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Temporary loss of aircraft control in a C152 when in proximity of rotary winged traffic.
| Attributes | |
| ACN | 349307 |
| Time | |
| Date | 199610 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sna |
| State Reference | CA |
| Altitude | agl bound lower : 50 agl bound upper : 50 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sna |
| Operator | general aviation : instructional |
| Make Model Name | Cessna 152 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : takeoff |
| Flight Plan | None |
| Aircraft 2 | |
| Make Model Name | Jet Ranger Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | ground other : taxi other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor oversight : pic |
| Qualification | pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 45 flight time total : 630 flight time type : 100 |
| ASRS Report | 349307 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot instruction : trainee |
| Qualification | pilot : student |
| Events | |
| Anomaly | inflight encounter other other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : exited adverse environment flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
I was flying with a student in left closed traffic to runway 19L. Several other airplanes were in the pattern, as well as a B206 helicopter. My airplane student is a high-time B206 pilot and we both observed and agreed that the B206 was having a tough time with their control on their approachs. The B206 was full-stopping to a hover over the numbers on runway 19L on several circuits and was taking quite a long time to takeoff after each approach and was slowing down the traffic pattern and I believe that several airplanes had to go around because the B206 hadn't cleared the runway. On one of our full-stop taxi backs we observed the B206 takeoff down runway 19L after requesting an 'air taxi' to the compass rose at the end of runway 19L. The helicopter flew at about 100 ft AGL. Then we were cleared into position and hold on runway 19L and right away for takeoff for left closed traffic. Tower advised us to maintain visual separation on the helicopter ahead but did not advise us about rotor-wake turbulence. As we took off in our C152, at about 50 ft AGL we experienced a 25 degree uncommanded right roll near the end of runway 19L where the helicopter had just been. I took the controls and neutralized the danger, we continued our pattern. A couple of circuits later the helicopter was back in the pattern with us and at one point tower called the helicopter to scold them about messing up the pattern. The helicopter then requested an air taxi to the southeast pads and was cleared for that request. Tower then cleared us to takeoff again behind the helicopter. I told my student to hold in position and requested a delay for 'rotor turbulence avoidance.' it then became obvious that tower was unaware of the danger. On the circuits when the helicopter flew a normal pattern we didn't end up in proximity to the wakes. The danger seemed to he related to the long low level air taxis.
Original NASA ASRS Text
Title: TEMPORARY LOSS OF ACFT CTL IN A C152 WHEN IN PROX OF ROTARY WINGED TFC.
Narrative: I WAS FLYING WITH A STUDENT IN L CLOSED TFC TO RWY 19L. SEVERAL OTHER AIRPLANES WERE IN THE PATTERN, AS WELL AS A B206 HELI. MY AIRPLANE STUDENT IS A HIGH-TIME B206 PLT AND WE BOTH OBSERVED AND AGREED THAT THE B206 WAS HAVING A TOUGH TIME WITH THEIR CTL ON THEIR APCHS. THE B206 WAS FULL-STOPPING TO A HOVER OVER THE NUMBERS ON RWY 19L ON SEVERAL CIRCUITS AND WAS TAKING QUITE A LONG TIME TO TKOF AFTER EACH APCH AND WAS SLOWING DOWN THE TFC PATTERN AND I BELIEVE THAT SEVERAL AIRPLANES HAD TO GAR BECAUSE THE B206 HADN'T CLRED THE RWY. ON ONE OF OUR FULL-STOP TAXI BACKS WE OBSERVED THE B206 TKOF DOWN RWY 19L AFTER REQUESTING AN 'AIR TAXI' TO THE COMPASS ROSE AT THE END OF RWY 19L. THE HELI FLEW AT ABOUT 100 FT AGL. THEN WE WERE CLRED INTO POS AND HOLD ON RWY 19L AND RIGHT AWAY FOR TKOF FOR L CLOSED TFC. TWR ADVISED US TO MAINTAIN VISUAL SEPARATION ON THE HELI AHEAD BUT DID NOT ADVISE US ABOUT ROTOR-WAKE TURB. AS WE TOOK OFF IN OUR C152, AT ABOUT 50 FT AGL WE EXPERIENCED A 25 DEG UNCOMMANDED R ROLL NEAR THE END OF RWY 19L WHERE THE HELI HAD JUST BEEN. I TOOK THE CTLS AND NEUTRALIZED THE DANGER, WE CONTINUED OUR PATTERN. A COUPLE OF CIRCUITS LATER THE HELI WAS BACK IN THE PATTERN WITH US AND AT ONE POINT TWR CALLED THE HELI TO SCOLD THEM ABOUT MESSING UP THE PATTERN. THE HELI THEN REQUESTED AN AIR TAXI TO THE SE PADS AND WAS CLRED FOR THAT REQUEST. TWR THEN CLRED US TO TKOF AGAIN BEHIND THE HELI. I TOLD MY STUDENT TO HOLD IN POS AND REQUESTED A DELAY FOR 'ROTOR TURB AVOIDANCE.' IT THEN BECAME OBVIOUS THAT TWR WAS UNAWARE OF THE DANGER. ON THE CIRCUITS WHEN THE HELI FLEW A NORMAL PATTERN WE DIDN'T END UP IN PROX TO THE WAKES. THE DANGER SEEMED TO HE RELATED TO THE LONG LOW LEVEL AIR TAXIS.
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.