Corp aircraft has near midair collision with small aircraft doing maneuvers.

Attributes
ACN	221071
Time
Date	199209
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lvk
State Reference	CA
Altitude	msl bound lower : 4500 msl bound upper : 4500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak tower : orh
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 80 flight time total : 4100
ASRS Report	221071
Person 2
Affiliation	Other
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 other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were descending out of 4500 ft with the first officer flying and me performing the descent checklist when the first officer jerked up on the controls and said 'oh shit.' I immediately looked out to watch as we passed right over the top of an small aircraft in slow flight. Many factors led to this incident. First was that an out of the ordinary situation arose when bay approach would not take a handoff from stockton approach on us. We always either fly IFR or VFR with advisories. This day we were VFR, and because of a busy controller, without advisories. I believe in see and avoid, but this situation threw me a little since I had to determine how to get with bay to penetrate the san jose arsa. That delayed my performing the descent checklist till later than normal. Frequency 135.4 and its attendant sector is almost always busy, perhaps they could redesign it a little or add another controller. I feel pretty vigilant in regards to scanning for traffic, perhaps I'll work even harder now.

Original NASA ASRS Text

Title: CORP ACFT HAS NMAC WITH SMA DOING MANEUVERS.

Narrative: WE WERE DSNDING OUT OF 4500 FT WITH THE FO FLYING AND ME PERFORMING THE DSCNT CHKLIST WHEN THE FO JERKED UP ON THE CTLS AND SAID 'OH SHIT.' I IMMEDIATELY LOOKED OUT TO WATCH AS WE PASSED RIGHT OVER THE TOP OF AN SMA IN SLOW FLT. MANY FACTORS LED TO THIS INCIDENT. FIRST WAS THAT AN OUT OF THE ORDINARY SITUATION AROSE WHEN BAY APCH WOULD NOT TAKE A HDOF FROM STOCKTON APCH ON US. WE ALWAYS EITHER FLY IFR OR VFR WITH ADVISORIES. THIS DAY WE WERE VFR, AND BECAUSE OF A BUSY CTLR, WITHOUT ADVISORIES. I BELIEVE IN SEE AND AVOID, BUT THIS SITUATION THREW ME A LITTLE SINCE I HAD TO DETERMINE HOW TO GET WITH BAY TO PENETRATE THE SAN JOSE ARSA. THAT DELAYED MY PERFORMING THE DSCNT CHKLIST TILL LATER THAN NORMAL. FREQ 135.4 AND ITS ATTENDANT SECTOR IS ALMOST ALWAYS BUSY, PERHAPS THEY COULD REDESIGN IT A LITTLE OR ADD ANOTHER CTLR. I FEEL PRETTY VIGILANT IN REGARDS TO SCANNING FOR TFC, PERHAPS I'LL WORK EVEN HARDER NOW.

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.