L ENGINE OIL BYPASS
(Advisory)

The cyan 'L ENGINE OIL BYPASS' advisory CAS message indicates the respective engine oil filter is impending bypass.

• When the oil pressure is between 45 and 55 psi, the bypass indicator sends a signal to the ECU A and B channels to post the 'R ENGINE OIL BYPASS' message on the EICAS.
• The bypass valve begins to open at 65 psid and reaches full flow bypass at a differential pressure of 150 psid. During bypass mode, the system still provides a minimum filtration level of 500 microns by means of accessible last chance screens.

The bypass valve begins to open at 65 psid and reaches full flow bypass at a differential pressure of 150 psid. During bypass mode, the system still provides a minimum filtration level of 500 microns by means of accessible last chance screens.

• 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:B3-303616 - OIL FILTER BYPASS 4 [L ENG OIL FILTER]