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GA-small aircraft encountered wake turbulence from an air carrier-large transport. Small aircraft landed as large transport was clearing the runway.
| Attributes | |
| ACN | 90749 |
| Time | |
| Date | 198807 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : phx |
| State Reference | AZ |
| Altitude | agl bound lower : 0 agl bound upper : 150 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : phx |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | descent : approach landing other |
| Route In Use | approach : visual |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | observation : passenger |
| Qualification | pilot : commercial |
| Experience | flight time total : 2000 |
| ASRS Report | 90749 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time total : 10000 |
| Events | |
| Anomaly | inflight encounter other other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : exited adverse environment flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Aircraft was cleared for left downwind, #3 behind an air carrier large transport on long final. Started turn as the large transport crossed abeam about 1-1 1/2 mi from threshold and stayed high intentionally in keeping with knowledge and earlier discussion of wake turbulence hazard. Tower gave routine 'caution, wake turbulence' advisory as part of the clearance to land--given while on base. Saw large transport T/D slightly long, perhaps at 1500-2000'--nothing really out of the ordinary. VASI showed us to be on G/south until less than about 150' AGL when aircraft began to sink markedly, followed by slight right wing drop, followed immediately by a rapid left wing down to at least 30-40 degrees. Pilot regained latitude control quickly coincident with a large advance in power. Pilot called the tower advising them of the vortex encounter and the observed fact that the large transport was just clearing the runway when we encountered his wake.
Original NASA ASRS Text
Title: GA-SMA ENCOUNTERED WAKE TURBULENCE FROM AN ACR-LGT. SMA LANDED AS LGT WAS CLEARING THE RWY.
Narrative: ACFT WAS CLRED FOR LEFT DOWNWIND, #3 BEHIND AN ACR LGT ON LONG FINAL. STARTED TURN AS THE LGT CROSSED ABEAM ABOUT 1-1 1/2 MI FROM THRESHOLD AND STAYED HIGH INTENTIONALLY IN KEEPING WITH KNOWLEDGE AND EARLIER DISCUSSION OF WAKE TURB HAZARD. TWR GAVE ROUTINE 'CAUTION, WAKE TURB' ADVISORY AS PART OF THE CLRNC TO LAND--GIVEN WHILE ON BASE. SAW LGT T/D slightly LONG, PERHAPS AT 1500-2000'--NOTHING REALLY OUT OF THE ORDINARY. VASI SHOWED US TO BE ON G/S UNTIL LESS THAN ABOUT 150' AGL WHEN ACFT BEGAN TO SINK MARKEDLY, FOLLOWED BY SLIGHT RIGHT WING DROP, FOLLOWED IMMEDIATELY BY A RAPID LEFT WING DOWN TO AT LEAST 30-40 DEGS. PLT REGAINED LAT CTL QUICKLY COINCIDENT WITH A LARGE ADVANCE IN PWR. PLT CALLED THE TWR ADVISING THEM OF THE VORTEX ENCOUNTER AND THE OBSERVED FACT THAT THE LGT WAS JUST CLRING THE RWY WHEN WE ENCOUNTERED HIS WAKE.
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.