03/24/21
Message Overview:
Message Description:
R-AHC-3 data absent at L-MFD and L-PFD is OFF.
Possible Causes:
- Attitude Heading Computer (AHC) (A12)
- Adaptive Flight-Display Unit (MFD) (A29)
- Adaptive Flight-Display Unit (PFD) (A27)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- ATA Chapter = 34-25
- Message# = 18
- {Term Definitions}
- MFD1-23 1X 351 NA EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 351: 15;NO R-AHC-3 INPUT
- PFD1-1 1X 350 NA ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;
Quick Links:
| Removal of the Adaptive Flight-Display Unit | AMM 31-61-01-000-801 |
| Installation of the Adaptive Flight-Display Unit | AMM 31-61-01-400-801 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
| Electrical Connectors - Maintenance Practice - ALL | SPM 20-20-00-02 |
Troubleshooting Recommendations:
- Equ Note = L-MFD RVSN; L-PFD OFF
- Suspect failed R-AHC-3 output, failed L-MFD or L-PFD input, or wiring. Verify L-PFD is OFF or REVERTED.