COLD WEATHER MAINTENANCE - WATER/ WASTE - MAINTENANCE PRACTICES
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TASK 12-31-38-660-001
Cold Weather Maintenance - Water/Waste
WARNING : MAKE SURE THAT THE WATER TANK IS DEPRESSURIZED.
_______
CAUTION : MAKE SURE THAT THE DRAIN VALVES REMAIN OPEN AFTER YOU DRAIN THE
_______
POTABLE WATER SYSTEM IF :
-
THE BLEED AIR SYSTEM IS "OFF" AND
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THE OUTSIDE AIR TEMPERATURE IS BELOW 0 DEG.C (32 DEG.F). THIS WILL PREVENT DAMAGE TO THE POTABLE WATER SYSTEM.
CAUTION : BEFORE YOU SUPPLY AIR FROM AN EXTERNAL SOURCE OR THE APU, MAKE
_______ CERTAIN THAT : -AT LEAST ONE COCKPIT WINDOW OR CABIN DOOR IS OPEN AND THAT IT REMAINS OPEN DURING SERVICING. -IF THE AIRCRAFT IS PARKED OUTSIDE AND IS NOT PROTECTED FROM THE RAIN ONE MAINTENANCE DOOR OR AVIONICS COMPARTMENT ACCESS DOOR IS OPEN AND THAT IT REMAINS OPEN DURING SERVICING.
1. Reason for the Job
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To prevent damage to the water/waste system by ice when the aircraft is not supplied with power or other sources of hot air.
NOTE : Although an aircraft is resistant to very low ambient temperatures,
____ the cabin air conditioning (and WIPU system) keep the pipes (and water systems sufficiently warm to prevent them) from freezing. However, when the aircraft is not energized or stays on the ground at
R sub-zero temperatures, you must do additional procedures to prevent R damage to the systems by ice.
NOTE : If the service panels or caps are frozen closed, you must not use
____
force to open or release them. You must apply hot air.
2. Job Set-up Information______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-15-38-613-001 12-16-38-613-001 12-24-38-680-001 Fill the Potable Water Tank System (Aircraft Electrical Power Available)Servicing of the Toilet SystemDraining of the Potable Water System (with Electrical Power)
R 3. Job Set-up__________
R Subtask 12-31-38-941-050
R A. There is no special job set-up for this task.
4. Procedure_________
Subtask 12-31-38-660-050
A. Pre-Flight (First Flight of the Day)
R R (1) After draining due to low ambient temperatures you must obey the steps that follow.
R (2) Make sure that all drain valves are closed.
R (3) Potable Water System
R R R R (a) Fill the potable water system with warm water of 30 deg.C (86.00 deg.F) not earlier than 30 minutes before the engine start (Ref. TASK 12-15-38-613-001).
R R (b) Pressurize the potable water system and examine the fill/drain valve for leaks.
R R (c) Remove excessive quantity of water from around the service panel before you close it.
(4) Waste system
R
R (a) Pre-charge the waste tanks not earlier than 30 minutes before the
R engine start (Ref. TASK 12-16-38-613-001).
R - Remove excessive liquid from around the waste service panel
R before you close
R
R it.
Subtask 12-31-38-660-051
B. Post Flight (Last Flight of the Day but not Transit Stops) (Ref. TASK 12-
16-38-613-001) (Ref. TASK 12-24-38-680-001)
(1) General
R
R (a) You must do the servicing of the potable water and waste water
R tanks as soon as possible after a flight.
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