp bend on (or bend and straighten) the actuator arm.
 3) Install the switch with the two screws on the mounting
 bracket. 4) Partly tighten the two screws to hold the switch in place. 5) Adjust the switch by moving it on the mounting screws as
 was done previously. 6) AIRPLANES PRE-SB 27A2356; Make sure the switch engages between 2 and 8 degrees. 7) AIRPLANES POST-SB 27A2356; Make sure the switch engages between 10 and 14 degrees. 8) If the switch still does not engage correctly, replace the switch.
 S 424-013-N00
 (7)  
Tighten the mounting screws for the control switch to hold it in the correct position.

 S 084-014-N00

 (8)  
Remove the bubble protractor and the protractor adapter from the reverse thrust lever.

 S 424-017-N00

 (9)  
Install the applicable Thrust Lever Assembly Switch Covers.

 (a)  
Put the switch cover for the thrust lever assembly on the thrust lever assembly.

 (b)  
Install the three screws in the swich cover.

 (c)  
Tighten the three screws.

 S 714-016-N00
 (10)
 To test the control switch, do the Thrust Reverser
 Operation - Power Procedure (AMM 78-31-00/201).

 E.
Put the Airplane Back to Its Usual Condition.

 S 444-017-N00
 (1)  Supply electrical power to the Thrust Lever Switches
 (AMM 76-11-03/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 444-019-N00
 (2)  Do the activation procedure for the speed brake control system (AMM 27-62-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
THRUST REVERSER ISOLATION VALVE PRESSURE SWITCH -
_________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  The thrust reverser isolation valve pressure switch is referred to as the pressure switch in this procedure.
 B.  This procedure has two tasks. The first task gives instructions to remove the pressure switch. The second task gives instructions to install the pressure switch.
 TASK 78-34-07-004-001-N00
 2.  Remove the Thrust Reverser Isolation Valve Pressure Switch__________________________________________________________
 A.  References
 (1)  
AMM 27-62-00/201, Speed Brake Control System

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

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

 (4)  
AMM 78-34-05/401, Thrust Reverser Isolation Valve

 (5)  
IPC 78-34-05, Figs. 5

 (6)  
IPC 78-34-05, Figs. 6

 B.  
Access

 (1)  
Location Zones
 450 Engine 1 Strut
 460 Engine 2 Strut
 470 Engine 3 Strut
 480 Engine 4 Strut

 (2)  
Access Panels 451BL Thrust Reverser Isolation Valve Access Door - Strut 1 462EL Aft Upper Midspar Pressure Relief Access Door - Strut 2 472EL Aft Upper Midspar Pressure Relief Access Door - Strut 3 481BL Thrust Reverser Isolation Valve Access Door - Strut 4

 C.  
Prepare to Remove the Pressure Switch for the Isolation Valve.

 S 044-009-N00
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE AUTOMATIC SPEED BRAKES.
_______ IF YOU DO NOT DO THIS, THE AUTOMATIC SPEED BRAKES CAN MOVE QUICKLY WHEN YOU MOVE THE THRUST LEVERS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Do this task: Automatic Speed Brake System Deactivation (AMM 27-62-00/201).
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