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ELECTRONIC SPEED SWITCH - REMOVAL/INSTALLATION
______________________________________________
 1.  General
_______
 A.  This procedure contains the removal and the installation tasks for the electronic speed switch.
 B.  The electronic speed switch is installed in a mounting tray above a ceiling panel in the passenger compartment. The mounting tray is above the No. 2 lowered ceiling panel in the aft end of the passenger compartment.
 TASK 49-61-22-004-001
 2.  Electronic Speed Switch Removal (Fig. 401)
_______________________________
 A.  References
 (1)  AMM 25-21-71/401, Lowered Ceiling Panels
 B.  Access
 (1)  
Location Zones
 101 Flight Compartment, LH
 108 Aft Half of Passenger Cabin
 205 Electronic Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door

 

 C.  Procedure
 S 864-002
 (1)  Set the switch and the circuit breaker:
 (a)  
Set the APU master switch, on the P5 forward overhead panel, to the OFF position and attach a DO-NOT-OPERATE tag.

 (b)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit

 S 014-004
 (2)  
Open the No. 2 lowered ceiling panel in the aft end of the passenger cabin (AMM 25-21-71/401).

 S 024-003

 (3)  
Remove the electronic speed switch:

 (a)  
Disconnect the electrical connector from the electronic speed switch.

 (b)  
Remove the screws and the washers that attach the electronic speed switch to the mounting tray.

 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////

Electronic Speed Switch Installation
Figure 401 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F41730
FWD
(4 LOCATIONS)

 

Electronic Speed Switch Installation
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F42050
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(c)  
Remove the nut and washers that attach the bonding jumper to the electronic speed switch.

 (d)  
Remove the electronic speed switch from the mounting tray.

 (e)  
Install the washers and nut to the electronic speed switch.

 TASK 49-61-22-404-005
 3. Electronic Speed Switch Installation (Fig. 401)
____________________________________
 A. References
 (1)  
AMM 20-10-37/401, Electrical Bonding

 (2)  
SWPM 20-20-00, Standard Wiring Practices Manual

 (3)  
AMM 25-21-71/401, Lowered Ceiling Panels

 (4)  
AMM 49-11-00/201, APU Power Plant

 B. Access
 (1)  
Location Zones
 101 Flight Compartment, LH
 108 Aft Half of Passenger Cabin
 205 Electronic Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door

 

 C. Procedure
 S 424-012
 (1)  Install the electronic speed switch:
 (a)  
Remove the nut and washers that attach the bonding jumper to the electronic speed switch.
　
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