2 aircraft came very close to a midair collision while landing.

Attributes
ACN	161299
Time
Date	199010
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bfi
State Reference	WA
Altitude	msl bound lower : 300 msl bound upper : 300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bfi
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
ASRS Report	161299
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

I had entered left downwind, as directed, to runway 13L when I heard a plane report in over the kingdome (north). He was directed by the tower to enter straight in runway 13L. When I reached the north end of the runway I asked the tower if I was to extend my downwind. I received no reply. A short time later I inquired about the traffic straight in on runway 13L and got no reply. After an extended downwind I turned base and final. When on short final, the other aircraft appeared in front of me by less than 100' and less than 100' below. I pulled up and left of the runway while calling the tower telling them they had 2 aircraft on short final runway 13L. The tower instructed me to 'turn right and head southeast'--a rather confusing combination to say the least. After my second approach and landing the tower apologized for the confusion.

Original NASA ASRS Text

Title: 2 ACFT CAME VERY CLOSE TO A MIDAIR COLLISION WHILE LNDG.

Narrative: I HAD ENTERED LEFT DOWNWIND, AS DIRECTED, TO RWY 13L WHEN I HEARD A PLANE RPT IN OVER THE KINGDOME (N). HE WAS DIRECTED BY THE TWR TO ENTER STRAIGHT IN RWY 13L. WHEN I REACHED THE N END OF THE RWY I ASKED THE TWR IF I WAS TO EXTEND MY DOWNWIND. I RECEIVED NO REPLY. A SHORT TIME LATER I INQUIRED ABOUT THE TFC STRAIGHT IN ON RWY 13L AND GOT NO REPLY. AFTER AN EXTENDED DOWNWIND I TURNED BASE AND FINAL. WHEN ON SHORT FINAL, THE OTHER ACFT APPEARED IN FRONT OF ME BY LESS THAN 100' AND LESS THAN 100' BELOW. I PULLED UP AND LEFT OF THE RWY WHILE CALLING THE TWR TELLING THEM THEY HAD 2 ACFT ON SHORT FINAL RWY 13L. THE TWR INSTRUCTED ME TO 'TURN RIGHT AND HEAD SE'--A RATHER CONFUSING COMBINATION TO SAY THE LEAST. AFTER MY SECOND APCH AND LNDG THE TWR APOLOGIZED FOR THE CONFUSION.

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.