Message Name:

NO L-GP-5 BUS INPUT

Message Code:

B3-006684

Associated CAS:

FLAPS FAULT
(Advisory)

No data from from Left Input/Output Concentrator (IOC) L-GP-5 bus.

• Left Input/Output Concentrator (IOC) (A4-IOC1)
• Flap Control Unit (FCU) (A124)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-27-0058 - Flap Control Unit - CAS Messages Reset procedure (20501 to 20999)

Forum Articles/Infoservice/Newsletter: None

In the MDC system parameters, an FPU PRESS XDCR SIGNAL showing 3740 PSI indicates the FCU have detected a malfunction in the system and have stop sending the excitation signal to the FPU pressure transducer.

MDC REPORT: SYSTEM PARAMETERS
FILENAME:
DATE:
...
FLAP SURFACE ANGLE - 3.74 DEG
FPU PRESS XDCR SIGNAL - 3740 PSI
APU HOURS - 1116.75 HRS
…

Source of the problem still has to be found.

1. Reset the following circuit breakers:

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

   FLAP R IND	CB2-B12
   FLAP L IND	CB1-B13
   FLAP CTRL	CB1-B14

2. Reset the FCU by pressing the FCU reset button on the MAINTENANCE TEST control-panel. If unable to reset, engage the Alternate Flaps button with the left hydraulic system pressurized, and attempt another reset using the Flap Reset switch on the left galley.

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

3. Swap the IOCs.

   1. If fault follow, replace defective IOC. Do system checks and close out.
   2. If fault remains on left side, continue with next step.

4. Check the L-GP-5 bus wiring integrity between L IOC and FCU per AWM.

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

5. Replace FCU per AMM.

   1. If system checks are good, do close out.