Close proximity air carrier-large transport GA-small aircraft northwest of fra.

Attributes
ACN	148912
Time
Date	199006
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fra airport : fat
State Reference	CA
Altitude	msl bound lower : 11700 msl bound upper : 11700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa tracon : fat
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 4000
ASRS Report	148912
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 3000 flight time type : 2000
ASRS Report	148908
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 350 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We had just been handed off from ZOA to fat approach. The first officer was head down switching frequency. A high wing small aircraft appeared at 12 O'clock slightly low. We were descending through 11900' for 11000'. I disengaged autoplt and immediately executed a right turn and a pull up. The small aircraft appeared to be eastbound at 11700'. This was later confirmed by fat approach. We passed behind the small aircraft at approximately 300-400', co-altitude. I instructed the first officer to return to center frequency on VHF #2 while I monitored approach on VHF #1. Approach was skin painting the small aircraft but was not in contact with him. Center advised my first officer that they were not painting him and that there must have been a blind spot. This small aircraft wasn't squawking 1200 above 10000' according to approach control.

Original NASA ASRS Text

Title: CLOSE PROX ACR-LGT GA-SMA NW OF FRA.

Narrative: WE HAD JUST BEEN HANDED OFF FROM ZOA TO FAT APCH. THE F/O WAS HEAD DOWN SWITCHING FREQ. A HIGH WING SMA APPEARED AT 12 O'CLOCK SLIGHTLY LOW. WE WERE DSNDING THROUGH 11900' FOR 11000'. I DISENGAGED AUTOPLT AND IMMEDIATELY EXECUTED A R TURN AND A PULL UP. THE SMA APPEARED TO BE EBND AT 11700'. THIS WAS LATER CONFIRMED BY FAT APCH. WE PASSED BEHIND THE SMA AT APPROX 300-400', CO-ALT. I INSTRUCTED THE F/O TO RETURN TO CTR FREQ ON VHF #2 WHILE I MONITORED APCH ON VHF #1. APCH WAS SKIN PAINTING THE SMA BUT WAS NOT IN CONTACT WITH HIM. CTR ADVISED MY F/O THAT THEY WERE NOT PAINTING HIM AND THAT THERE MUST HAVE BEEN A BLIND SPOT. THIS SMA WASN'T SQUAWKING 1200 ABOVE 10000' ACCORDING TO APCH CTL.

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.