B777 captain reported being unable to log onto cpdlc enroute. They discovered the fix and corrected ...

Attributes
ACN	1395289
Time
Date	201610
Local Time Of Day	1801-2400
Place
Locale Reference	CZQM.ARTCC
State Reference	NB
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Oceanic
Flight Plan	IFR
Component
Aircraft Component	Communication Systems
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 13908 Flight Crew Type 6860
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

Aircraft was written up on inbound leg as follows: defect: no ACARS or cpdlc communicationaction: clear-no existing message for ACARS in current flight deck effects.all communications normal until we were unable to log onto cpdlc with moncton. We then gradually lost ACARS capability as we approached our coast out fix. We queried ATC and was advised no ads. Time critical as we approached coast out fix elsir. Fix discovered through flight manual bulletin concerning the X satlink system. After deactivating the X satlink and then logging onto Y satcom; all communication systems returned to normal ops.

Original NASA ASRS Text

Title: B777 Captain reported being unable to log onto CPDLC enroute. They discovered the fix and corrected the condition by deactivating Satlink and logging into the a different system.

Narrative: Aircraft was written up on inbound leg as follows: Defect: No ACARS or CPDLC communicationAction: CLR-No existing message for ACARS in current flight deck effects.All communications normal until we were unable to log onto CPDLC with Moncton. We then gradually lost ACARS capability as we approached our coast out fix. We queried ATC and was advised no ADS. Time critical as we approached coast out fix ELSIR. Fix discovered through Flight Manual Bulletin concerning the X Satlink system. After deactivating the X Satlink and then logging onto Y Satcom; all communication systems returned to normal ops.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B777 captain reported being unable to log onto cpdlc enroute. They discovered the fix and corrected the condition by deactivating satlink and logging into the a different system.