Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 86; Flight Crew Total 14000; Flight Crew Type 666
Workload; Troubleshooting; Human-Machine Interface; Communication Breakdown
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem; General Flight Cancelled / Delayed
Aircraft
After Takeoff on our climb up 2;500 ft. out of ZZZ; we lost the use of both VHF radios com1 and com2. We leveled off at 2;500 ft. worked the problem and the Captain was able to get com1 back by using the ALT switch. All the communications on the First Officer side of the plane had died I could not use the hot mic or communicate with ATC on my side I tired different headsets and nothing worked. We then decided to return to ZZZ since we were going out over the water on our way to ZZZ1. WE had to burn 14;000 lbs. of fuel to get under max landing weight. We ended up holding over ZZZ VOR since the weather in the area was raining and turbulent and ZZZ VOR was in the clear and smooth. We worked the Flight Attendant; Dispatch; Maintenance Control; and ATC; till we had burned off enough fuel to return to land in ZZZ. We kept the passengers informed of what was going on as much as we could during the entire event.
Air carrier First Officer reported that both VHF radios stopped working during departure; resulting in a diversion.