Air carrier X had near midair collision with ultralight in class B airspace.

Attributes
ACN	302039
Time
Date	199504
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mia
State Reference	FL
Altitude	msl bound lower : 2800 msl bound upper : 2800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia artcc : zmp
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Ultralight
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	302039
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac non adherence : far non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X departed on runway 12 at mia. First officer advised an ultralight passed under, approximately 200-400 ft. Our altitude was approximately 2800 ft climbing. I immediately advised ATC, then called company dispatch to follow up. My concern that our turbulence may have upset the ultralight or another departing aircraft could collide. Neither TCASII nor ATC radar can see and advise.

Original NASA ASRS Text

Title: ACR X HAD NMAC WITH ULTRALIGHT IN CLASS B AIRSPACE.

Narrative: ACR X DEPARTED ON RWY 12 AT MIA. FO ADVISED AN ULTRALIGHT PASSED UNDER, APPROX 200-400 FT. OUR ALT WAS APPROX 2800 FT CLBING. I IMMEDIATELY ADVISED ATC, THEN CALLED COMPANY DISPATCH TO FOLLOW UP. MY CONCERN THAT OUR TURB MAY HAVE UPSET THE ULTRALIGHT OR ANOTHER DEPARTING ACFT COULD COLLIDE. NEITHER TCASII NOR ATC RADAR CAN SEE AND ADVISE.

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.