Message Name:

GEN1 [LOW OIL LEVEL]

Message Code:

2421230LPS

Associated CAS:

None

Low oil level in Variable Frequency Generator (VFG) 1 is detected by the remote oil level sensing, consequently resulting in Generator 1 being tripped off-line or not come on-line.

• Generator Oil Level Sensor
• Generator Control Unit (GCU) 1 (A56)
• Variable Frequency Generator (VFG) 1 (G1)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

• ForumNewsletter_Volume 17_Issue 18_September_10_2020 - Variable Frequency Generator (VFG) Oil System

Notice To Operators (NTO): None

Flight Operation Notifications Manual (FONM): None

A GCU patch cable (GSE REF # 24X-24-02) can be used to interchange GCUs 1, 4 and 5 into position 2 or 3 (for troubleshooting only). The GCU NVMs can only be downloaded at position #2 or #3.

1. Perform a check of the oil quantity in VFG 1 and service if required as per AMM TASK 24-12-00-210-802 - Visual Check of the Variable Frequency Generator (VFG) Oil System. Is the fault still present?

   1. If YES, continue with next step.
   2. If NO, do close out.

2. Disconnect GCU 1 connector A56P2 and VFG 1 connector G1P1. Do a continuity check as follows:
   

   From	To	Result
   A56P2-33	Ground
   A56P2-60	Ground

   1. If there is continuity, repair defective wiring as required and do close out.
   2. If there is no continuity, continue with next step.

3. Perform a continuity check as follows:
   

   From	To	Result
   A56P2-33	G1P1-K
   A56P2-60	G1P1-M

   1. If there is continuity, continue with next step.
   2. If there is no continuity, repair defective wiring as required and do close out.

4. Interchange GCU 1 with GCU 2. Is the fault still present?

   1. If YES, continue with next step.
   2. If NO, replace GCU 1 and do close out.

5. Replace VFG 1.
6. Do close out.