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A
737-300/400/500MAINTENANCE MANUAL
 WATER AND TOILET DRAIN ANTI-ICING SYSTEM - ADJUSTMENT/TEST
__________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks.
 (1)  
The first task is a test of the Water and Toilet Drain Anti-Ice System.

 (a)  
The test energizes each component in the system. Then, you will feel the component to make sure it becomes hot.

 (b)  
The components in this task are the drain masts (airplanes with heated drain masts) and the toilet drain gaskets.

 (2)  
The second task is a test of the gasket heater at the toilet drain.

 TASK 30-71-00-705-001
 2.  Water and Toilet Drain Anti-Ice System Test
___________________________________________
 A.  References
 (1)  
AMM 24-21-00/001, AC Generation System

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

 (3)  
AMM 49-00-00/001, Airborne Auxiliary Power

 (4)  
IPC 30-70-00 Fig. 1

 (5)  
IPC 38-30-00 Fig. 12

 (6)  
SSM 30-71-00

 (7)  
WDM 30-71-01

 B.  Access
 (1)  
Location Zone
 101 Control Cabin - Left
 102 Control Cabin - Right
 200 Lower Half of the Fuselage

 (2)  
Access Panel
 1502R AFT Toilet Service Panel

 C.  AIRPLANES WITH HEATED DRAIN MASTS;
 Procedure

 S 865-034
 (1)  
Start the auxiliary power unit (AMM 49-00-00/001).

 S 865-004

 (2)  
Use the APU to supply AC electrical power to bus No. 1 (AMM 24-21-00/001).

 NOTE: The electrical power must be from the APU, not an external
____ source. Do not supply external electrical power for this part of the test.
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A 737-300/400/500MAINTENANCE MANUAL
 (3)  S 865-017Make sure this circuit breaker is closed: (a) On the P18-3 panel 1) DRAIN MAST AIR
 (4)  S 715-006Feel the drain masts to make sure they are cool.
 (5)  S 865-018Open this circuit breaker and attach a DO-NOT-CLOSE tag: (a) On the G7 panel 1) BUS PROTECTION PANEL
 (6)  S 715-008Do a test to make sure the drain mast heaters operate correctly in flight.
 CAUTION:_______ DO NOT PUSH THE AIR SENSING SWITCH FOR MORE THAN 5 SECONDS. YOU CAN CAUSE DAMAGE TO THE DRAIN MAST IF YOU KEEP IT ENERGIZED.
 (a)  Push the AIR SENSING switch on the E11 shelf for approximately 5 seconds.
 WARNING:_______ ONLY TOUCH THE DRAIN MAST LONG ENOUGH TO KNOW IT IS HOT. THE DRAIN MAST CAN BURN YOU IF YOU HOLD IT FOR A LONG TIME.
 (b)  Feel the drain mast to make sure it is hot.
 (7)  S 865-035Stop the auxiliary power unit (AMM 49-00-00/001).
 (8)  S 865-019Close this circuit breaker and remove the DO-NOT-CLOSE tag: (a) On the G7 panel 1) BUS PROTECTION PANEL
 (9)  S 845-010Let the drain mast become cool before you do the subsequent step.

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737-300/400/500MAINTENANCE MANUAL
 S 865-033
 (10) Supply external electrical power (AMM 24-22-00/201).
 NOTE: The electrical power for this part of the test must be from
____ an external source, not from the APU or the engines.
　
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