D.
Do a visual inspection of the PITOT and STATIC probes. Subtask 12-31-12-865-052
E. If the VENT AVNCS SYS FAULT message is shown on the upper ECAM DU, reset these AEVC C/Bs:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06 49VU AIR COND/AVNCS VENT/CTL 5HQ D05 122VU AIR COND/AVNCS/VENT/MONG 3HQ Y17
5. Close-up
________ Subtask 12-31-12-942-054
A. Remove the equipment
(1)
Remove the mobile equipment.
(2)
Remove the access platform(s).
(3)
Remove the ground support and maintenance equipment, the special and
standard tools and all other items.
COLD WEATHER MAINTENANCE - AIR CONDITIONING - MAINTENANCE PRACTICES
___________________________________________________________________ TASK 12-31-21-660-001 Cold Weather Maintenance - Air Conditioning
1. Reason for the Job
__________________
This procedure gives the cold weather maintenance practices for the air conditioning.
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-31-31-660-001 Cold Weather Maintenance - Indicating/Recording
systems and Navigation 12-31-38-660-001 Cold Weather Maintenance - Water/Waste 12-31-49-660-001 Cold Weather Maintenance - Auxiliary Power Unit 12-33-21-618-001 Pre-conditioning through the LP Ground Connection 12-33-21-618-001 Pre-conditioning through the HP Ground Connection 12-33-21-618-001 Pre-conditioning with the APU
3. Job Set-up
__________ Subtask 12-31-21-660-050
A. General
(1) To know if pre-conditioning is necessary, refer to tables 1 and 2 in the cold weather practices for the water/waste system (Ref. TASK 12-31-38-660-001).
1EFF : ALL 1 12-31-21Page 201 1 1 May 01/99R 1 1 1CES 1
R (2) Avionics Bay Temperature
R CAUTION : DO NOT ENERGIZE THE AIRCRAFT ELECTRICAL NETWORK IF:_______
R - THE TEMPERATURE IN THE AVIONICS COMPARTMENT IS EQUAL TO
R OR LESS THAN -40.C (-40.00.F), AND
R - THE CIRCUIT BREAKERS FOR THE COMPUTERS IN THE AVIONICS
R COMPARTMENT ARE CLOSED.
R BEFORE YOU ENERGIZE THE ELECTRICAL CIRCUITS IN THESE
R TEMPERATURES, YOU MUST OPEN THE CIRCUIT BREAKERS. IF THE
R CIRCUIT BREAKERS STAY CLOSED, PERMANENT DAMAGE CAN OCCUR TO
R THE COMPUTERS.
R NOTE : The temperature factor for operation of those computers____
R located in the aircraft avionics bay is the avionics bay
temperature.
R
R You must measure the temperature in the avionics bay with a
R suitable temperature measuring device.
R
R (3) If the temperature in the aircraft avionics bay is between -40 deg.C
R (-40.00 deg.F) and -15 deg.C (+5.00 deg.F):
R
R - do not energize the aircraft electrical circuits before the related
R computer systems circuit breakers are open.
R
4. Procedure_________
Subtask 12-31-21-660-051
A. Pre-conditioning Recommendations
R (1) If the avionics bay temperature is equal to or less than -40 deg.C (-
R 40.00 deg.F) you must do the pre-conditioning through the LP ground
connector (Ref. TASK 12-33-21-618-001).
(2) If the avionics bay temperature is between -15 deg.C (+5.00 deg.F)
and -40 deg.C (-40.00 deg.F) you must do the pre-conditioning
through:
R
R - the LP ground connector (Ref. TASK 12-33-21-618-001) or,
R
R - the HP ground connector (Ref. TASK 12-33-21-618-001).
NOTE : When you do the pre-conditioning through the HP ground____
connector:
-it is possible to operate the avionics bay computers in this temperature range but incorrect operation of the computers can occur (Ref. TASK 12-31-31-660-001).
-
this may cause the pre-conditioning to stop.
-
this can be because of the temperature conditions and not necessarily through a technical malfunction.
(3) If the avionics bay temperature is above -15 deg.C (+5.00 deg.F)you must do the pre-conditioning:
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