Message Name:

NO LB-RIU-7 BUS INPUT

Message Code:

B3-007254

Associated CAS:

None

LB-RIU-7 data absent at L-NAV-ADF/VIR and NOT absent at L-DME. L-RIU is transmitting data to IOC.

• L NAV-4000 VOR/LOC/GS/MB/ADF Receiver 1 (VHF NAV) (A047)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

1. ATA Chapter = 34-51
2. Message# = 6
3. {Term Definitions}

   1. NAV1-3 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057A: 14;NO LB-RIU-7 BUS INPUT
   2. NAV1-9 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057V: 14;NO LB-RIU-7 BUS INPUT
   3. DME1-3 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057: 14;NO LB-RIU-7 BUS INPUT
   4. RIU1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;

1. Suspect failed L-NAV input or wiring. Inputs are pin 21, 22.