Message Name:

NO OUTPUT

Message Code:

B3-007161

Associated CAS:

None

Left MFD data buses are reported absent by Left IOC and reported failed by 2 of the following: Left PFD, Right PFD, Right MFD, and RIU.

• Adaptive Flight-Display Unit (L MFD) (A29)
• L MFD Circuit Breaker (CB1-C5)
• Left Cockpit Breaker Panel (CBP1)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Reset L MFD Circuit Breaker CB1-C5. Is the fault message still present?

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

2. Swap L MFD (A29) with R MFD (A28). Is the fault message still present?

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

3. Confirm presence of the Ground, and the configuration discrete, at the left MFD (A29).
   

   Measurement at	Expected Result	Result	Notes
   Conn. A29P3 - E	GND		Power Ground
   Conn. A29P3 - C	GND		Chassis Ground
   Conn. A29P3 - F	GND		Chassis Ground
   Conn. A29P2 - 43	GND		Config. Disc.
   Conn. A29P2 - 46	GND		Config. Disc.
   Conn. A29P2 - 16	GND		Chassis Ground
   Conn. A29P2 - 25	GND		Chassis Ground

   1. If the check is not satisfactory, repair defective wiring.
   2. If the check is satisfactory, continue with next step.

4. Confirm presence of the 28 VDC at the left MFD (A29).
   

   Measurement at	Expected Result	Result
   Conn. A29P3 - G	28 VDC

   1. If the check is not satisfactory, continue with next step.
   2. If the check is satisfactory, do close out.

5. Do wiring check from L MFD (A29) to Left Cockpit Breaker Panel (CBP1) for the following wire:
   

   From:	To:	Result
   Conn. A29P3 - G	Conn. CBP1P/J2 - W

   1. If the check is satisfactory, continue with next step.
   2. If the check is not satisfactory, repair wiring.

6. Replace L MFD Circuit Breaker CB1-C5. Is the fault still present?

   1. If NO, do close out.
   2. If YES, replace defective left Cockpit Breaker Panel (CBP1).

7. Do close out.