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Air carrier light transport given wake turbulence advisory by approach controller on preceding large transport aircraft. Light transport hit wake turbulence and was nearly upset by the encounter.
| Attributes | |
| ACN | 259769 |
| Time | |
| Date | 199312 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pit |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 7800 flight time type : 1100 |
| ASRS Report | 259769 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | inflight encounter other other anomaly |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : regained aircraft control |
| Consequence | Other |
| Miss Distance | horizontal : 18000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Approaching pittz OM at 3000 ft MSL and 180 KTS assigned I was given a wake turbulence warning of an large transport Y 3 mi ahead. Before the controller finished giving the warning my aircraft rolled rapidly into a 60 degree left bank. Aircraft was on autoplt with 15 degrees flaps selected. Autoplt was unable to stop roll, I took control and it still took several seconds to level the wings and get the nose back to the horizon. Altitude loss was 500-700 ft. The scary part was that aircraft did not recover immediately and after I got it recovered, I did not know where other aircraft was and if I would encounter additional wake turbulence. Flew remainder of approach 1 DOT left and encountered minor wake turbulence 2 other times during the approach. ATIS information was XA29Z -X 12 overcast 1 1/2 snow 26/21 2814 altimeter 29.51. Human factors: FAA ATC personnel are aware of the large transport Y wake turbulence problem and that the aircraft should be classified as a heavy aircraft and appropriate separation provided. Warnings/separation must be given in time for corrective action to be taken and controllers must realize that in IMC pilots have few options to avoid wake turbulence.
Original NASA ASRS Text
Title: ACR LTT GIVEN WAKE TURB ADVISORY BY APCH CTLR ON PRECEDING LGT ACFT. LTT HIT WAKE TURB AND WAS NEARLY UPSET BY THE ENCOUNTER.
Narrative: APCHING PITTZ OM AT 3000 FT MSL AND 180 KTS ASSIGNED I WAS GIVEN A WAKE TURB WARNING OF AN LGT Y 3 MI AHEAD. BEFORE THE CTLR FINISHED GIVING THE WARNING MY ACFT ROLLED RAPIDLY INTO A 60 DEG L BANK. ACFT WAS ON AUTOPLT WITH 15 DEGS FLAPS SELECTED. AUTOPLT WAS UNABLE TO STOP ROLL, I TOOK CTL AND IT STILL TOOK SEVERAL SECONDS TO LEVEL THE WINGS AND GET THE NOSE BACK TO THE HORIZON. ALT LOSS WAS 500-700 FT. THE SCARY PART WAS THAT ACFT DID NOT RECOVER IMMEDIATELY AND AFTER I GOT IT RECOVERED, I DID NOT KNOW WHERE OTHER ACFT WAS AND IF I WOULD ENCOUNTER ADDITIONAL WAKE TURB. FLEW REMAINDER OF APCH 1 DOT L AND ENCOUNTERED MINOR WAKE TURB 2 OTHER TIMES DURING THE APCH. ATIS INFO WAS XA29Z -X 12 OVCST 1 1/2 SNOW 26/21 2814 ALTIMETER 29.51. HUMAN FACTORS: FAA ATC PERSONNEL ARE AWARE OF THE LGT Y WAKE TURB PROB AND THAT THE ACFT SHOULD BE CLASSIFIED AS A HVY ACFT AND APPROPRIATE SEPARATION PROVIDED. WARNINGS/SEPARATION MUST BE GIVEN IN TIME FOR CORRECTIVE ACTION TO BE TAKEN AND CTLRS MUST REALIZE THAT IN IMC PLTS HAVE FEW OPTIONS TO AVOID WAKE TURB.
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.