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A B777-200 experienced a stuck microphone affecting all radios while on approach. ACARS was used through air carrier dispatch for ATC communication.
| Attributes | |
| ACN | 758457 |
| Time | |
| Date | 200710 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 27000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc tower : zzz.tower |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 250 flight time total : 20000 flight time type : 3200 |
| ASRS Report | 758437 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Flight cleared to abc; XXX arrival into ZZZ. Received descent clearance; tried to acknowledge; but stuck microphone on frequency. Realized it may be us; confirmed with EICAS message 'radio transmit.' unable to transmit from any captain location; ie hand held; yoke switch; panel switch; tried all with no success; also changed radios cycling through #1; #2; and #3 VHF. Changed frequencys to approach. Nothing worked. First officer tried all 3 radios with various switches his side. Finally cleared when I turned all microphone switches off on #1 console; but still unable to transmit. By this time we decided to squawk 7600 and fly the approach. I ACARS'ed dispatch who was in contact with ATC. We confirmed ILS xx through dispatch/ZZZ tower and landed runway xx without incident.
Original NASA ASRS Text
Title: A B777-200 EXPERIENCED A STUCK MICROPHONE AFFECTING ALL RADIOS WHILE ON APCH. ACARS WAS USED THROUGH ACR DISPATCH FOR ATC COM.
Narrative: FLT CLRED TO ABC; XXX ARR INTO ZZZ. RECEIVED DSCNT CLRNC; TRIED TO ACKNOWLEDGE; BUT STUCK MIKE ON FREQ. REALIZED IT MAY BE US; CONFIRMED WITH EICAS MESSAGE 'RADIO XMIT.' UNABLE TO XMIT FROM ANY CAPT LOCATION; IE HAND HELD; YOKE SWITCH; PANEL SWITCH; TRIED ALL WITH NO SUCCESS; ALSO CHANGED RADIOS CYCLING THROUGH #1; #2; AND #3 VHF. CHANGED FREQS TO APCH. NOTHING WORKED. FO TRIED ALL 3 RADIOS WITH VARIOUS SWITCHES HIS SIDE. FINALLY CLRED WHEN I TURNED ALL MIKE SWITCHES OFF ON #1 CONSOLE; BUT STILL UNABLE TO XMIT. BY THIS TIME WE DECIDED TO SQUAWK 7600 AND FLY THE APCH. I ACARS'ED DISPATCH WHO WAS IN CONTACT WITH ATC. WE CONFIRMED ILS XX THROUGH DISPATCH/ZZZ TWR AND LANDED RWY XX WITHOUT INCIDENT.
Data retrieved from NASA's ASRS site as of January 2009 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.