Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 333; Flight Crew Type 3500
Communication Breakdown; Workload; Troubleshooting
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Other / Unknown
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem
Aircraft
We experienced a temporary lost communications situation on departure from Oakland on [date] at approximately [time] Z. We were cleared the COAST 9 Departure and heading to ZZZ. There were no radio issues prior Oakland Tower's hand off to Departure. When attempting to acknowledge the hand off; it became clear that there was a problem. The Captain assumed control of the aircraft and leveled at 2;000 ft. per the initial hold-down. I assumed Pilot Monitoring duties and attempted to make contact with Oakland Tower; Departure; and any station on Guard on both VHF 1 and 2. We were apparently receiving intermittently and not transmitting at all. It sounded like a stuck MIC whenever we tried to transmit. The Captain directed squawking 7600 and initiated the published lost communication procedure. Shortly after turning to the south; I tried Tower one more time; this time with the audio panel hot MIC switches in the center; off position. Whether this last action resolved the problem directly is uncertain; but communication was restored. Upon establishing contact with Oakland Departure I inquired about returning to our originally issued squawk code. Communications for the rest of the flight were normal. Upon landing at ZZZ we called the Oakland Tower to ensure there were no open issues to discuss. Maintenance conducted numerous tests but was unable to duplicate the problem. After being cleared; we flew the aircraft two more legs that day without further communication difficulty.
Air carrier flight crew reported that a radio malfunction resulted in a temporary loss of communications with ATC on departure.