Narrative:

At approximately 14 mi southeast of ord, heading 360 degrees at 8000 ft, expecting a visual approach runway 27L, we experienced a stuck microphone. Elected to continue assigned heading and altitude while disconnecting first officer's pendant switch, head set and hand-held microphone. Squawked 7600. Had both TCASII and visual contact with other aircraft approaching ord from the north. Responded to a TCASII RA and turned northeast to heading 030 degrees where no TCASII targets were displayed. Equipment malfunction was resolved and ATC communications reestablished for a normal approach and landing. Airline maintenance in chicago replaced first officer's microphone selector panel and oxygen mask microphone panel. Aircraft returned to service. TCASII was very helpful in that it displayed a 'no target' area northeast of ord where we could go to resolve our communication problem.

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Original NASA ASRS Text

Title: ACR HAS STUCK MIKE WHILE ON APCH. DIVERTS TO PROBLEM SOLVE AS TCASII ACTIVATES.

Narrative: AT APPROX 14 MI SE OF ORD, HDG 360 DEGS AT 8000 FT, EXPECTING A VISUAL APCH RWY 27L, WE EXPERIENCED A STUCK MIKE. ELECTED TO CONTINUE ASSIGNED HDG AND ALT WHILE DISCONNECTING FO'S PENDANT SWITCH, HEAD SET AND HAND-HELD MICROPHONE. SQUAWKED 7600. HAD BOTH TCASII AND VISUAL CONTACT WITH OTHER ACFT APCHING ORD FROM THE N. RESPONDED TO A TCASII RA AND TURNED NE TO HDG 030 DEGS WHERE NO TCASII TARGETS WERE DISPLAYED. EQUIP MALFUNCTION WAS RESOLVED AND ATC COMS REESTABLISHED FOR A NORMAL APCH AND LNDG. AIRLINE MAINT IN CHICAGO REPLACED FO'S MICROPHONE SELECTOR PANEL AND OXYGEN MASK MICROPHONE PANEL. ACFT RETURNED TO SVC. TCASII WAS VERY HELPFUL IN THAT IT DISPLAYED A 'NO TARGET' AREA NE OF ORD WHERE WE COULD GO TO RESOLVE OUR COM PROBLEM.

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.