A320飞机维护手册 AMM SERVICING 2(60)

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R  (b) Read tables 1 and 2 (draining of the water/waste system) to find 
R  if it is necessary to drain or not (depending on the ambient 
R  temperature and the cold soak period). 
R 
R  (c) After draining of the system and parking of the aircraft at 
R  temperatures below 0 deg.C (32.00 deg.F): 
R  - Let the drain valves and the service panels stay open to let 
R  remaining fluid to flow out. 
R  - Do not install the caps on the drain and the fill/drain 
R  nipples. 
R  NOTE : If you install the caps, the remaining fluid can freeze____ 
R  immediately behind the drain and the fill/drain caps and 
R  will cause: 
R  - Damage to the piping system 
R  - The system to become unserviceable 
R  - Delay at the next servicing.

 

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| TABLE 1 | |-----------------------------------------------------------------------------| | CONFIGURATION | | WATER | -------------------------------------------------|COLD SOAK TIME| AND | | AIR | CABIN | OUTSIDE AIR | (HOURS:MIN) | WASTE | | CONDITIONING | TEMPERATURE | TEMPERATURE | | TANKS DRAIN | |--------------|-------------|-------------------|--------------|-------------| | | | BETWEEN | | NOT | | | | 0 AND -15 deg.C | ANY | REQUIRED | | | ABOVE | (32 AND 5 deg.F) | | | | ON | 10 deg.C |-------------------|--------------|-------------| | | (50 deg.F) | BELOW | | | | | | -15 deg.C | 1:15 | | | | | (5 deg.F) | | | |--------------|-------------|-------------------|--------------| | | | | BETWEEN | | | | | | 0 AND -7 deg.C | 1:30 | | | | |(32 AND 19.4 deg.F)| | | | | |-------------------|--------------| | | OFF | | BETWEEN | | REQUIRED | | | | -7 AND -15 deg.C | 0:30 | | | | | (19.4 AND 5 deg.F)| | | | | |-------------------|--------------| | | | | BELOW | | | | | | -15 deg.C | ANY | | | | | (5 deg.F) | | | -------------------------------------------------------------------------------
(2) Potable water system
 CAUTION : MAKE SURE THAT THE TEMPERATURE OF THE AIR SUPPLIED BY THE
_______ AIRCRAFT BLEEDAIR SYSTEM IS NOT HIGHER THAN 50 DEG.C (122 DEG.F). IF THE AIR IS HOTTER THAN 50 DEG.C (122 DEG.F). IT CAN CAUSE DAMAGE TO THE AIRCRAFT.
 (a) In case of aircraft parking under very low temperature conditions you must drain and purge the potable water system. Pressurize and ventilate the system to remove residual water. Do the procedure given below:
 -drain the potable water system
 -close all the lavatory and galley manual shutoff valves
 -pressurize the potable water system after closing all potable
 water drain and fill valves
 - open one manual shutoff valve

 1EFF : ALL 1 12-31-38Page 204 1 1 May 01/04R 1 1 1CES 1

 - make sure that air but no water comes out of the faucet
R R R R  connected to the open manual shutoff valve - close the faucet outlet with flat of hand, flush the toilet as often as necessary until you are sure that air but no water comes out of the toilet rinse valve (this part of procedure is applicable for vacuum toilets only) Do the whole procedure above for all lavatories and galleys with potable water supplied equipment as there are water heater, coffee maker and water faucets - open all drain valves of the potable water system - operate the water faucets in the galleys several times to bleed them 
R R  NOTE : you must repeat the procedure as often as necessary to____ make sure that the residual water has drained fully. 
R R R  The duration of the residual water drainage after the end of the water flow from the potable water system can take at least 15 minutes. This depends on the attitude of the aircraft. If the aircraft has been moved, the drain valves should be open again to make sure that all the residual water is drained. - depressurize the potable water system
R  (b) If you cannot drain the potable water system, you must heat the aircraft with an external or internal source as follows :

 

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| TABLE 2 | |--------------------------------------------------------------------------| | OUTSIDE AIR |EXTERNAL HEAT | APU | SUPERVISOR | DRAINING OF | | TEMPERATURE | SOURCE | | | WATER SYSTEM | |--------------|--------------|--------------|--------------|--------------| | 0 deg.C | 1 HOUR | | | | | (32 deg.F) | | | | | | to | EVERY | NO | NO | NO | | -5 deg.C | | | | | | (23 deg.F) | 4 HOURS | | | | |--------------|--------------|--------------|--------------|--------------| | -5 deg.C | 2 HOURS | | | | | (23 deg.F) | | | | | | to | EVERY | NO | NO | NO | | -10 deg.C | | | | | | (14 deg.F) | 4 HOURS | | | | |--------------|--------------|--------------|--------------|--------------| | -10 deg.C | | | | | | (14 deg.F) | | | | | | to | CONTINUOUS | NO | NO | NO | | -15 deg.C | | | | | | (5 deg.F) | | | | | |--------------|--------------|--------------|--------------|--------------| | BELOW | | AS | | | | -15 deg.C | CONTINUOUS | REQUIRED | YES | YES | | (5 deg.F) | | | | | ----------------------------------------------------------------------------
　
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