Air carrier lost communication on final approach to sna, ca. After troubleshooting problem flight crew was not prepared to land so executed a go around.

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Attributes
ACN	466676
Time
Date	200003
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sna.airport
State Reference	CA
Altitude	msl single value : 1500
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon tower : sna.tower
Operator	common carrier : air carrier
Make Model Name	MD-90 Series (DC-9-90) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	466676
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	466674
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : executed go around flight crew : overcame equipment problem
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

Upon switching from approach to tower frequency, lost communication -- suspected stuck microphone. Banged on cockpit microphone, reset headset, switched radios, switched back to approach -- all to no avail. Spent too long troubleshooting radio. Found myself at 500 ft on short final without landing checklist complete. High and fast at sna, decided to go around just as tower gave us the green light. Upon safe climb out, found hand microphone stuck in clip. When unstuck, lost communication condition cleared and contacted tower and approach for return to sna. In retrospect, I spent too long trying to establish communication. Had I completed checklist and looked for green light, we could have landed successfully and cleared microphone problem on ground.

Original NASA ASRS Text

Title: ACR LOST COM ON FINAL APCH TO SNA, CA. AFTER TROUBLESHOOTING PROB FLC WAS NOT PREPARED TO LAND SO EXECUTED A GAR.

Narrative: UPON SWITCHING FROM APCH TO TWR FREQ, LOST COM -- SUSPECTED STUCK MIKE. BANGED ON COCKPIT MIKE, RESET HEADSET, SWITCHED RADIOS, SWITCHED BACK TO APCH -- ALL TO NO AVAIL. SPENT TOO LONG TROUBLESHOOTING RADIO. FOUND MYSELF AT 500 FT ON SHORT FINAL WITHOUT LNDG CHKLIST COMPLETE. HIGH AND FAST AT SNA, DECIDED TO GO AROUND JUST AS TWR GAVE US THE GREEN LIGHT. UPON SAFE CLBOUT, FOUND HAND MIKE STUCK IN CLIP. WHEN UNSTUCK, LOST COM CONDITION CLRED AND CONTACTED TWR AND APCH FOR RETURN TO SNA. IN RETROSPECT, I SPENT TOO LONG TRYING TO ESTABLISH COM. HAD I COMPLETED CHKLIST AND LOOKED FOR GREEN LIGHT, WE COULD HAVE LANDED SUCCESSFULLY AND CLRED MIKE PROB ON GND.

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.