07/07/25
Message Overview:
Message Name:
ATC COM INOP OR CPDLC COM INOP
| Message Code: | 232OBS001 |
| Effectivity: | All |
| System: | Communication |
| Associated CAS: | None |
| System Description: | 23-23-00 - Datalink System |
| Schematic Diagram: | SSM 23-23-00-101 - Datalink System (Option) |
| Wiring Diagram: | 23-23-01 - Datalink System (Option) |
Message Description:
ATC COM INOP or CPDLC COM INOP
Possible Causes:
- Improper configuration of the system.
- ICAO address not aligned with the aircraft registration.
- FAA Privacy ICAO Address (PIA) is used.
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- SB350-23-004 - MODIFICATION – DATALINK and SELCAL SYSTEM - Installation of DATALINK with selective calling (SELCAL) Option (C23-406)
- SB350-23-010 - MODIFICATION – DATALINK and SELCAL SYSTEM - Upgrade the Datalink System to Meet the Eurocontrol's Link 2000+ Requirement Option (C23-440)
- SB350-23-011 - MODIFICATION – Communications - Introduction of Future Air Navigation System (FANS) 1/A+ Options (C23-600)
Full Throttle Blog/Forum Articles/Infoservice/Newsletter:
Flight Operation Notifications Manual (FONM): None
Quick Links:
| Standard Aircraft Configuration for Maintenance | AMM 12-00-00-867-803 |
| Functional Test of the Datalink | AMM 23-23-00-720-801 |
| Configuration of the Controller Pilot Data link Communication (CPDLC) Aeronautical Telecommunications Network (ATN) Ground Facilities Address Post SB 350-23-04−23−004 | AMM 23-23-00-970-801 |
| Load the Encrypted Application Key (EAK) to the Datalink External Compensation-Unit | AMM 23-23-01-970-801 |
| Removal of the Datalink External Compensation-Unit | AMM 23-23-01-000-801 |
| Installation of the Datalink External Compensation-Unit | AMM 23-23-01-400-801 |
| Electrical/Electronic Safety Precautions | AMM 24-00-00-910-801 |
| Electrostatic-Discharge Safety Precautions | AMM 24-00-00-910-802 |
| Connect Electrical Power to the Aircraft | AMM 24-00-00-861-801 |
| Remove the Electrical Power from the Aircraft | AMM 24-00-00-861-802 |
| Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance System (TSS) Transponder Unit Mode "S" Address Strapping | AMM 34-43-03-280-801 |
| Air Traffic Control (ATC) Transponder Address Pin Strapping | AMM 34-54-01-820-801 |
Troubleshooting Recommendations:
- Verify the Air Traffic Control (ATC#2) Transponder Address Pin Strapping in accordance with AMM TASK 34-54-01-820-801.
NOTE: The most significant bit (MSB) of the ATC ID code is the left most bit of the ATC ID code. The least significant bit (LSB) of the ATC ID code is the right most bit of the ATC ID code. - Are the result correct?
- If YES, continue with the next step.
- If NO, repair as required and do the close out.
- Verify the (TCAS) and Traffic Surveillance System (TSS)Transponder Unit Mode “S” Address Strapping in accordance with AMM TASK 34-43-03-280-801.
- Are the result correct?
- If YES, continue with the next step.
- If NO, repair as required and do the close out.
- Verify the Datalink Service Provider Customer Configuration in accordance with the service provider documentation.
NOTE: This document is available by contacting the service provider directly. - Verify the Configuration of the Controller Pilot Data link Communication (CPDLC) in accordance with AMM 23-23-00-970-801 Post SB 350-23-004.
- Are the result correct?
- If YES, continue with the next step.
- If NO, repair as required and do the close out.
- Verify the Encrypted Application Key (EAK) to the Datalink External Compensation-Unit in accordance with AMM TASK 23-23-01-970-801.
- Are the result correct?
- If YES, continue with the next step.
- If NO, repair as required and do the close out.
- Do the close out.