Cpr small transport has close proximity with air carrier descending.

Attributes
ACN	283000
Time
Date	199409
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : oak airport : pao
State Reference	CA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	None
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 40 flight time total : 6500 flight time type : 2100
ASRS Report	283000
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

During cruise climb from pao toward sck, I saw an aircraft approximately 5 mi, 1-2 O'clock, descending. As aircraft came closer, I idented it as a 737, still descending. I stopped climb and prepared to take evasive action if necessary, but adequate separation resulted, although I have never seen an air carrier at that low of an altitude in that area. I had contacted bay approach after departure but was told to standby by due to workload. I never heard approach call the traffic (me) for the 737, although air carrier may have been on another frequency. The fremont area is apparently a place where changes from one sector to another occur.

Original NASA ASRS Text

Title: CPR SMT HAS CLOSE PROX WITH ACR DSNDING.

Narrative: DURING CRUISE CLB FROM PAO TOWARD SCK, I SAW AN ACFT APPROX 5 MI, 1-2 O'CLOCK, DSNDING. AS ACFT CAME CLOSER, I IDENTED IT AS A 737, STILL DSNDING. I STOPPED CLB AND PREPARED TO TAKE EVASIVE ACTION IF NECESSARY, BUT ADEQUATE SEPARATION RESULTED, ALTHOUGH I HAVE NEVER SEEN AN ACR AT THAT LOW OF AN ALT IN THAT AREA. I HAD CONTACTED BAY APCH AFTER DEP BUT WAS TOLD TO STANDBY BY DUE TO WORKLOAD. I NEVER HEARD APCH CALL THE TFC (ME) FOR THE 737, ALTHOUGH ACR MAY HAVE BEEN ON ANOTHER FREQ. THE FREMONT AREA IS APPARENTLY A PLACE WHERE CHANGES FROM ONE SECTOR TO ANOTHER OCCUR.

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.