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Pilot and instructor in small aircraft single had near midair collision with small aircraft twin at 9500 MSL over lake tahoe.
| Attributes | |
| ACN | 187087 |
| Time | |
| Date | 199108 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : swr airport : tvl |
| State Reference | CA |
| Altitude | msl bound lower : 9500 msl bound upper : 9500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : instructional |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Fixed Gear |
| Flight Phase | descent other |
| Flight Plan | None |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Small Aircraft, Low Wing, 2 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor oversight : pic |
| Qualification | pilot : cfi |
| Experience | flight time last 90 days : 100 flight time total : 1700 flight time type : 500 |
| ASRS Report | 187087 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot instruction : trainee |
| Qualification | pilot : private |
| Events | |
| Anomaly | conflict : nmac other anomaly other |
| Independent Detector | other other : unspecified cockpit |
| Resolutory Action | flight crew : took evasive action none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 100 vertical : 10 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On a training flight for a high density altitude chkout from O56 (gnoss field) to tvl and trk we had been cruising at 9500 ft (sac altimeter 29.93 approximately) with flight following from ZOA. We had just received the tvl WX from flight watch and reset the altimeter to tvl 30.31 approximately and returned to ZOA. They then terminated our radar service as we were approaching echo summit and directed us to tvl tower. We were starting descent out of 9800 ft (due to altimeter change) and were talking to the tower when the private PF made an abrupt right turn approximately 40 degree bank and 40 degree heading change. I had been checking some information in the AFD and looked up to see a light twin out the left side of the plane in level flight at 9500 ft on heading exactly opposite what ours had been (we had been heading O46) separation was less than 10 ft vertical and less than 100 horizontal. I don't think the other pilot ever saw us as he didn't seem to take any evasive action. Since he was within 3000 ft AGL technically he wasn't at an improper altitude for his direction of flight. He may have been over the lake and come around the mountains to the north of our position or he may have blended in with clouds northeast of our position +/- 15 NM (his plane was white). Cloud bases approximately 9000 MSL estimated. Center never reported any traffic in the area but they may not have seen him in the tahoe basin.
Original NASA ASRS Text
Title: PLT AND INSTRUCTOR IN SMA SINGLE HAD NMAC WITH SMA TWIN AT 9500 MSL OVER LAKE TAHOE.
Narrative: ON A TRAINING FLT FOR A HIGH DENSITY ALT CHKOUT FROM O56 (GNOSS FIELD) TO TVL AND TRK WE HAD BEEN CRUISING AT 9500 FT (SAC ALTIMETER 29.93 APPROX) WITH FLT FOLLOWING FROM ZOA. WE HAD JUST RECEIVED THE TVL WX FROM FLT WATCH AND RESET THE ALTIMETER TO TVL 30.31 APPROX AND RETURNED TO ZOA. THEY THEN TERMINATED OUR RADAR SVC AS WE WERE APCHING ECHO SUMMIT AND DIRECTED US TO TVL TWR. WE WERE STARTING DSCNT OUT OF 9800 FT (DUE TO ALTIMETER CHANGE) AND WERE TALKING TO THE TWR WHEN THE PRIVATE PF MADE AN ABRUPT R TURN APPROX 40 DEG BANK AND 40 DEG HDG CHANGE. I HAD BEEN CHKING SOME INFO IN THE AFD AND LOOKED UP TO SEE A LIGHT TWIN OUT THE L SIDE OF THE PLANE IN LEVEL FLT AT 9500 FT ON HDG EXACTLY OPPOSITE WHAT OURS HAD BEEN (WE HAD BEEN HDG O46) SEPARATION WAS LESS THAN 10 FT VERT AND LESS THAN 100 HORIZ. I DON'T THINK THE OTHER PLT EVER SAW US AS HE DIDN'T SEEM TO TAKE ANY EVASIVE ACTION. SINCE HE WAS WITHIN 3000 FT AGL TECHNICALLY HE WASN'T AT AN IMPROPER ALT FOR HIS DIRECTION OF FLT. HE MAY HAVE BEEN OVER THE LAKE AND COME AROUND THE MOUNTAINS TO THE N OF OUR POS OR HE MAY HAVE BLENDED IN WITH CLOUDS NE OF OUR POS +/- 15 NM (HIS PLANE WAS WHITE). CLOUD BASES APPROX 9000 MSL ESTIMATED. CENTER NEVER RPTED ANY TFC IN THE AREA BUT THEY MAY NOT HAVE SEEN HIM IN THE TAHOE BASIN.
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.