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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Microphone switch stuck in hot position, disrupted ATC communication due to cockpit conversation broadcast over hot microphone.
| Attributes | |
| ACN | 325688 |
| Time | |
| Date | 199601 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zjx |
| State Reference | FL |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 10000 flight time type : 5000 |
| ASRS Report | 325688 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 60 flight time total : 5700 flight time type : 15 |
| ASRS Report | 325689 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Microphone switch became disabled and stuck in the 'hot' position. This disrupted center frequency for approximately 3 mins. Cockpit conversations were broadcast over frequency for this period of time. Once discovered (due to absence of conversation over the radio) we jiggled yoke switch to unstick it and deselected the captain's microphone selector. Center was upset and we apologized. Alternate audio panel intercom switch was used for the rest of the flight and maintenance in fll was advised of the problem. Dispatcher was also alerted.
Original NASA ASRS Text
Title: MIKE SWITCH STUCK IN HOT POS, DISRUPTED ATC COM DUE TO COCKPIT CONVERSATION BROADCAST OVER HOT MIKE.
Narrative: MIKE SWITCH BECAME DISABLED AND STUCK IN THE 'HOT' POS. THIS DISRUPTED CTR FREQ FOR APPROX 3 MINS. COCKPIT CONVERSATIONS WERE BROADCAST OVER FREQ FOR THIS PERIOD OF TIME. ONCE DISCOVERED (DUE TO ABSENCE OF CONVERSATION OVER THE RADIO) WE JIGGLED YOKE SWITCH TO UNSTICK IT AND DESELECTED THE CAPT'S MIKE SELECTOR. CTR WAS UPSET AND WE APOLOGIZED. ALTERNATE AUDIO PANEL INTERCOM SWITCH WAS USED FOR THE REST OF THE FLT AND MAINT IN FLL WAS ADVISED OF THE PROB. DISPATCHER WAS ALSO ALERTED.
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.