L ENGINE FUEL BYPASS
(Advisory)

The cyan 'L ENGINE FUEL BYPASS' advisory CAS message indicates the left engine fuel filter is impending bypass.

• The fuel filter module is equipped with a pressure delta switch that transmits a signal to the engine ECU to indicate an impending clogged main fuel filter.
• A fuel filter bypass valve provides assurance that fuel flow will continue to the engine in the event that pressure across the filter exceeds levels that may interrupt continuous fuel flow.
• The bypass valve open point is set >26 psid, the impending bypass indicator is set at 13.5 ±2.5 psid. This provides the aircraft operator sufficient time to complete the current flight prior to servicing the filter.

• None

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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1. Interrogate the MDC as follows:

   1. On the cursor control panel, ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. The MDC main menu should now be displayed on Display Unit #3.
   2. Using the joystick, select Current Faults (if the fault is active) or Aircraft History to research stored faults. From Aircraft History you can then select Fault Message History and locate the air condition fault logged.
   3. Select the MDC fault from the drop down below to provide additional information to assist in troubleshooting.
      Select an MDC Fault Code/Message:B3-303005 - FUEL TEMP/BYPASS 4 [L ENG FUEL T/B]