Near midair collision between a C340 in a steep turn and descending crossing traffic, a bonanza.

Attributes
ACN	360626
Time
Date	199702
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sli
State Reference	CA
Altitude	msl bound lower : 4500 msl bound upper : 4500
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : lax
Operator	general aviation : personal
Make Model Name	Cessna 340/340A
Operating Under FAR Part	Part 91
Flight Phase	cruise other cruise other
Route In Use	enroute airway : v21
Flight Plan	None
Aircraft 2
Make Model Name	Bonanza 33
Operating Under FAR Part	Part 91
Flight Phase	descent : approach descent other
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 4240 flight time type : 3
ASRS Report	360626
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 60 flight time total : 3000 flight time type : 1500
ASRS Report	366708
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew Other
Miss Distance	horizontal : 100 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation Operational Deviation

Narrative:

I was acting as instructor during a flight revue in the customer's own C340. He proceeded to attempt a r-hand 45 degree bank, 360 degree turn. The first attempt was aborted due to incorrect roll-in. The second attempt was completed. The next turn was a l-hand 45 degree bank, 360 degree turn. We were turning through approximately a 360 degree heading. Approximately 30 degrees prior to rollout, I noticed a BE33 or BE36 passing approximately 200-300 ft beneath us. We were on a southerly heading. The aircraft passing beneath us was passing left to right on a westerly heading. As I first noticed the aircraft as it was passing beneath us, no evasive action was taken on our part. Upon approach to lgb, we were asked to call socal approach control after landing. After calling socal, I learned that the pilot of the other aircraft had filed a near miss report. The pilot had stated that he had passed beneath us, and we above him, 2 or 3 times while on approach to toa. Unless he was the aircraft that passed above us, we only had him in sight at one time. Contributing factors to our late discovery of the other aircraft could be the limited visibility in the direction of turn in the C340, especially from the seat opposite direction of turn. If the pilot of the other aircraft had us in sight, I do not know why (or if) he stayed on a course and altitude that would cause questionable separation. One possibility would be that our fairly steep turn was not anticipated by the pilot.

Original NASA ASRS Text

Title: NMAC BTWN A C340 IN A STEEP TURN AND DSNDING XING TFC, A BONANZA.

Narrative: I WAS ACTING AS INSTRUCTOR DURING A FLT REVUE IN THE CUSTOMER'S OWN C340. HE PROCEEDED TO ATTEMPT A R-HAND 45 DEG BANK, 360 DEG TURN. THE FIRST ATTEMPT WAS ABORTED DUE TO INCORRECT ROLL-IN. THE SECOND ATTEMPT WAS COMPLETED. THE NEXT TURN WAS A L-HAND 45 DEG BANK, 360 DEG TURN. WE WERE TURNING THROUGH APPROX A 360 DEG HEADING. APPROX 30 DEGS PRIOR TO ROLLOUT, I NOTICED A BE33 OR BE36 PASSING APPROX 200-300 FT BENEATH US. WE WERE ON A SOUTHERLY HEADING. THE ACFT PASSING BENEATH US WAS PASSING L TO R ON A WESTERLY HEADING. AS I FIRST NOTICED THE ACFT AS IT WAS PASSING BENEATH US, NO EVASIVE ACTION WAS TAKEN ON OUR PART. UPON APCH TO LGB, WE WERE ASKED TO CALL SOCAL APCH CTL AFTER LNDG. AFTER CALLING SOCAL, I LEARNED THAT THE PLT OF THE OTHER ACFT HAD FILED A NEAR MISS RPT. THE PLT HAD STATED THAT HE HAD PASSED BENEATH US, AND WE ABOVE HIM, 2 OR 3 TIMES WHILE ON APCH TO TOA. UNLESS HE WAS THE ACFT THAT PASSED ABOVE US, WE ONLY HAD HIM IN SIGHT AT ONE TIME. CONTRIBUTING FACTORS TO OUR LATE DISCOVERY OF THE OTHER ACFT COULD BE THE LIMITED VISIBILITY IN THE DIRECTION OF TURN IN THE C340, ESPECIALLY FROM THE SEAT OPPOSITE DIRECTION OF TURN. IF THE PLT OF THE OTHER ACFT HAD US IN SIGHT, I DO NOT KNOW WHY (OR IF) HE STAYED ON A COURSE AND ALT THAT WOULD CAUSE QUESTIONABLE SEPARATION. ONE POSSIBILITY WOULD BE THAT OUR FAIRLY STEEP TURN WAS NOT ANTICIPATED BY THE PLT.

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.