Near midair collision between small aircraft X and cpr small transport Y in the vicinity of prb.

Attributes
ACN	155645
Time
Date	199009
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : prb
State Reference	CA
Altitude	msl bound lower : 10500 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : gso
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Route In Use	enroute airway : zla
Flight Plan	VFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 600 flight time type : 60
ASRS Report	155645
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 200 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

My aircraft small aircraft X nwbnd heading 310 degrees, en route to sql and level at 10500'. The other aircraft small transport Y was descending, heading approximately 200 degrees. Both aircraft were in contact with ZLA. Presume small transport Y was VFR but unverified. ZLA called traffic for me: '1 O'clock, 7 mi, southwest heading,' and called corresponding traffic for small transport Y. Both of us replied 'looking.' continued calls from center at 5 mi, 3 mi and 1 mi. Continued 'looking/negative contact' calls from both aircraft. At 'less than 1 mi' we both had visibility contact. I took evasive action with left turn and climb. Small transport Y passed slightly behind, slightly below. Actual position at time of visibility contact was 2-3 O'clock. Comments: I was not scanning widely enough. Actual position was 2-3 O'clock, not 1 O'clock. Also, small transport Y was on direct collision course and hence a frontal profile for the entire time making visibility contact more difficult. Neither pilot asked for nor was given altitudes or vectors for avoidance. ATC could have requested/suggested 'stop descent' or 'expedite descent' to small transport Y, but did not do so.

Original NASA ASRS Text

Title: NMAC BETWEEN SMA X AND CPR SMT Y IN THE VICINITY OF PRB.

Narrative: MY ACFT SMA X NWBND HDG 310 DEGS, ENRTE TO SQL AND LEVEL AT 10500'. THE OTHER ACFT SMT Y WAS DSNDING, HDG APPROX 200 DEGS. BOTH ACFT WERE IN CONTACT WITH ZLA. PRESUME SMT Y WAS VFR BUT UNVERIFIED. ZLA CALLED TFC FOR ME: '1 O'CLOCK, 7 MI, SW HDG,' AND CALLED CORRESPONDING TFC FOR SMT Y. BOTH OF US REPLIED 'LOOKING.' CONTINUED CALLS FROM CENTER AT 5 MI, 3 MI AND 1 MI. CONTINUED 'LOOKING/NEGATIVE CONTACT' CALLS FROM BOTH ACFT. AT 'LESS THAN 1 MI' WE BOTH HAD VIS CONTACT. I TOOK EVASIVE ACTION WITH LEFT TURN AND CLB. SMT Y PASSED SLIGHTLY BEHIND, SLIGHTLY BELOW. ACTUAL POS AT TIME OF VIS CONTACT WAS 2-3 O'CLOCK. COMMENTS: I WAS NOT SCANNING WIDELY ENOUGH. ACTUAL POS WAS 2-3 O'CLOCK, NOT 1 O'CLOCK. ALSO, SMT Y WAS ON DIRECT COLLISION COURSE AND HENCE A FRONTAL PROFILE FOR THE ENTIRE TIME MAKING VIS CONTACT MORE DIFFICULT. NEITHER PLT ASKED FOR NOR WAS GIVEN ALTS OR VECTORS FOR AVOIDANCE. ATC COULD HAVE REQUESTED/SUGGESTED 'STOP DSNT' OR 'EXPEDITE DSNT' TO SMT Y, BUT DID NOT DO SO.

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.