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B777 flight crew reported loss of data link on a trans-pacific flight that affected their communications with the dispatcher.
| Attributes | |
| ACN | 1518692 |
| Time | |
| Date | 201802 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | RJJJ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| 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 | Air/Ground Communication |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 12950 Flight Crew Type 2000 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 180 Flight Crew Total 9733 Flight Crew Type 3049 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural MEL |
Narrative:
Approaching kalig intersection 4 hours into flight; datalink lost EICAS followed eventually by 'satcom lost' message. Was unable to get ETOPS weather from dispatch; so it was relayed through another [company] flight on air to air 123.45.the sat-ir was deferred. We were unable to reach dispatch through ldoc (long distance operational control) on the right HF radio when removed from data mode. The left HF radio was being used for primary communication with tokyo. Since we were unable to maintain cpdlc login or communicate with dispatch through the ACARS or right HF radio; we logged off of sat and attempted to connect the sat-ir which was successful. We were able to place calls; but was unable to receive calls from dsp. Sat-ir was used to provide position reports to dispatch. When close to alaska with VHF coverage; associated systems started working again.
Original NASA ASRS Text
Title: B777 flight crew reported loss of data link on a trans-Pacific flight that affected their communications with the Dispatcher.
Narrative: Approaching KALIG intersection 4 hours into flight; Datalink lost EICAS followed eventually by 'SATCOM lost' message. Was unable to get ETOPS weather from Dispatch; so it was relayed through another [Company] flight on air to air 123.45.The SAT-IR was deferred. We were unable to reach Dispatch through LDOC (Long Distance Operational Control) on the right HF radio when removed from DATA mode. The Left HF radio was being used for primary communication with Tokyo. Since we were unable to maintain CPDLC login or communicate with Dispatch through the ACARS or right HF radio; we logged off of SAT and attempted to connect the SAT-IR which was successful. We were able to place calls; but was unable to receive calls from DSP. SAT-IR was used to provide position reports to Dispatch. When close to Alaska with VHF coverage; associated systems started working again.
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.