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Close proximity between IFR air carrier and VFR GA twin. See and avoid situation with ATC involvement.
| Attributes | |
| ACN | 101165 |
| Time | |
| Date | 198811 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sli |
| State Reference | CA |
| Altitude | msl bound lower : 14500 msl bound upper : 14500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 101165 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : far other anomaly other |
| Independent Detector | other flight crewa other other : unspecified atc |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Air carrier X was climbing to 15000' en route to san. GA twin Y was VFR, en route to sjc. I was at sector 22 and called traffic to aircraft Y who was on my frequency. The pilot reported that he had him in sight. The sector 21 controller attempted to call traffic to air carrier X when the aircraft were 10 miles apart, but he had just lost his radios. (Sector 21 is adjacent to sector 22). Due to this frequency problem, the pilot of air carrier X never heard the traffic call. When he came up on my frequency, he asked if an aircraft had passed close to his. I informed him that it indeed had, but that the controller had tried to call traffic to him. The 2 aircraft had no target resolution and appeared to pass at same altitude which was 14500'. The pilot of air carrier X appeared angry, and then asked what altitude the other aircraft was at. I informed him and also told him that aircraft Y had him in sight.
Original NASA ASRS Text
Title: CLOSE PROX BETWEEN IFR ACR AND VFR GA TWIN. SEE AND AVOID SITUATION WITH ATC INVOLVEMENT.
Narrative: ACR X WAS CLBING TO 15000' ENRTE TO SAN. GA TWIN Y WAS VFR, ENRTE TO SJC. I WAS AT SECTOR 22 AND CALLED TFC TO ACFT Y WHO WAS ON MY FREQ. THE PLT RPTED THAT HE HAD HIM IN SIGHT. THE SECTOR 21 CTLR ATTEMPTED TO CALL TFC TO ACR X WHEN THE ACFT WERE 10 MILES APART, BUT HE HAD JUST LOST HIS RADIOS. (SECTOR 21 IS ADJACENT TO SECTOR 22). DUE TO THIS FREQ PROBLEM, THE PLT OF ACR X NEVER HEARD THE TFC CALL. WHEN HE CAME UP ON MY FREQ, HE ASKED IF AN ACFT HAD PASSED CLOSE TO HIS. I INFORMED HIM THAT IT INDEED HAD, BUT THAT THE CTLR HAD TRIED TO CALL TFC TO HIM. THE 2 ACFT HAD NO TARGET RESOLUTION AND APPEARED TO PASS AT SAME ALT WHICH WAS 14500'. THE PLT OF ACR X APPEARED ANGRY, AND THEN ASKED WHAT ALT THE OTHER ACFT WAS AT. I INFORMED HIM AND ALSO TOLD HIM THAT ACFT Y HAD HIM IN SIGHT.
Data retrieved from NASA's ASRS site as of August 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.