Narrative:

Cruising at FL350 near iiu, ATC notified us that our radios were full of static and almost unreadable. Suspecting a bad microphone, the captain substituted another microphone for his and reattempted to contact ATC still using the #1 radio. Transmission was still unreadable and the #2 radio was tried. It, too, was unreadable. The first officer attempted contact with his microphone and that, too, was unsuccessful. The so also tried to contact ATC on radios #1 and #2 and was also unsuccessful. We could hear ATC on both radios, but they could not hear our response. We sent an ACARS message to msp dispatch informing them of our problem and asking them to contact ATC and inform them of our problem. We proceeded on our flight plan as filed acknowledging further ATC instructions with an identify. We then tested the #3 radio and found that it, too, was inoperative with our handheld mikes. Finally, we attempted to communicate with center using the mikes in our oxygen masks and discovered that the captain's microphone worked on both radios #1 and #2. Consequently, verbal communication was re-established with ATC. With the concurrence of msp dispatch, we decided to land at msp. Further radio communication with ATC using the captain's oxygen mask microphone was successful, and the landing was uneventful.

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Original NASA ASRS Text

Title: WITH MULTIPLE COM PROBS A B727 CREW COORDS WITH THEIR DISPATCHER AND PROCEEDS TO A DIVERSION STATION.

Narrative: CRUISING AT FL350 NEAR IIU, ATC NOTIFIED US THAT OUR RADIOS WERE FULL OF STATIC AND ALMOST UNREADABLE. SUSPECTING A BAD MIKE, THE CAPT SUBSTITUTED ANOTHER MIKE FOR HIS AND REATTEMPTED TO CONTACT ATC STILL USING THE #1 RADIO. XMISSION WAS STILL UNREADABLE AND THE #2 RADIO WAS TRIED. IT, TOO, WAS UNREADABLE. THE FO ATTEMPTED CONTACT WITH HIS MIKE AND THAT, TOO, WAS UNSUCCESSFUL. THE SO ALSO TRIED TO CONTACT ATC ON RADIOS #1 AND #2 AND WAS ALSO UNSUCCESSFUL. WE COULD HEAR ATC ON BOTH RADIOS, BUT THEY COULD NOT HEAR OUR RESPONSE. WE SENT AN ACARS MESSAGE TO MSP DISPATCH INFORMING THEM OF OUR PROB AND ASKING THEM TO CONTACT ATC AND INFORM THEM OF OUR PROB. WE PROCEEDED ON OUR FLT PLAN AS FILED ACKNOWLEDGING FURTHER ATC INSTRUCTIONS WITH AN IDENT. WE THEN TESTED THE #3 RADIO AND FOUND THAT IT, TOO, WAS INOP WITH OUR HANDHELD MIKES. FINALLY, WE ATTEMPTED TO COMMUNICATE WITH CTR USING THE MIKES IN OUR OXYGEN MASKS AND DISCOVERED THAT THE CAPT'S MIKE WORKED ON BOTH RADIOS #1 AND #2. CONSEQUENTLY, VERBAL COM WAS RE-ESTABLISHED WITH ATC. WITH THE CONCURRENCE OF MSP DISPATCH, WE DECIDED TO LAND AT MSP. FURTHER RADIO COM WITH ATC USING THE CAPT'S OXYGEN MASK MIKE WAS SUCCESSFUL, AND THE LNDG WAS UNEVENTFUL.

Data retrieved from NASA's ASRS site as of July 2007 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.