A BE35 pilot departing bfi was cleared to turn crosswind after passing traffic on downwind; but he turned early and had an near midair collision with the other aircraft.

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Attributes
ACN	709173
Time
Date	200609
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bfi.airport
State Reference	WA
Altitude	msl single value : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bfi.tower
Operator	general aviation : personal
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : bfi.tower
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Person 1
Affiliation	other
Function	flight crew : single pilot oversight : pic
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 15 flight time total : 850 flight time type : 700
ASRS Report	709173
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	conflict : nmac non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 400 vertical : 250
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

My ATC takeoff clearance was to depart runway 31L and to turn crosswind after passing traffic in the downwind. I did not see the traffic from the ground and proceeded to take off. At the standard 500 ft altitude on the upwind; I started a left crosswind turn. About 1/2 way through the turn I saw the conflicting traffic coming at me in the downwind. I climbed and cleared the traffic approximately 250 ft above and 400 ft horizontal. I simply did not follow through in looking for the traffic and following instructions. I was not distraction and have no other explanations. I can sum it up with 1 word: complacency.

Original NASA ASRS Text

Title: A BE35 PLT DEPARTING BFI WAS CLRED TO TURN XWIND AFTER PASSING TFC ON DOWNWIND; BUT HE TURNED EARLY AND HAD AN NMAC WITH THE OTHER ACFT.

Narrative: MY ATC TKOF CLRNC WAS TO DEPART RWY 31L AND TO TURN XWIND AFTER PASSING TFC IN THE DOWNWIND. I DID NOT SEE THE TFC FROM THE GND AND PROCEEDED TO TAKE OFF. AT THE STANDARD 500 FT ALT ON THE UPWIND; I STARTED A L XWIND TURN. ABOUT 1/2 WAY THROUGH THE TURN I SAW THE CONFLICTING TFC COMING AT ME IN THE DOWNWIND. I CLBED AND CLRED THE TFC APPROX 250 FT ABOVE AND 400 FT HORIZ. I SIMPLY DID NOT FOLLOW THROUGH IN LOOKING FOR THE TFC AND FOLLOWING INSTRUCTIONS. I WAS NOT DISTR AND HAVE NO OTHER EXPLANATIONS. I CAN SUM IT UP WITH 1 WORD: COMPLACENCY.

Data retrieved from NASA's ASRS site as of January 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.