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Troubleshooting
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Select color for CAS message that you wish to troubleshoot

(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

For AOG assistance contact:

CRC Montreal (YUL)
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Swap Test Standard Practice

NOTE: An important caveat to this technique is the possibility of causing further damage, while swapping component from one side to the other one.  Ensure the other side is free of failure to avoid a more complex failure scenario to troubleshoot.  Also, while swapping an electrical system component from the APU System to the Right of Left side, it is to be expected that the fault will follow onto the system it is being swapped to. Make sure that this will not induce any operational constraints.

  1. After a successful Swap Test - install both LRUs to their original positions.

    1. If fault is clear, DO NOT REPLACE LRU and do close out.
    2. If fault remains, replace defective LRU.

  2. After an Unsuccessful Swap Test - install both LRUs to their original positions.

NOTE: A successful swap test means fault is transferred or gone.

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