Close proximity air carrier-widebody transport GA-ult.

Attributes
ACN	121749
Time
Date	198909
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ont
State Reference	CA
Altitude	msl bound lower : 4000 msl bound upper : 4300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ont
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Ultralight
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 80 flight time total : 30000 flight time type : 4000
ASRS Report	121749
Person 2
Affiliation	government : faa
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Flying direct from san to petis about abeam march AFB we flew directly over an ultralight. We never saw it until we were right on top of it. A turn to right was executed and rate of descent stopped. Terrain avoidance warning went off. Ont approach did not have him on scope. Ultralight had to beat 4000' reported above to ont approach. The ultralight was traveling same direction as we were.

Original NASA ASRS Text

Title: CLOSE PROX ACR-WDB GA-ULT.

Narrative: FLYING DIRECT FROM SAN TO PETIS ABOUT ABEAM MARCH AFB WE FLEW DIRECTLY OVER AN ULTRALIGHT. WE NEVER SAW IT UNTIL WE WERE RIGHT ON TOP OF IT. A TURN TO RIGHT WAS EXECUTED AND RATE OF DSCNT STOPPED. TERRAIN AVOIDANCE WARNING WENT OFF. ONT APCH DID NOT HAVE HIM ON SCOPE. ULTRALIGHT HAD TO BEAT 4000' REPORTED ABOVE TO ONT APCH. THE ULTRALIGHT WAS TRAVELING SAME DIRECTION AS WE WERE.

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