C152 has near midair collision.

Attributes
ACN	448301
Time
Date	199909
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bfi.airport
State Reference	WA
Altitude	msl single value : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bfi.tower
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	landing other
Route In Use	approach : traffic pattern
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : bfi.tower
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	landing other
Route In Use	approach : visual
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : commercial pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 410 flight time type : 100
ASRS Report	448301
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

We were on a right downwind to runway 13R. Other aircraft was apparently on a straight-in approach to same runway. Local controller advised us that he would let us know when we could turn to base. When he did say so, we did, glancing up toward the final approach track to check for traffic, but we didn't see any. As we turned onto final, the other aircraft called tower to find out why there was an aircraft in front of him, presumably us. Tower told us to immediately turn to the right to avoid conflict. As we turned, I saw the other aircraft pass under us. We both should not have trusted tower to spot conflicts and instead should have kept a wary eye out for each other.

Original NASA ASRS Text

Title: C152 HAS NMAC.

Narrative: WE WERE ON A R DOWNWIND TO RWY 13R. OTHER ACFT WAS APPARENTLY ON A STRAIGHT-IN APCH TO SAME RWY. LCL CTLR ADVISED US THAT HE WOULD LET US KNOW WHEN WE COULD TURN TO BASE. WHEN HE DID SAY SO, WE DID, GLANCING UP TOWARD THE FINAL APCH TRACK TO CHK FOR TFC, BUT WE DIDN'T SEE ANY. AS WE TURNED ONTO FINAL, THE OTHER ACFT CALLED TWR TO FIND OUT WHY THERE WAS AN ACFT IN FRONT OF HIM, PRESUMABLY US. TWR TOLD US TO IMMEDIATELY TURN TO THE R TO AVOID CONFLICT. AS WE TURNED, I SAW THE OTHER ACFT PASS UNDER US. WE BOTH SHOULD NOT HAVE TRUSTED TWR TO SPOT CONFLICTS AND INSTEAD SHOULD HAVE KEPT A WARY EYE OUT FOR EACH OTHER.

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.