78-34-07
 ALL  ú ú N01 Page 401 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 864-010-N00
 (2)  
Make sure the forward thrust levers are in the idle position and
 attach the DO-NOT-OPERATE tags.

 S 864-011-N00

 (3)  
Make sure the reverse thrust levers are in the fully stowed position and attach the DO-NOT-OPERATE tags.

 S 044-012-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______
 OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF
 THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO
 EQUIPMENT.

 (4)  Do this procedure: Thrust Reverser Deactivation for Ground
 Maintenance (AMM 78-31-00/201).

 S 864-024-N00
 CAUTION: BE PREPARED TO CATCH HYDRAULIC FLUID IN A SUITABLE CONTAINER.
_______
 IMMEDIATELY CLEAN ALL OF THE HYDRAULIC FLUID THAT FALLS. THE
 HYDRAULIC FLUID CAN CAUSE CONTAMINATION OF THE AIRPLANE OR THE
 ENGINE.

 (5)  
Depressurize the applicable main hydraulic system and resevoir
 (AMM 29-11-00/201).

 D.
Remove the Pressure Switch for the Isolation Valve (Fig. 401).

 S 014-013-N00
 (1)  Remove the isolation valve for the thrust reverser
 (AMM 78-34-05/401).

 NOTE: Because of the tight isolation valve installation, it is
____ recommended that you remove the isolation valve to replace the pressure switch.
 S 034-014-N00
 (2)  
Remove the lockwire from the pressure switch.

 (3)  
Remove the pressure switch from the isolation valve.

 S 024-015-N00
 NOTE: There is the shape of a hexhead near the bottom of the
____ pressure switch casing. Use a wrench on this hexhead to remove the pressure switch.
 (a) Remove the packing from the bottom of the pressure switch.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 78-34-07
 ALL  ú ú N01 Page 402 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FORWARD STRUT FAIRING
SEE A
PRESSURE SWITCH
PACKING
LOCKWIRE
BYPASS VALVE MANUAL OVERRIDE LEVER (REF)
ISOLATION VALVE
FWD
A
Thrust Reverser Isolation Valve Pressure Switch Installation Figure 401
C78896
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 78-34-07
 ALL  ú ú N02 Page 403 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TASK 78-34-07-404-005-N00
 3. Install 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 and 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.
Install the Pressure Switch for the Isolation Valve (Fig. 401).

 S 434-016-N00
 (1)  
Install the packing on the end of the pressure switch with the threads.

 S 424-017-N00

 (2)  
Install the pressure switch on the isolation valve.
　
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