A light aircraft in the traffic pattern at bfi experienced a near midair collision with another airc...

Attributes
ACN	792464
Time
Date	200806
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bfi.airport
State Reference	WA
Altitude	agl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bfi.tower
Operator	general aviation : personal
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tower : bfi.tower
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : student
Experience	flight time last 90 days : 6 flight time total : 45 flight time type : 24
ASRS Report	792464
Person 2
Affiliation	other
Function	instruction : instructor
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 200 vertical : 150
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

During closed pattern training (touch-and-go) at bfi; my aircraft would have collided with another inbound aircraft had evasive action not been taken. I was in transition from crosswind turn after takeoff just starting to level wings before turning downwind when my CFI took sudden and immediate evasive action to avoid collision with another aircraft entering the pattern inbound from an unknown origin. I believe a midair collision would have occurred if evasive action had not been taken. The inbound aircraft came way too close. This very close call could have been avoided if ATC had advised me to extend my upwind and advised of the traffic. I believe I am alive today only because of the exceptional situational awareness of my CFI.

Original NASA ASRS Text

Title: A LIGHT AIRCRAFT IN THE TRAFFIC PATTERN AT BFI EXPERIENCED A NMAC WITH ANOTHER AIRCRAFT.

Narrative: DURING CLOSED PATTERN TRAINING (TOUCH-AND-GO) AT BFI; MY ACFT WOULD HAVE COLLIDED WITH ANOTHER INBOUND ACFT HAD EVASIVE ACTION NOT BEEN TAKEN. I WAS IN TRANSITION FROM XWIND TURN AFTER TKOF JUST STARTING TO LEVEL WINGS BEFORE TURNING DOWNWIND WHEN MY CFI TOOK SUDDEN AND IMMEDIATE EVASIVE ACTION TO AVOID COLLISION WITH ANOTHER ACFT ENTERING THE PATTERN INBOUND FROM AN UNKNOWN ORIGIN. I BELIEVE A MIDAIR COLLISION WOULD HAVE OCCURRED IF EVASIVE ACTION HAD NOT BEEN TAKEN. THE INBOUND ACFT CAME WAY TOO CLOSE. THIS VERY CLOSE CALL COULD HAVE BEEN AVOIDED IF ATC HAD ADVISED ME TO EXTEND MY UPWIND AND ADVISED OF THE TFC. I BELIEVE I AM ALIVE TODAY ONLY BECAUSE OF THE EXCEPTIONAL SITUATIONAL AWARENESS OF MY CFI.

Data retrieved from NASA's ASRS site as of May 2009 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.

A light aircraft in the traffic pattern at bfi experienced a near midair collision with another aircraft.