B747-400
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification
Aircraft
I do not believe jamming was a factor. I believe there was a failure of the HF antenna. If I am correct; there is only one antenna for the two HF radios. The observer pilot was at rest during the initial stages of the event and was not involved in the decision making process. An example of how [to] deal with dual HF failure and a reference to where the Chief Pilot was able to coordinate our continuation would be helpful in either the [Jeppesen] notes or some other searchable publication. I felt the Captain did a thorough job of putting safety and regulatory compliance first and operational reliability second. In the future; I will start to check the HF radios to ensure that they will tune prior to departure.
Second narrative contained no additional information.
A Flight Crew reported they were unable to communicate via HF Radio and utilized CPDLC.