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ARTCC radar controller unable to establish radio contact account of stuck microphone on air carrier medium large transport.
| Attributes | |
| ACN | 268731 |
| Time | |
| Date | 199404 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : crw |
| State Reference | WV |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7000 flight time type : 3000 |
| ASRS Report | 268731 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 80 flight time total : 19000 flight time type : 2000 |
| ASRS Report | 268938 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flying at cruise we noticed that the frequency 132.32 was quiet for a while so we called center. Found out we had a stuck microphone controller had to move other aircraft to another frequency, but said he had no traffic conflict. Later, we checked microphone and it was bad. It would not unkey. We switched mikes to fix problem. Contributing factor: 1/2 of our aircraft have no way to defeat the squelch to listen to speaker when no one is talking. The aircraft had no squelch control switch on other aircraft with squelch I always check when frequency is not busy. Supplemental information from acn 268938: 1 contributing factor was we had no squelch mode on our radios to check for open frequencys.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR UNABLE TO ESTABLISH RADIO CONTACT ACCOUNT OF STUCK MIKE ON ACR MLG.
Narrative: FLYING AT CRUISE WE NOTICED THAT THE FREQ 132.32 WAS QUIET FOR A WHILE SO WE CALLED CTR. FOUND OUT WE HAD A STUCK MIKE CTLR HAD TO MOVE OTHER ACFT TO ANOTHER FREQ, BUT SAID HE HAD NO TFC CONFLICT. LATER, WE CHKED MIKE AND IT WAS BAD. IT WOULD NOT UNKEY. WE SWITCHED MIKES TO FIX PROB. CONTRIBUTING FACTOR: 1/2 OF OUR ACFT HAVE NO WAY TO DEFEAT THE SQUELCH TO LISTEN TO SPEAKER WHEN NO ONE IS TALKING. THE ACFT HAD NO SQUELCH CTL SWITCH ON OTHER ACFT WITH SQUELCH I ALWAYS CHK WHEN FREQ IS NOT BUSY. SUPPLEMENTAL INFO FROM ACN 268938: 1 CONTRIBUTING FACTOR WAS WE HAD NO SQUELCH MODE ON OUR RADIOS TO CHK FOR OPEN FREQS.
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.