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servicing my airplanes at the FBO for the last 8 years. As we approached the turn
from downwind to base for Runway XX, the State Police helicopter entered a right
base for Runway XX. We acknowledged the State Police call, on the CTAF, and
extended our downwind for traffic separation. As we turned from base to final, I
could see the State Police helicopter crossing over the threshold for Runway XX,
then side-stepped to Taxiway A, past the intersection for Taxiway D. As we crossed
over the threshold for Runway XX about 50 FT in altitude, with the State Police
helicopter still over Taxiway A, we flew into the helicopter's rotor wash. Our aircraft
initially experienced a drop in altitude that required power to be added in order to
maintain a proper attitude, then the aircraft rolled right (approximately 30 degree
bank attitude), then left, then violently to the right (with a bank greater than 60
degrees). I recovered the aircraft and executed a go-around, at which point I
noticed the helicopter was either hovering over Taxiway A, or departing from the
taxiway (the helicopter pilot did not make a call on CTAF of his intentions, so I am
not sure what part of flight was being conducted at this time). Someone then made
a cautionary announcement, on CTAF, to the traffic behind us that a PA28 had just
flipped 90 degrees but recovered. When we came back around, we noticed the
helicopter had moved from this location.
Synopsis
PA28 encountered rotor wash from a helicopter that had preceded them on the
landing approach. Momentary loss of control necessitated a go-around.
ACN: 832524 (27 of 50)
Time / Day
Date : 200904
Local Time Of Day : 0601-1200
Place
Locale Reference.Airport : ZZZ.Airport
State Reference : US
Altitude.MSL.Single Value : 40000
Environment
Flight Conditions : VMC
Light : Daylight
Aircraft
Reference : Z
ATC / Advisory.Center : ZZZ.ARTCC
Aircraft Operator : Corporate
Make Model Name : Challenger CL601
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 91
Flight Plan : IFR
Mission : Passenger
Flight Phase : Cruise
Airspace.Class A : ZZZ.A
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Corporate
Function.Flight Crew : Pilot Flying
Function.Flight Crew : Captain
Qualification.Flight Crew : Air Transport Pilot (ATP)
Qualification.Flight Crew : Flight Engineer
Qualification.Flight Crew : Flight Instructor
Experience.Flight Crew.Total : 14000
Experience.Flight Crew.Last 90 Days : 150
Experience.Flight Crew.Type : 3000
ASRS Report Number.Accession Number : 832524
Events
Anomaly.Deviation - Altitude : Excursion From Assigned Altitude
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
Assessments
Contributing Factors / Situations : Environment - Non Weather Related
Primary Problem : Environment - Non Weather Related
Narrative: 1
While at FL400 in trail behind a B737 in relatively smooth air we encountered wake
turbulence. First roll was to the right with approximately 60 degrees of bank which
disengaged the autopilot, mach trim and yaw damper. As the bank increased the
nose lowered 5 degrees. I had on passenger in the galley, and she made it back to
her seat (no injury) so I had to be gentle in rolling back to level and raising the
nose. I had the Second in Command contact Center and he told them of the wake
turbulence and the altitude deviation (we lost 500 FT). Center told us to descend
maintain FL380. As I leveled the wings we encountered more wake turbulence and
we rolled 65 degrees to the left and the nose pitched down 6 degrees as I was
trying to hand fly the aircraft without autopilot, yaw damper, or mach trim. I was
then able to level wings and we descended to FL380. I was able to engage the
autopilot, mach trim, and yaw damper (right AFCS system). We checked with the
passengers and for any injuries (none) and any aircraft damage (none). I reengaged
the left AFCS system and we continued to ZZZ1 without any other
problems. We asked Center what our distance was behind the B737, it was 10.2
miles. We were indicating mach .79 at FL400 (we were assigned .80 or less). From
now on I will take any size aircraft into consideration in regards to wake turbulence.
Synopsis
A CL601 Captain reported wake turbulence from a B737 caused him to deviate 500
FT from assigned altitude of FL400 and the aircraft rolled as much as 65 degrees.
ACN: 827369 (28 of 50)
Time / Day
Date : 200903
Local Time Of Day : 1201-1800
Place
Locale Reference.Airport : ZZZ.Airport
　
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