(2)
BLOWER Pushbutton Switch AUTO - (pushbutton switch pressed): normal operation. In case of failure, the FAULT legend comes on amber. OVRD - (pushbutton switch released): the FAULT legend goes off, the OVRD legend comes on white. The blower fan 20HQ stops, the conditioned air inlet valve 21HQ and the skin exchanger isolation valve 24HQ open. All the other valves close, and the extract fan 18HQ continues to operate. If smoke is detected, both pushbutton switches are released. The conditioned air inlet valve 21HQ opens, the skin air outlet valve 22HQ partially opens. All the other valves close and the extract fan 18HQ continues to operate. The horn sounds to alert the ground crew in the event of low flow or overheat when the avionics ventilation system is in operation.
NOTE : If the ventilation system is defective or when the BLOWER and
____ EXTRACT pushbutton switches are released (OVRD legends on):
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VENTILATION Panel Figure 019
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-there are no more colored backgrounds on the EFIS displays.
8. BITE Test
_________ (Ref. Fig. 020, 021, 022) The built-in-test function is fully done by the software program. It monitors the operation of the AEVC and ensures that the inputs are correct. The data which are known as incorrect are kept in the EEPROM. The BITE can operate during aircraft energization and permanently. The CFDIU can also monitor the BITE.
R **ON A/C 001-049, 051-060, 101-101,
A. AEVC power-up test
(1) Conditions of power-up test initialization
(a)
Necessary computer de-energization time:
-1 sec.
(b)
A/C configuration:
-A/C on ground
-VENTILATION section of the panel 22VU: BLOWER and EXTRACT pushbutton switches in AUTO configuration (pushed)
-CABIN PRESS section of the panel 25VU: DITCHING pushbutton switch released (the ON legend is off)
NOTE : When the BLOWER and EXTRACT pushbutton switches are
____ released (the OVRD legends are on) and the DITCH pushbutton switch is pushed (the ON legend is on), the power-up test is inhibited.
(2)
Progress of power-up test
(a)
Duration:
-85 sec.
(b)
Cockpit repercussions (ECAM warning, audio warning,pushbutton flashing... if any...):
-VENTILATION section of the panel 22VU: FAULT legend of the BLOWER and EXTRACT pushbutton switches comes on amber
-EMER ELEC PWR section of the panel 21VU: SMOKE legend of the GEN 1 LINE pushbutton switch comes on
-ECAM PRESS page: Skin valves move to fully open position
(3)
Results of power-up test
(a)
Test passed:
-No message
(b)
Test failed:
TEST Procedure from the CFDS Figure 020
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LAST LEG REPORT from the CFDS Figure 021
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CLASS 3 FAULTS from the CFDS
Figure 022
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1 1 Aug 01/04
1 1
1CES 1
-MASTER CAUT light on with single chime
-
ECAM warning:
VENT AVNCS SYS FAULT
-
ECAM PRESS page:
Normal display
R 1EFF : 001-049, 051-060, 101-101, 1 21-26-00Page 51 1 1 May 01/05 1 1 1CES 1 AVIONICS EQUIPMENT VENTILATION - MAINTENANCE PRACTICES
______________________________________________________
TASK 21-26-00-860-001
Configuration of the Avionics Compartment Ventilation System
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