Becker Avionics
Operation
Built-In Tests
DV64440.03 Issue 09 November 2019
ACU6100
61
3.15 Built-In Tests
•
The ACU61 device has different built-in tests with optical indication of the test results.
•
The tests monitor the system equipment and some internal circuits.
o
PBIT: A system self-test starts after power-on.
o
CBIT: A background test routine runs continuously during normal operation.
o
IBIT: An additional test can be manually started.
Power-on Build-In Test (PBIT)
Power-on Build-In Test (PBIT)
•
The ACU6100 powers up with the main system power.
•
The test routine will be started (test time ca. 4 s).
o
The test status LED (yellow) is on.
•
After successful test without failure the test status LED is off.
•
If a failure was found the test status LED (yellow) flashes.
There are two procedure to continue, if a failure was found:
•
(1) Push at the “TEST” button the failure will be ignored.
o
If there is permanent problem inside the system, it will be found by
the continuous self-test routine and indicated again.
•
(2) Set the "BACK-UP" switch to slaved or emergency mode (details see
"Emergency Operation" page 60).
Continuous Build-In Test (CBIT)
Continuous Build-In Test (CBIT)
•
A background test routine runs continuously during normal operation.
•
If a failure was found the test status LED (yellow) flashes.
There are two procedure to continue, if a failure was found:
•
(1) Push at the “TEST” button the failure will be ignored.
o
If there is permanent problem inside the system, it will be found by
the continuous self-test routine and indicated again.
•
(2) Set the "BACK-UP" switch to slaved or emergency mode (details see
"Emergency Operation" page 60).
Initiated Build-In Test (IBIT)
Initiated Build-In Test (IBIT)
•
An additional test can be manually started.
•
Push the key "TEST" (not during transmission).
•
If a failure was found the test status LED (yellow) flashes.
There are two procedure to continue, if a failure was found:
•
(1) Push at the “TEST” button the failure will be ignored.
o
If there is permanent problem inside the system, it will be found by
the continuous self-test routine and indicated again.
•
(2) Set the "BACK-UP" switch to slaved or emergency mode (details see
"Emergency Operation" page 60).
