On a B757-200 on leveloff at 10000 ft it was discovered the captain's audio and VHF communications w...

Attributes
ACN	429729
Time
Date	199902
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	429729
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : provided flight assist flight crew : landed as precaution none taken : unable other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After takeoff from dfw we were instructed to contact departure. The first officer was flying so I switched frequencys. I tried several times to contact them with no response. I checked to be sure the correct frequency was set. After several more attempts, I switched back to dfw tower and tried to contact them. We realized we were not hearing any xmissions on either frequency. Thinking the left VHF was inoperative, we both switched to the right VHF. We were still unable to contact departure and we were not receiving any xmissions on the right VHF either. We leveled at 10000 ft, our assigned altitude, and set the transponder to 7600. The WX was VMC. We made a turn to the northwest with ama being the first point on our route, but intended to return to dfw. I sent a message to dispatch so they could advise ATC of our intentions to return to dfw. We continued to switch radios and the first officer was eventually able to contact dfw tower using the right VHF. They relayed between us and approach control until we got back into tower's airspace. I was unable to transmit or receive on either radio and could only hear using the first officer's speaker. We landed without incident and returned to the gate. Maintenance discovered the captain's microphone switch inside the control yoke was stuck in the transmit position. The switch was replaced and the flight continued to hdn.

Original NASA ASRS Text

Title: ON A B757-200 ON LEVELOFF AT 10000 FT IT WAS DISCOVERED THE CAPT'S AUDIO AND VHF COMS WERE INOP CAUSED BY A YOKE SWITCH FAILED IN THE XMIT POS. ACFT RETURNED TO DFW.

Narrative: AFTER TKOF FROM DFW WE WERE INSTRUCTED TO CONTACT DEP. THE FO WAS FLYING SO I SWITCHED FREQS. I TRIED SEVERAL TIMES TO CONTACT THEM WITH NO RESPONSE. I CHKED TO BE SURE THE CORRECT FREQ WAS SET. AFTER SEVERAL MORE ATTEMPTS, I SWITCHED BACK TO DFW TWR AND TRIED TO CONTACT THEM. WE REALIZED WE WERE NOT HEARING ANY XMISSIONS ON EITHER FREQ. THINKING THE L VHF WAS INOP, WE BOTH SWITCHED TO THE R VHF. WE WERE STILL UNABLE TO CONTACT DEP AND WE WERE NOT RECEIVING ANY XMISSIONS ON THE R VHF EITHER. WE LEVELED AT 10000 FT, OUR ASSIGNED ALT, AND SET THE XPONDER TO 7600. THE WX WAS VMC. WE MADE A TURN TO THE NW WITH AMA BEING THE FIRST POINT ON OUR RTE, BUT INTENDED TO RETURN TO DFW. I SENT A MESSAGE TO DISPATCH SO THEY COULD ADVISE ATC OF OUR INTENTIONS TO RETURN TO DFW. WE CONTINUED TO SWITCH RADIOS AND THE FO WAS EVENTUALLY ABLE TO CONTACT DFW TWR USING THE R VHF. THEY RELAYED BTWN US AND APCH CTL UNTIL WE GOT BACK INTO TWR'S AIRSPACE. I WAS UNABLE TO XMIT OR RECEIVE ON EITHER RADIO AND COULD ONLY HEAR USING THE FO'S SPEAKER. WE LANDED WITHOUT INCIDENT AND RETURNED TO THE GATE. MAINT DISCOVERED THE CAPT'S MIKE SWITCH INSIDE THE CTL YOKE WAS STUCK IN THE XMIT POS. THE SWITCH WAS REPLACED AND THE FLT CONTINUED TO HDN.

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.

On a B757-200 on leveloff at 10000 ft it was discovered the captain's audio and VHF communications were inoperative caused by a yoke switch failed in the transmit position. Aircraft returned to dfw.