07/01/21
Message Overview:
Message Name:
AUTOMATIC DIRECTION FINDER (ADF) SYSTEM NO DATA
| Message Code: | 345OBS004 |
| Effectivity: | All |
| System: | Automatic Direction Finder (ADF) System |
| System Description: | 34-52-00 |
| Schematic Diagram: | 34-52-00 [ Global Express ] [ G5000 ] [ GlobalXRS ] |
| Wiring Diagram: | 34-52-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
The Automatic Direction Finder (ADF) System cannot receive guidance data.
Possible Causes:
- Automatic Direction Finder (ADF) Radio Module
- Automatic Direction Finder (ADF) 1 Antenna (Top) (E3)
- Automatic Direction Finder (ADF) 2 Antenna (Top) (E4)
- Very High Frequency (VHF) Navigation Unit 1 (A3)
- Very High Frequency (VHF) Navigation Unit 2 (A4)
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
NOTE: The ADF radio module is not an LRU. It is installed in the VHF NAV unit. The optional VHF NAV unit 3 does not contain an ADF radio module.
NOTE: When the radio system is initially energized (after a cold-start and during a WOW condition), it automatically starts the POST. The POST does an RMU test, RSB continuity test, and radio module test. The POST does not do a test of the antennas or coaxial cables.
NOTE: If the RMU display shows CHK RMU 1-2, or, if the RMU displays are magenta, do the fault isolation for the radio management units before continuing with the procedure.
Quick Links:
| Connect Electrical Power to the Aircraft | AMM 24-00-00-861-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Remove the Electrical Power from the Aircraft | AMM 24-00-00-861-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Electrical/Electronic Safety Precautions | AMM 24-00-00-910-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Operational Test of the Digital Bus System | AMM 31-44-00-710-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the VHF Navigation Units | AMM 34-51-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the VHF Navigation Units | AMM 34-51-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Operational Test of the Automatic Direction Finder (ADF) System |
AMM 34-52-00-710-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Automatic Direction Finder (ADF) Antennas |
AMM 34-52-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Automatic Direction Finder (ADF) Antennas |
AMM 34-52-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Access to System Diagnostics | AMM 45-45-00-970-804 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- On the RMU display, look on the applicable maintenance log page(s) for the messages that follows:
Event Description Maintenance Page
(Radio or cluster module)Event Code ADF DATA Radio 27, A7 ADF RCVR Radio AA, AB ADF TUNE Radio 28, A8, 2C CODE ERR Cluster A5 COMPUTER Cluster 06, 07, 08, 09, 86, 87, 88, 89, A4 COMPUTER Radio 06, 07, 08, 09, 23, 24, 86, 87, 88,
89, A3, A4, A5DATA BUS Cluster, Radio 03, 04, 05, 83, 84, 85 FPGA ERR Cluster B0 OVERHEAT Radio 2D, AD PWR SPLY Radio 21, 22, A1, A2 RAM ERR Cluster A1, A2, A3, 2A RSB PRI Cluster AB RSB SEC Cluster AC RSB TX Cluster AD, AE STRAPS Cluster A6 - If the messages are not found, do close out.
- If one or more of the given messages are found, replace the VHF NAV unit 1-2 and continue with next step.
- On the RMU display, look on the applicable maintenance log page for the message that follows:
Event Description Maintenance Page
(Radio or cluster module)Event Code ADF RCVR Radio A9 - If the given message is not found, do close out.
- If the given message is found, continue with next step.
- Perform a visual check of the ADF Antennas and related coaxial cables.
- If the components are not defective, repair the defective coaxial cables as required and do close out.
- If the components are defective, continue with next step.
- Replace the defective ADF Antenna.
- Do close out.