Message Name:

NO L-PFD-3 BUS OUTPUT

Message Code:

B3-007337

Associated CAS:

None

Left PFD data bus (L-PFD-3) is reported failed by 2 of the following: left MFD, right PFD and left MFD.

• Adaptive Flight-Display Unit 'A429 output' (L PFD) (A27)
• Adaptive Flight-Display Unit 'A429 input' (R PFD) (A26)
• Adaptive Flight-Display Unit 'A429 input' (R MFD) (A28)
• Adaptive Flight-Display Unit 'A429 input' (L MFD) (A29)
• Junction Box 4 (JB4)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Reset L PFD Circuit Breaker CB1-C3, L MFD Circuit Breaker CB1-C5, R PFD Circuit Breaker CB2-C3 and R MFD Circuit Breaker CB2-C5. Is the fault message still present?

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

2. Swap L PFD (A27) with R PFD (A26). Is the fault message still present?

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

3. Do wiring check between L PFD, through JB4, and the 3 others Adaptive Flight-Display Units for the following wires:

   From:	To:	Results:
   Conn. A27P2 - 94	Conn. A29P2 - 26
   Conn. A27P2 - 95	Conn. A29P2 - 27
   Conn. A27P2 - 94	Conn. A26P1 - 55
   Conn. A27P2 - 95	Conn. A26P1 - 56
   Conn. A27P2 - 94	Conn. A28P1 - 55
   Conn. A27P2 - 95	Conn. A28P1 - 56

   1. If the check is not satisfactory, repair defective wiring or replace defective JB4.
   2. If the check if satisfactory, continue with next step.

4. Disconnect R PFD (A26). Is the fault message still present?

   1. If NO, replace defective R PFD (A26).
   2. If YES, reconnect R PFD and continue with next step.

5. Disconnect R MFD (A28). Is the fault message still present?

   1. If NO, replace defective R MFD (A28).
   2. If YES, reconnect R MFD and continue with next step.

6. Disconnect L MFD (A29). Is the fault message still present?

   1. If NO, replace defective L MFD (A29).
   2. If YES, reconnect L MFD and continue with next step.

7. Do close out.