E120 pilot avoids near midair collision near lgb.

Attributes
ACN	435346
Time
Date	199904
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lgb.airport
State Reference	CA
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon tower : abe.tower
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	general aviation : personal
Make Model Name	Bonanza 33
Operating Under FAR Part	Part 91
Flight Phase	cruise : enroute altitude change
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 10500 flight time type : 7000
ASRS Report	435346
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued alert flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flying level at 5000 ft on a vector heading parallel to the shoreline en route from lax to sna, a VFR target, 1-2 O'clock at 4500 ft, 3-5 mi range is alerted on TCASII. The traffic begins to climb, and is moving from right to left. At the 1-2 mi range on TCASII, visual contact was made which confirmed location of aircraft. My judgement told me that we were on a collision course with the intruder aircraft, and that evasive maneuvering would be required. Since the other aircraft was confirmed to be moving from right to left and had reached our altitude of 5000 ft (now at 12 O'clock) I immediately executed a 'see and avoid' maneuver by banking into a 45 degree turn to the right, which took us 1 mi behind to other aircraft. 1/2 way through our turn, ATC issued a traffic alert and also said 'I see you are turning without clearance.' after rolling out of our turn, I responded by telling ATC we had to take evasive action to avoid another aircraft.

Original NASA ASRS Text

Title: E120 PLT AVOIDS NMAC NEAR LGB.

Narrative: FLYING LEVEL AT 5000 FT ON A VECTOR HDG PARALLEL TO THE SHORELINE ENRTE FROM LAX TO SNA, A VFR TARGET, 1-2 O'CLOCK AT 4500 FT, 3-5 MI RANGE IS ALERTED ON TCASII. THE TFC BEGINS TO CLB, AND IS MOVING FROM R TO L. AT THE 1-2 MI RANGE ON TCASII, VISUAL CONTACT WAS MADE WHICH CONFIRMED LOCATION OF ACFT. MY JUDGEMENT TOLD ME THAT WE WERE ON A COLLISION COURSE WITH THE INTRUDER ACFT, AND THAT EVASIVE MANEUVERING WOULD BE REQUIRED. SINCE THE OTHER ACFT WAS CONFIRMED TO BE MOVING FROM R TO L AND HAD REACHED OUR ALT OF 5000 FT (NOW AT 12 O'CLOCK) I IMMEDIATELY EXECUTED A 'SEE AND AVOID' MANEUVER BY BANKING INTO A 45 DEG TURN TO THE R, WHICH TOOK US 1 MI BEHIND TO OTHER ACFT. 1/2 WAY THROUGH OUR TURN, ATC ISSUED A TFC ALERT AND ALSO SAID 'I SEE YOU ARE TURNING WITHOUT CLRNC.' AFTER ROLLING OUT OF OUR TURN, I RESPONDED BY TELLING ATC WE HAD TO TAKE EVASIVE ACTION TO AVOID ANOTHER ACFT.

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.