Narrative:

I was a captain [in training] working as pilot flying with a check airman conducting oe on me from the right seat as pilot monitoring. We also had a first officer in the observer's seat and a jumpseating first officer from another airline. The flight proceeded normally as did offloading/servicing of the aircraft. While receiving clearance; we noticed a strange feedback during transmissions from the right; pilot monitoring seat. Communications were still acceptable and on subsequent transmissions the feedback was not noticeable.takeoff and initial climb were all normal. However; around the time departure control handed us off to center; the pilot monitoring was unable to transmit on any radio. The pilot monitoring changed transmitters; frequencies; etc.; and was unable to regain transmit capability. I tried transmitting and also was unable to get out on any transmitter. We checked all the hand microphones; unplugged headsets and tried different audio control panels; push to talk switches; etc. Trying to isolate the offending component. As we did this; we lost the ability to receive on the left VHF radio and the left speaker (which I had been using) went dead. We then lost reception on the right VHF radio on any frequency.from the observer's seat; the first officer was able to communicate through a few transmissions on the center VHF; but that capability also then failed. Eventually we found ourselves without the ability to transmit on any of our communications radios from any push to talk or from any audio control panel. We were only able to receive on the center radio.I briefed the lost communications procedure for the arrival; however we finally established an ability to acknowledge and comply with ATC clearances received on the center VHF through the ident function of our transponder. Because we could still comply with ATC instructions we did not squawk 7600 and landed without deviation from any clearance. A follow-me vehicle was arranged to escort us to parking. We vacated the runway and began taxiing behind the follow-me. My speaker suddenly started blaring at high volume about a minute or so later. We regained the ability to transmit; tune and receive normally without any input or action from any pilot. We wrote up the communications radios and talked to the mechanic on site.nothing about this requires a report from the flight manual; and ATC did not seem particularly disturbed. No phone numbers were given. No regulations were violated. No company standards were violated. However; as I thought about the event and discussed it with the crew; I thought an as soon as possible would be a good idea. Since this issue started affecting unrelated communications equipment and speakers; it's conceivable a similar issue could recur or affect navigation or approach systems.

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Original NASA ASRS Text

Title: B767 Captain reported difficulties with all radio communication during flight.

Narrative: I was a Captain [in training] working as Pilot Flying with a check airman conducting OE on me from the right seat as Pilot Monitoring. We also had a first officer in the observer's seat and a jumpseating First Officer from another airline. The flight proceeded normally as did offloading/servicing of the aircraft. While receiving clearance; we noticed a strange feedback during transmissions from the right; Pilot Monitoring seat. Communications were still acceptable and on subsequent transmissions the feedback was not noticeable.Takeoff and initial climb were all normal. However; around the time departure control handed us off to Center; the Pilot Monitoring was unable to transmit on any radio. The Pilot Monitoring changed transmitters; frequencies; etc.; and was unable to regain transmit capability. I tried transmitting and also was unable to get out on any transmitter. We checked all the hand microphones; unplugged headsets and tried different audio control panels; push to talk switches; etc. trying to isolate the offending component. As we did this; we lost the ability to receive on the left VHF radio and the left speaker (which I had been using) went dead. We then lost reception on the right VHF radio on any frequency.From the observer's seat; the first officer was able to communicate through a few transmissions on the center VHF; but that capability also then failed. Eventually we found ourselves without the ability to transmit on any of our communications radios from any push to talk or from any audio control panel. We were only able to receive on the center radio.I briefed the lost communications procedure for the arrival; however we finally established an ability to acknowledge and comply with ATC clearances received on the center VHF through the ident function of our transponder. Because we could still comply with ATC instructions we did not squawk 7600 and landed without deviation from any clearance. A follow-me vehicle was arranged to escort us to parking. We vacated the runway and began taxiing behind the follow-me. My speaker suddenly started blaring at high volume about a minute or so later. We regained the ability to transmit; tune and receive normally without any input or action from any pilot. We wrote up the communications radios and talked to the mechanic on site.Nothing about this requires a report from the Flight Manual; and ATC did not seem particularly disturbed. No phone numbers were given. No regulations were violated. No company standards were violated. However; as I thought about the event and discussed it with the crew; I thought an ASAP would be a good idea. Since this issue started affecting unrelated communications equipment and speakers; it's conceivable a similar issue could recur or affect navigation or approach systems.

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.