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GA small aircraft pilot deviation excursion from clearance altitude in response to 'tcad' traffic display.
| Attributes | |
| ACN | 199739 |
| Time | |
| Date | 199201 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pns |
| State Reference | FL |
| Altitude | msl bound lower : 6000 msl bound upper : 6700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pns artcc : zdc |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 84 flight time total : 850 flight time type : 400 |
| ASRS Report | 199739 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 4200 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
My tcad suddenly alerted me to a plane 1.5 mi away and 500 ft below me climbing an converging. When the other plane was 300 ft beneath me and less than a mi, I began an abrupt climb. Despite the steepness of the climb, the tcad continued to show the plane 300 ft beneath. It wasn't until 6700 ft MSL that the altitude and distance started diverging. I leveled off and told ATC that I had deviated and was returning to 6000 ft. They commented that they had shown me at 7000 ft at the top of the abrupt climb, but they could not identify what traffic I was avoiding. They said there had been a plane behind me. I said 'that must have been him' although now I am not so sure. I never made visual contact with the plane. The system worked well in this case. As PIC I took corrective action based on advanced equipment in the cockpit. ATC was informed and, in turn, was very cooperative. We'll never know if this was a near miss or 'just one of those things'.
Original NASA ASRS Text
Title: GA SMA PLTDEV EXCURSION FROM CLRNC ALT IN RESPONSE TO 'TCAD' TFC DISPLAY.
Narrative: MY TCAD SUDDENLY ALERTED ME TO A PLANE 1.5 MI AWAY AND 500 FT BELOW ME CLBING AN CONVERGING. WHEN THE OTHER PLANE WAS 300 FT BENEATH ME AND LESS THAN A MI, I BEGAN AN ABRUPT CLB. DESPITE THE STEEPNESS OF THE CLB, THE TCAD CONTINUED TO SHOW THE PLANE 300 FT BENEATH. IT WASN'T UNTIL 6700 FT MSL THAT THE ALT AND DISTANCE STARTED DIVERGING. I LEVELED OFF AND TOLD ATC THAT I HAD DEVIATED AND WAS RETURNING TO 6000 FT. THEY COMMENTED THAT THEY HAD SHOWN ME AT 7000 FT AT THE TOP OF THE ABRUPT CLB, BUT THEY COULD NOT IDENT WHAT TFC I WAS AVOIDING. THEY SAID THERE HAD BEEN A PLANE BEHIND ME. I SAID 'THAT MUST HAVE BEEN HIM' ALTHOUGH NOW I AM NOT SO SURE. I NEVER MADE VISUAL CONTACT WITH THE PLANE. THE SYS WORKED WELL IN THIS CASE. AS PIC I TOOK CORRECTIVE ACTION BASED ON ADVANCED EQUIP IN THE COCKPIT. ATC WAS INFORMED AND, IN TURN, WAS VERY COOPERATIVE. WE'LL NEVER KNOW IF THIS WAS A NEAR MISS OR 'JUST ONE OF THOSE THINGS'.
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.