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 1.  General_______
 A.  This procedure gives you the instructions to do a test of the OVERHEAT warning lights and the overheat switches (in the case drain lines) for the A an B electric motor-driven pumps (EMDPs).
 NOTE: The temperature switch (235- -8-F) connected to the motor housing
____ of the EMDP is not a line maintenance item. You must use the EMDP manufacturer's overhaul manual to do a test of it. This procedure does a test of the wires for the switch.
 TASK 29-32-01-735-001
 2.  Overheat Warning System Test____________________________
 A.  General
 (1)  If hydraulic fluid gets on the airplane, clean it off (AMM 12-40-00/201).
 B.  Special Tools and Equipment
 (1)  H294 - Tempcal Multirange Thermocouple and Thermal Switch Tester -with BH 16440-40 probe (BH 16440-40 probe is a part of 65-91500-2 or -4 probe kit) (altenate).
 H394 - Temp-Cal Tester with adapter cable BH405 (alternate).
 BH24944 Heater Probe Kit (basic P/N)
 NOTE: This kit is necessary to use the H394 tester listed
____ above. There are different dash number kits for specific airplane model and tester combinations. Please consult with supplier.
 Howell Instruments
 3479 West Vickery Blvd.
 Fort Worth, Texas 76107

 C.  Standard Tools and Equipment
 (1)  Container for BMS 3-11 hydraulic fluid.
 D.  References
 (1)  
AMM 12-40-00/201, Cleaning and Washing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-09-00/201, Hydraulic Reservoir Pressurization System

 (4)  
AMM 29-32-12/401, Hydraulic Fluid Overheat Warning Switch

 E.  Access
 (1)  Location Zones
 101/102 Control Cabin
 216/217 Main Wheel Wells

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A 737-300/400/500MAINTENANCE MANUAL
 F. Prepare for the Test
 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Make sure these circuit breakers are closed:

 (a)  P6-3 Panel
 1) INDICATOR MASTER DIM BUS BAT
 2) INDICATOR MASTER DIM BUS NO. 1 DC
 3) INDICATOR MASTER DIM BUS NO. 2 DC
 4) INDICATOR MASTER DIM BUS SECT 1
 5) INDICATOR MASTER DIM BUS SECT 2
 6) INDICATOR MASTER DIM BUS SECT 3
 7) INDICATOR MASTER DIM BUS SECT 4

 S 865-004
 (3)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P6-3 Panel 1) INDICATOR MASTER DIM BUS SECT 5 (for system B) 2) INDICATOR MASTER DIM BUS SECT 6 (for system A)

 (b)  
P6-2 Panel
 1) ELEC HYD PUMP CONTROL (for system B)
 2) ELEC HYD PUMP CONTROL (for system A)

 

 S 865-005
 (4)  Release the pressure from the hydraulic reservoirs
 (AMM 29-09-00/201).

 G. Wire Test for the EMDP Temperature Switch
 S 035-006
 (1) Remove the electrical connectors of the EMDPs (system A and B).
 (a)  
Connector D2666 (for system B)

 (b)  
Connector D2664 (for system A)

 S 485-007
 (2)  
Connect pin 7 of connectors D2666 and D2664 to ground.

 S 865-008

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6-3 Panel
 1) INDICATOR MASTER DIM BUS SECT 5 2) INDICATOR MASTER DIM BUS SECT 6
 S 215-009
 (4)  Make sure the OVERHEAT lights (ELEC 1 and ELEC 2) on the P5 panel come on.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-010
 (5)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6-3 Panel
　
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