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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.

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04/22/21

Message Overview:

Message Name:

OIL FILTER BLOCKAGE
(Service Message)

Message Code:

B3-302981

Associated CAS:

None

Reporting LRU: R ENG OIL SYS
System Description: 79-30-00
Schematic Diagram: 79-31-00
Wiring Diagram: None

Message Description:

Right engine oil filter blockage.

[MCID 1010]
Oil filter blockage.
A blockage of the oil filter that results in impending bypass of the oil filter was sensed.

Possible Causes:

  • Oil Filter Assembly
  • Contaminated Oil System
  • Oil Filter By-pass Valve

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Engine Electronic Control Unit (ECU) AMM 76-10-05-000-801
Installation of the Engine Electronic Control Unit (ECU) AMM 76-10-05-400-801
Removal of the Oil Pump AMM 79-21-01-000-802
Installation of the Oil Pump AMM 79-21-01-400-802
Removal of the Oil Filter AMM 79-21-05-000-801
Installation of the Oil Filter AMM 79-21-05-400-801
Removal of the Chip Detector AMM 79-21-09-000-801
Installation of the Chip Detector AMM 79-21-09-400-801
Removal of the Oil Filter Bypass-Indicator AMM 79-31-01-000-802
Installation of the Oil Filter Bypass-Indicator AMM 79-31-01-400-802
Removal of the Oil Temperature Transducer AMM 79-31-05-000-801
Installation of the Oil Temperature Transducer AMM 79-31-05-400-801
Removal of the Oil Pressure Transducer AMM 79-31-09-000-801
Installation of the Oil Pressure Transducer AMM 79-31-09-400-801
Removal of the Oil Level Probe AMM 79-31-13-000-801
Installation of the Oil Level Probe AMM 79-31-13-400-801
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. MCID 1010 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-170-A01.
  2. Honeywell recommends the troubleshooting and corrective action at the first opportunity to follow an oil filter impending bypass indication. If, abnormal debris is found in the filter or the time since the last filter change is unusually short, the engine can be operated a maximum of 10 hours. This applies if the criteria that follows is met:

    • No chips light.
    • The engine vibration levels are normal.
    • The oil temperature, pressure and other engine parameters are normal.
    • The opposite engine operating parameters are normal.

  3. If an oil filter impending bypass indication has occurred and the above specifications are not met contact the Honeywell Customer Support Engineer before departure.

Procedure

  1. Was an impending bypass flag with by a chip detector flag (panel indication)\?

    1. If YES, (Refer to LEMM SUBTASK 72-00-00-750-002, Testing).
    2. If NO, continue at Step 2.

  2. Remove the oil filter and back flush for contaminates. (Refer to LEMM SUBTASK 72-00-00-610-002, Servicing.)
    - Were contaminates found\?

    1. If YES, make analysis of the contaminates found. (Refer to LEMM SUB TASK 72-00-00-610-002, Servicing.) Replace the oil filter. (Refer to LEMM TASK 79-20-01-440-801, Assembly.) Find and correct the cause of the clogged filter.
    2. If NO, Continue at Step 3.

  3. Do an impending oil bypass valve circuit system check.

    1. Disconnect and examine the OIL IMP BYP connector W4P9 for damaged wires and other damage. (Refer to LEMM TASK 76-10-01-050-801, Removal).
    2. Do a resistance check as shown in the list below. The resistance must be more than 10KΩ. If not, replace the switch.

      Connector Pin Reading
      W4P9 1, 2 10,000 Ω

    3. Remove the oil bypass valve. (Refer to LEMM TASK 79-30-01-050-801, Removal).
    4. With the piston pushed, measure the resistance at the OIL IMP BYP connector W4P9. The resistance must be less than 5Ω. If not, replace the switch.
    5. Disconnect and examine the INTERFACE connector W4P1 and the INTERFACE connector W6P5 for damaged wires and other damage. (Refer to LEMM TASK 76-10-01-050-801, Removal).
    6. Do a continuity check as shown in the list below.

      Connector Pin Connector Pin Reading
      W4P9 1 W6P2 73 1> Ω
      W4P9 2 W6P2 74 1> Ω
      W4P9 1 W6P3 73 1> Ω
      W4P9 2 W6P3 74 1> Ω

      There are no open circuits are allowed.

    7. Install the oil impending bypass valve. (Refer to LEMM TASK 79-30-01-450-801, Installation).
    8. Reconnect all the connectors. (Refer to LEMM TASK 76-10-01-450-801, Installation).

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