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Detector.Person : Flight Crew
Result.Flight Crew : Regained Aircraft Control
Assessments
Contributing Factors / Situations : Environment - Non Weather Related
Contributing Factors / Situations : Airspace Structure
Primary Problem : Environment - Non Weather Related
Narrative: 1
FOLLOWING AN AIRBUS ON A VISUAL 3 MI BEHIND. ENCOUNTERED WAKE AND
ROLLED MORE THAN 45 DEGS. DISCONNECTED AUTOPLT AND USED FULL
CONTROL AUTHORITY TO LEVEL THE WINGS. SLOWED TO INCREASE SPACING. WE
ASKED WHAT KIND OF AIRBUS AND WAS TOLD AN A321. SPACING WAS GOOD.
HE WAS AT 4000 FT AND PASSED THROUGH OUR ALTITUDE 3 MILES AHEAD IN
FAIRLY CALM CONDITIONS. WE DO NOT KNOW HOW HEAVY HE WAS, BUT MAYBE
MORE SPACING BEHIND A321 WOULD BE BETTER.
Synopsis
PASSING THROUGH THE WAKE OF AN A321 CAUSED MORE THAN 45 DEGS OF
ROLL THAT REQUIRED THE USE OF FULL CONTROL AUTHORITY BY A B737 CREW
DURING RECOVERY.
ACN: 813085 (41 of 50)
Time / Day
Date : 200811
Local Time Of Day : 1201-1800
Place
Locale Reference.Airport : ZZZ.Airport
State Reference : US
Altitude.AGL.Single Value : 25
Environment
Flight Conditions : VMC
Weather Elements / Visibility.Visibility : 10
Light : Daylight
Aircraft
Reference : X
ATC / Advisory.Tower : ZZZ.Tower
Aircraft Operator : Air Carrier
Make Model Name : EMB ERJ 135 ER&LR
Crew Size.Number Of Crew : 2
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Initial Approach
Flight Phase : Landing
Airspace.Class C : ZZZ.C
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : Pilot Flying
Function.Flight Crew : Captain
Qualification.Flight Crew : Flight Engineer
Qualification.Flight Crew : Air Transport Pilot (ATP)
Experience.Flight Crew.Total : 8265
Experience.Flight Crew.Last 90 Days : 214
Experience.Flight Crew.Type : 6920
ASRS Report Number.Accession Number : 813085
Events
Anomaly.Inflight Event / Encounter : Wake Vortex Encounter
Detector.Person : Flight Crew
Result.General : None Reported / Taken
Assessments
Contributing Factors / Situations : Human Factors
Contributing Factors / Situations : Airport
Primary Problem : Human Factors
Narrative: 1
WE WERE CLRED FOR THE VISUAL APCH. WHEN WE WERE ON A 2 MI FINAL, TWR
TOLD US THAT A HELI WAS XING THE RWY AT ABOUT 1000 FT FROM THE
THRESHOLD. WE COULD SEE A BLACKHAWK HELI AT ABOUT 100 FT AGL CROSS
THE RWY OVER THE 1000 FT RWY AIMING POINT MARKING. NEITHER ME NOR MY
FO GAVE THE HELI A SECOND THOUGHT. AS WE CROSSED THE RWY THRESHOLD
AND PRIOR TO THE 1000 FT FIXED DISTANCE MARKER, THE AIRPLANE SUDDENLY
DROPPED AND WE SLAMMED ONTO THE RWY. UP UNTIL THAT POINT WE WERE ON
A STABILIZED APCH. I HAD NOT MADE ANY CONFIGN, PITCH, OR THRUST
CHANGES UP TO THAT POINT. OUR AIRSPD WAS CONSTANT WITH A STEADY
WIND THAT WAS RIGHT DOWN THE RWY AT ABOUT 15 KTS. I THEN REALIZED
THAT WE HAD HIT THE WAKE OF THE BLACKHAWK HELI. I HAVE NEVER
EXPERIENCED WAKE FROM A HELI BEFORE AND THIS CAUGHT ME COMPLETELY
OFF GUARD. IT HAPPENED SO FAST I WAS NOT ABLE TO REACT IN TIME TO
PREVENT THE ACFT FROM SLAMMING ONTO THE RWY. TO PREVENT THIS FROM
HAPPENING IN THE FUTURE, ATC SHOULD NOT BE PERMITTED TO CROSS HELIS
AT LOW ALTS OVER THE TOUCHDOWN ZONE OF THE LNDG RWY.
Synopsis
EMB135 FLIGHT CREW EXPERIENCES A HARD LANDING AFTER ENCOUNTERING
UNFORESEEN BLACKHAWK HELICOPTER'S WAKE TURBULENCE.
ACN: 812623 (42 of 50)
Time / Day
Date : 200811
Local Time Of Day : 1801-2400
Place
Locale Reference.Airport : VHHH.Airport
State Reference : FO
Altitude.AGL.Single Value : 800
Environment
Ceiling : CLR
Aircraft : 1
Reference : X
ATC / Advisory.Tower : VHHH.Tower
Aircraft Operator : Air Carrier
Make Model Name : B747-400
Crew Size.Number Of Crew : 4
Operating Under FAR Part : Part 121
Flight Plan : IFR
Mission : Passenger
Flight Phase : Initial Climb
Aircraft : 2
Reference : Y
Aircraft Operator : Air Carrier
Make Model Name : B777 Undifferentiated or Other Model
Operating Under FAR Part : Part 129
Flight Plan : IFR
Mission : Passenger
Flight Phase : Initial Climb
Person
Reference : 1
Location Of Person.Aircraft : X
Reporter Organization : Air Carrier
Function.Flight Crew : Pilot Not Flying
Function.Flight Crew : Captain
Experience.Flight Crew.Total : 16000
Experience.Flight Crew.Last 90 Days : 240
Experience.Flight Crew.Type : 2500
ASRS Report Number.Accession Number : 812623
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