Near midair collision.

Attributes
ACN	300547
Time
Date	199503
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bfi
State Reference	WA
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bfi artcc : limm
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Duke 60
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 850 flight time type : 400
ASRS Report	300547
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 500 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My student and I were on a right downwind departure from bfi runway 13R. We continued to parallel the extended centerline northbound. We had leveled off at 1500 ft MSL due to a class B airspace restr (1800 ft) when I saw the duke pass our left side above us. He was in a descending right turn inbound to runway 13R at bfi. No TA was provided by bfi tower. The duke reported the near miss on tower frequency 120.6. We took no evasive action and continued to listen to bfi tower on 120.6. Tower said nothing to us and we continued northbound. I believe the incident was caused by the following factors: the inability of my student and I to see above and to our left due to our high wing aircraft. The inability of the duke to see below himself due to the low wing. The lack of TA's from the tower due to heavy frequency congestion. The duke may have gotten a late handoff from sea approach, also compounding all of the above factors. It was a very busy day at bfi, with numerous VFR and IFR departures and arrs.

Original NASA ASRS Text

Title: NMAC.

Narrative: MY STUDENT AND I WERE ON A R DOWNWIND DEP FROM BFI RWY 13R. WE CONTINUED TO PARALLEL THE EXTENDED CTRLINE NBOUND. WE HAD LEVELED OFF AT 1500 FT MSL DUE TO A CLASS B AIRSPACE RESTR (1800 FT) WHEN I SAW THE DUKE PASS OUR L SIDE ABOVE US. HE WAS IN A DSNDING R TURN INBOUND TO RWY 13R AT BFI. NO TA WAS PROVIDED BY BFI TWR. THE DUKE RPTED THE NEAR MISS ON TWR FREQ 120.6. WE TOOK NO EVASIVE ACTION AND CONTINUED TO LISTEN TO BFI TWR ON 120.6. TWR SAID NOTHING TO US AND WE CONTINUED NBOUND. I BELIEVE THE INCIDENT WAS CAUSED BY THE FOLLOWING FACTORS: THE INABILITY OF MY STUDENT AND I TO SEE ABOVE AND TO OUR L DUE TO OUR HIGH WING ACFT. THE INABILITY OF THE DUKE TO SEE BELOW HIMSELF DUE TO THE LOW WING. THE LACK OF TA'S FROM THE TWR DUE TO HVY FREQ CONGESTION. THE DUKE MAY HAVE GOTTEN A LATE HDOF FROM SEA APCH, ALSO COMPOUNDING ALL OF THE ABOVE FACTORS. IT WAS A VERY BUSY DAY AT BFI, WITH NUMEROUS VFR AND IFR DEPS AND ARRS.

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.