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EMS helicopter pilot reporter encounters 2 sharp jarring impacts from wake vortices flying under the final approach path of a major international airport.
| Attributes | |
| ACN | 317280 |
| Time | |
| Date | 199509 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | msl bound lower : 1600 msl bound upper : 1600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz |
| Operator | common carrier : air taxi |
| Make Model Name | BO105 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 30 flight time total : 5000 flight time type : 800 |
| ASRS Report | 317280 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | inflight encounter other other anomaly other |
| Independent Detector | other other : unspecified cockpit |
| Resolutory Action | flight crew : exited adverse environment |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Return leg from an accident scene to base hospital. Route runs from west to east, under incoming traffic landing to the south at airport X. I encountered wake turbulence at approximately 1600 ft MSL, 5 mi north of airport. 2 distinct and jarring encounters of turbulence were felt. Traffic was heavy at airport. Many heavy aircraft were landing. Traffic was approximately 1000 ft above me. Callback conversation with reporter revealed the following information: the reporter stated he was flying a messerschmitt bolkow helicopter. The route under the ILS has been flown by him for the past 3 yrs perhaps 10 times a month and never before has he experienced a wake problem. The tower is aware of the EMS route under their ILS final approach. He said these vortex generated impacts did alarm him regarding structural stresses. No one was hurt in the helicopter and he plans to continue flying the route as he has been doing without incident for the past 3 yrs and approximately 10 times per month or 360 times.
Original NASA ASRS Text
Title: EMS HELI PLT RPTR ENCOUNTERS 2 SHARP JARRING IMPACTS FROM WAKE VORTICES FLYING UNDER THE FINAL APCH PATH OF A MAJOR INTL ARPT.
Narrative: RETURN LEG FROM AN ACCIDENT SCENE TO BASE HOSPITAL. RTE RUNS FROM W TO E, UNDER INCOMING TFC LNDG TO THE S AT ARPT X. I ENCOUNTERED WAKE TURB AT APPROX 1600 FT MSL, 5 MI N OF ARPT. 2 DISTINCT AND JARRING ENCOUNTERS OF TURB WERE FELT. TFC WAS HVY AT ARPT. MANY HVY ACFT WERE LNDG. TFC WAS APPROX 1000 FT ABOVE ME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS FLYING A MESSERSCHMITT BOLKOW HELI. THE RTE UNDER THE ILS HAS BEEN FLOWN BY HIM FOR THE PAST 3 YRS PERHAPS 10 TIMES A MONTH AND NEVER BEFORE HAS HE EXPERIENCED A WAKE PROB. THE TWR IS AWARE OF THE EMS RTE UNDER THEIR ILS FINAL APCH. HE SAID THESE VORTEX GENERATED IMPACTS DID ALARM HIM REGARDING STRUCTURAL STRESSES. NO ONE WAS HURT IN THE HELI AND HE PLANS TO CONTINUE FLYING THE RTE AS HE HAS BEEN DOING WITHOUT INCIDENT FOR THE PAST 3 YRS AND APPROX 10 TIMES PER MONTH OR 360 TIMES.
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.