Narrative:

After talking to tokyo on VHF 126.70 and told to contact radio on HF 13273 primary 11330 secondary there was an HF propagation problem. We were able to log on to rjjj center on cpdlc and receive HF selcals but were never able to establish HF with tokyo radio. We could hear them; but they could not receive us. Other aircraft could not receive our HF call either; but we were able to establish a relay with an aircraft on 123.45. Other aircraft were also having difficulty reaching tokyo radio also. We tried all combinations of radios; frequencies; microphones; captain and first officer sides to no avail. We contacted dispatch on satcom as there is no tokyo radio satcom number available. They were unable to reach anyone by land line either. After researching the pacific enroute charts; air carrier operational information in the commercial chart binder and all other documentation I could find I elected to continue the ETOPS portion of the flight. We had SELCAL; cpdlc and relays from other aircraft available as well as satcom with dispatch. Dispatch relayed a suggestion to us from maintenance to pull an HF circuit breaker; but I elected not to do so since we had one-way communication with the HF. I did not feel we were in any type of situation that lead me to disregard flight manual guidance regarding pulling circuit breakers in flight. Reaching the pazn boundary we received a cdplc message to contact commercial radio and received them loud and clear; with secal in check. Rest of the flight was uneventful.

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Original NASA ASRS Text

Title: A B777 was unable to transmit HF communications on a Pacific Oceanic flight but with CPDLC; SELCAL; radio relay and SATCOM with air carrier Dispatch were able to communicate satisfactorily.

Narrative: After talking to Tokyo on VHF 126.70 and told to contact radio on HF 13273 primary 11330 secondary there was an HF propagation problem. We were able to log on to RJJJ center on CPDLC and receive HF SELCALS but were never able to establish HF with Tokyo radio. We could hear them; but they could not receive us. Other aircraft could not receive our HF call either; but we were able to establish a relay with an aircraft on 123.45. Other aircraft were also having difficulty reaching Tokyo radio also. We tried all combinations of radios; frequencies; microphones; Captain and First Officer sides to no avail. We contacted Dispatch on SATCOM as there is no Tokyo radio SATCOM number available. They were unable to reach anyone by land line either. After researching the Pacific enroute charts; Air Carrier Operational Information in the commercial chart binder and all other documentation I could find I elected to continue the ETOPS portion of the flight. We had SELCAL; CPDLC and relays from other aircraft available as well as SATCOM with Dispatch. Dispatch relayed a suggestion to us from maintenance to pull an HF circuit breaker; but I elected not to do so since we had one-way communication with the HF. I did not feel we were in any type of situation that lead me to disregard flight manual guidance regarding pulling circuit breakers in flight. Reaching the PAZN boundary we received a CDPLC message to contact commercial radio and received them loud and clear; with SECAL in check. Rest of the flight was uneventful.

Data retrieved from NASA's ASRS site as of April 2012 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.