3. Job Set-up
__________
Subtask 12-24-38-680-052
A. Draining of the Potable water System
CAUTION : MAKE SURE THAT THE DRAIN VALVES REMAIN OPEN AFTER YOU DRAIN THE
_______
POTABLE WATER SYSTEM IF :
-
THE BLEED AIR SYSTEM IS "OFF" AND
-
THE OUTSIDE AIR TEMPERATURE IS BELOW 0 DEG.C (32 DEG.F). THIS WILL PREVENT DAMAGE TO THE POTABLE WATER SYSTEM.
(1) You must drain the water system when the outside air temperature is as shown in the table.
CAUTION : MAKE SURE THAT THE DRAIN VALVES ARE IN THE CLOSED POSITION
_______ IF THE BLEED AIR SYSTEM IS "ON". YOU MUST DO THIS LESS THAN 10 MIN AFTER THE FLOW OF WATER FROM THE DRAIN PORTS OF THE POTABLE WATER SYSTEM STOPS. THIS WILL PREVENT DAMAGE TO THE POTABLE WATER SYSTEM.
1EFF : ALL 1 12-24-38Page 214 1 1 May 01/04R 1 1 1CES 1
Table 1 - Water System Drain Configuration
-------------------------------------------------------------------------------| Configuration | Ex | Water Tank| Purge | |----------------------------------------------|posure | Drain | of | | Air | Cabin | Outside |Time in| Required | System | |Conditioning| Temperature | Air |(Hours:| | Required | | | | Temperature | Min) | | | |------------|-------------|-------------------|-------|-----------|----------| | | Above | Between | | | | | | | 0 and -15 DEG.C | Any | NO | | | ON | 10 DEG. C | 32 and 5 DEG.F | | | | | | 50 DEG. F |-------------------|-------|-----------| | | | | Below | | | NO | | | |-15 DEG.C 5 DEG.F | 1:15 | | | |------------|-------------|-------------------|-------| | | | | | Between | | | | | | | 0 and -7 DEG.C | 1:30 | | | | | | 32 and 19.4 DEG.F | | | | | | |-------------------|-------| YES |----------| | OFF | | Between | | | | | | |-7 and -15 DEG.C | 0:30 | | | | | | 19.4 and 5 DEG.F | | | YES | | | |-------------------|-------| | | | | | Below | | | | | | |-15 DEG.C 5 DEG.F | Any | | | |-----------------------------------------------------------------------------| | You must refill the tank with water not more than 30 minutes before you | | start the engines. If the temperature in the aircraft is below 4 DEG.C | | (39.2 DEG.F), pre-condition the aircraft (Ref. 12-33-21 Page 2). | ------------------------------------------------------------------------------
NOTE : To purge the potable water system when the outside air
____ temperature is -7 DEG.C and lower, refer to the Cold Weather Maintenance (Ref 12-31-38 Page 2).
R **ON A/C 001-049, 051-099, 101-149, 201-299,
Subtask 12-24-38-941-053
B. Put the access platform in position at Zones 171, 138, 133.
R **ON A/C 151-199, 301-399, 401-499,
Subtask 12-24-38-941-053-A
B. Put the access platform in position at Zones 171, 133.
**ON A/C ALL
Subtask 12-24-38-860-051
C. Aircraft Maintenance Configuration
(1)
Make sure that the potable water shutoff-valve in each lavatory is open.
(2)
Make sure that the potable water-mixing timer control-knob in each lavatory is set to the center position (between the RED and BLUE band).
(3)
Make sure that the potable water shutoff-valve in each galley is open.
**ON A/C 001-049, 051-099, 101-149, 201-299,
Subtask 12-24-38-010-055
D. Open for Access
(1)
Open the access panels 133AL, 192NB, 171AL.
(2)
Remove the cap from the fill and drain port on the service panel 2023VU.
R **ON A/C 151-199, 301-399, 401-499,
Subtask 12-24-38-010-055-A
D. Open for Access
(1)
Open the access panels 133AL, 171AL.
(2)
Remove the cap from the fill and drain port on the service panel 2023VU.
**ON A/C ALL
4. Procedure
_________ R **ON A/C 001-049, 051-099, 101-149, 201-299,
Subtask 12-24-38-680-053
A. Drain the Potable Water System
(Ref. Fig. 201/TASK 12-24-38-991-004-A)
CAUTION : MAKE SURE THAT THE DRAIN VALVES ARE IN THE CLOSED POSITION IF
_______ THE BLEED AIR SYSTEM IS "ON". YOU MUST DO THIS LESS THAN 10 MIN AFTER THE FLOW OF WATER FROM THE DRAIN PORTS OF THE POTABLE WATER SYSTEM STOPS. THIS WILL PREVENT DAMAGE TO THE POTABLE WATER SYSTEM.
(1)
Connect the drain hoses to:
-
the fill and drain port on the service panel,
-
the drain port on the MID drain and overflow panel,
-
the drain port on the FWD drain panel.
