Fault Message:

GEN2 DRIVE SHAFT FAIL/INVALID % N2

Fault Code:

2422200LPS

Associated CAS:

GEN 2 FAIL
(Advisory)

Variable Frequency Generator (VFG) 2 has tripped off-line or will not come on-line.

• Generator Control Unit (GCU) 2 (A57)
• Variable Frequency Generator (VFG) 2 (G2)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-24-0598 - Variable Frequency Generator (VFG) GL511-1103-9 - Failure

Forum Articles/Infoservice/Newsletter: 

• Reference Instruction Letter (RIL) GX-0198 - Return to service following VFG bearing failure and/or VFG housing rupture.

NOTES:

• Prior to T/S procedures, perform a visual of generator 2 for heat distress. Confirm if the heat exchanger is blocked  with FOD.
• A GCU patch cable (GSE REF # 24X-24-02) can be used to swap 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. Access CAIMS and check if the following faults are active:

   • 2422126LPS - GEN2 OIL OVERTEMP FAULT
   • 2422124LPS - GEN2 [DIFF PROTECTION FEEDER]

   Inspect the VFG for the following:

   • VFG oil filter bypass indicator tripped, and/or
   • Metal particles in the oil lines, and/or
   • VFG end frame cracked or breached, and/or
   • Oil sight glass cracked

   1. If there is a combination of the listed CAIMS fault messages and VFG condition(s) perform RIL GX-0198
   2. If there is NO combination, continue with next step.

2. Do a visual inspection of VFG 2. Is the drive shaft broken or sheared?

   1. If YES, investigate the cause and replace VFG 2
   2. If NO, continue with next step.

3. Interchange GCU 2 with GCU 3 (physically or using the GCU patch cable).
   NOTE: Use CAIMS to monitor the fault on GCU.

   1. If system checks are good, replace GCU 2 and do close out.
   2. If fault remains, continue with next step.

4. Disconnect VFG 2 connector G2P1 and GCU 2 connector A57P1. Do a continuity check as follows:

   From	To	Result
   A57P1-E	Ground
   A57P1-F	Ground
   A57P1-G	Ground

   1. If there is continuity, repair defective wiring as required.
   2. If there is NO continuity, continue with next step.

5. Do a continuity check between VFG 2 and GCU 2 as follow:

   From	To	Result
   A57P1-E	G2P1-G
   A57P1-F	G2P1-C
   A57P1-G	G2P1-L

   1. If there is continuity, continue with next step.
   2. If there is NO continuity, repair defective wiring as required.

6. Disconnect connector A54P7 (ACPC) and connector A57P2 (GCU 2). Perform a wiring check between A57P2 and A54P7 as follows:

   From	To	Result
   A57P2-9	A54P7-a
   A57P2-15	A54P7-b

   1. If wiring checks are not good, repair wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

7. Replace VFG 2.
8. Do close out.