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A B757 was allowed to climb through an altitude occupied by a CV58 with a stuck microphone. The B757 was being worked by another controller due to the blocked frequency. Loss of separation occurred.
| Attributes | |
| ACN | 415356 |
| Time | |
| Date | 199810 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ind |
| State Reference | IN |
| Altitude | msl bound lower : 19000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | CV 580 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 13 |
| ASRS Report | 415356 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 2 |
| ASRS Report | 415574 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #2 (air carrier Y) was en route at FL200. After check on frequency, this aircraft experienced a stuck microphone. I could tell it was him because he was the only propeller aircraft and we could hear propeller backgnd noise. While trying to get a different frequency, aircraft continued to depart cvg. I told cvg approach to climb aircraft #1 (air carrier X) to FL190. I then asked the next controller to work this aircraft #1 through my sector. Also, aircraft #1 was his control for further climb respect aircraft #2. The other controller apparently dropped the data block of aircraft #2 and climbed aircraft #1 through him. It looked like aircraft #1 leveled a bit (TCASII) at FL197 until clear of aircraft #2. This whole event took place because of a stuck microphone with aircraft #2. When the microphone became unstuck, I told pilot of the incident then switched him to next frequency. The pilot showed up there and had a stuck microphone there, too!
Original NASA ASRS Text
Title: A B757 WAS ALLOWED TO CLB THROUGH AN ALT OCCUPIED BY A CV58 WITH A STUCK MIKE. THE B757 WAS BEING WORKED BY ANOTHER CTLR DUE TO THE BLOCKED FREQ. LOSS OF SEPARATION OCCURRED.
Narrative: ACFT #2 (ACR Y) WAS ENRTE AT FL200. AFTER CHK ON FREQ, THIS ACFT EXPERIENCED A STUCK MIKE. I COULD TELL IT WAS HIM BECAUSE HE WAS THE ONLY PROP ACFT AND WE COULD HEAR PROP BACKGND NOISE. WHILE TRYING TO GET A DIFFERENT FREQ, ACFT CONTINUED TO DEPART CVG. I TOLD CVG APCH TO CLB ACFT #1 (ACR X) TO FL190. I THEN ASKED THE NEXT CTLR TO WORK THIS ACFT #1 THROUGH MY SECTOR. ALSO, ACFT #1 WAS HIS CTL FOR FURTHER CLB RESPECT ACFT #2. THE OTHER CTLR APPARENTLY DROPPED THE DATA BLOCK OF ACFT #2 AND CLBED ACFT #1 THROUGH HIM. IT LOOKED LIKE ACFT #1 LEVELED A BIT (TCASII) AT FL197 UNTIL CLR OF ACFT #2. THIS WHOLE EVENT TOOK PLACE BECAUSE OF A STUCK MIKE WITH ACFT #2. WHEN THE MIKE BECAME UNSTUCK, I TOLD PLT OF THE INCIDENT THEN SWITCHED HIM TO NEXT FREQ. THE PLT SHOWED UP THERE AND HAD A STUCK MIKE THERE, TOO!
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.