38-41-00
ALL ú ú 04 Page 1 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
APU AIR
MANIFOLD AIR PRESSURE SUPPLY LINE TO WATER TANK
AIR FLOW
RESTRICTOR
TO PACK INSTALLATION-AIR CYCLE SYSTEM (REF)
PRESSURE REGULATOR
SEE AAIR
FILTER
CHECK
VALVE
AIR PRESSURE SUPPLY LINE
PRESSURE RELIEF VALVE WATER TANK
MOUNTING
AIR
BOLT
AIR LINE FROM PNEUMATIC DUCT LINE IN
AIR LINE
FROM SERVICE
PANEL
OUTLET SIDE OF FILTER
PRESSURE
REGULATOR
AIR FILTER
PRESSURE AIR LINE
RELIEF VALVE TO TANK
CHECK
VALVE
FWD
A
VALVE CHECK
PANEL (REF) WATER SERVICE POTABLE WATER SUPPLY LINE (REF)
Water Tank Pressurization System
Figure 1
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38-41-00
ALL ú ú 01 Page 2 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
REFER TO CHAPTER 36, PNEUMATICS
ENGINE NO.1 BLEED AIR
1 ENGINE NO.2
Water Tank Pressurization System Schematic
Figure 2
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38-41-00
ALL ú ú 01 Page 3 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
6. Check Valve
___________
A. Check valves prevent reverse flow of water into the different components (Fig. 2).
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38-41-00
ALL ú ú 02 Page 4 ú Mar 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
WATER TANK PRESSURIZATION SYSTEM - MAINTENANCE PRACTICES
________________________________________________________
1. General_______
A. This procedure has these tasks:
(1)
Depressurization of the water tank.
(2)
Pressurization of the water tank.
B. The water tank is pressurized with air from the pneumatic system. The pneumatic system air is available from an engine or the APU.
C. A different procedure to pressurize the water tank is to connect a nitrogen source to the air valve on the water service panel.
D. You must remove the pressure from the water tank before you can do maintenance on a part of the potable water system.
TASK 38-41-00-862-001
2. Water Tank Depressurization___________________________
A. References
(1)
AMM 12-31-31/201, Body Section 46 Access Door and Panels
(2)
AMM 49-11-00/201, APU Power Plant
B. Access
(1) Access Panel
3303 A/C Access Panel
C. Depressurize the Water Tank
S 862-002
(1) If the No. 1 engine is on, close the No. 1 bleed air shutoff valve.
(a) Put the BLEED 1 toggle switch to OFF on the P5-10 module of the forward overhead panel.
S 862-003
(2)
If the No. 2 engine is on, close the bleed air isolation valve.
(a) Put the ISOLATION VALVE toggle switch to CLOSE on the P5-10 module of the overhead panel.
(3)
Stop the APU if it is on (AMM 49-11-00/201).
S 862-006
(4)
Momentarily turn the left and right valve switches for the air conditioning pack on the forward overhead panel to ON, then turn them to OFF.
S 862-007
(5)
Disconnect the nitrogen source from the air valve at the water service panel if the nitrogen source is connected.
S 862-004
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