R **ON A/C 106-149, 301-399, 401-499,
C. Description The EPSUs and the CIDS use a RS232 interface for the data exchange of both BITE functions. You can start the two different BITE functions only on the ground with a related CFDS/MCDU test menu page. Additionally the start of the battery capacity test is code protected against inadvertent action, because the batteries are discharged during the battery capacity test. The EPSUs only accept the test start commands when the subsequent conditions are fulfilled:
-aircraft on ground,
-all emergency lights OFF,
-28 V DC available,
-115 V AC available,
-control switch 'EMER EXIT LT' 4WL in OFF position,
-pushbutton 'EMER' on the FAP in OFF position,
-control switch 'NO SMOKING' 190RH in OFF position.
(1)
System Test
(Ref. Fig. 014, 015, 016)
When you start the system test via a CFDS/MCDU test page action the CIDS transmit the 'EPSU SYS TEST' data word through the related DEU Bs to the EPSUs. When the 'EPSU SYS TEST' data word is accepted the EPSUs are set to the system test mode. When the EPSUs can start the system test the status message 'TEST IN PROGRESS' is send to the CIDS. The system test will be completed within approximately 60 seconds. When the system test is completed the test results are sent to the CIDS and shown as a test result message on the CFDS/MCDU. When the EPSUs cannot start the system test the reason for not starting the system test is sent to the CIDS and shown as a status message on the CFDS/MCDU.
(2)
Battery Capacity Test
(Ref. Fig. 017, 018)
You can start the battery capacity test via a CFDS/MCDU test page action. The test start procedure is protected against accidental operation with a code. When the EPSUs accept the code you can start the battery capacity test and the EPSUs are set to the battery capacity test mode. The status message 'EPSU BAT CAP TEST IN PROGRESS' is sent to the CFDS/MCDU.
EPSU System Test - MCDU Start Menu
Figure 014
MCDU Failure Page (1/2)
Figure 015
MCDU Failure Page (2/2)
Figure 016
EPSU Battery Capacity Test - MCDU Menu Pages (1/2)
Figure 017
EPSU Battery Capacity Test - MCDU Menu Pages (2/2)
Figure 018
Before the main battery capacity test starts a system test is
automatically done. If there is a system failure the battery capacity
test is stopped.
When the battery capacity test is started during high environmental
temperature conditions, e.g. Aircraft in sunlight without Air
Conditioning and the battery temperature exceeds more than 45 deg.C,
the test is delayed.
When the temperature falls to a normal day profile, the normal
battery test cycle continous. The message on the MCDU remains for
information.
The maximum time for a delayed battery capacity test is 24 hours.
After a delay of more than 24 hours, the battery capacity test is
stopped.
D. Operation
(1)
System Test You can start the system test of the emergency lighting system when you select the 'CIDS' main menu through the 'CFDS SYSTEM REPORT TEST' menu page. In the 'CIDS' main menu you have to select the 'SYSTEM TEST' menu page. When you push the 'EPSU SYS TEST' line select key of the 'SYSTEM TEST' menu the 'EPSU SYS TEST' menu comes on and shows the subsequent data:
-initial conditions of starting the system test,
-
< START,
-
< RETURN.
When you set the 'START' line key and the system test starts, the
message 'TEST IN PROGRESS XXs' comes on. When the system test cannot
start, a status message shows the reason for not start the test.
When the system test is completed, a test result message comes on.
(2)
Battery Capacity Test You can start the 'EPSU BAT CAP TEST' of the emergency lighting system, when you select the 'CIDS' main menu through the 'CFDS SYSTEM REPORT TEST' menu page. When you push the 'EPSU BAT CAP TEST' line key, the 'EPSU BAT CAP TEST 1/2' page comes on and shows the subsequent data:
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