Cpr small transport nearly collided with small aircraft while on base leg, descending for landing.

Attributes
ACN	89739
Time
Date	198806
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : smf
State Reference	CA
Altitude	msl bound lower : 2500 msl bound upper : 2700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : smf
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial
Experience	flight time last 90 days : 90 flight time total : 1300 flight time type : 550
ASRS Report	89739
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 100 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Making visual approach to left downwind to 34L (smf) at 3000' MSL. Following medium large transport on 3 mi final 34L. Started turn towards base leg and detected motion to the left. The early model, small aircraft Y passed from the nose to left wing tip. Not even enough time to take evasive actions to avoid. Had a left windscreen full of small aircraft Y. We were just letting down thru 2700' MSL when I noticed small aircraft Y. It was so close I remember seeing its 2 inch north numbers. We asked tower if they had him on radar, they said no. We were slowing thru 180 KTS in a left slightly nose high position to slow down for final. Small aircraft Y not only penetrated an arsa, also an air traffic area. The tower eventually had approach control track this aircraft. He was from a local airport, on a flight to red bluff. This was too much excitement for one day. Landed ok and called tower for more information. All pilots need to make sure they know their airspace. As a cfii, airspace knowledge will become an even more discussed topic with students. Cause of problem: idiot, careless, uninformed, and lost pilot in airspace he should not have been in. Rule learned, keep your eyes looking for traffic even in what appears to be safe and controled airspace.

Original NASA ASRS Text

Title: CPR SMT NEARLY COLLIDED WITH SMA WHILE ON BASE LEG, DESCENDING FOR LNDG.

Narrative: MAKING VISUAL APCH TO LEFT DOWNWIND TO 34L (SMF) AT 3000' MSL. FOLLOWING MLG ON 3 MI FINAL 34L. STARTED TURN TOWARDS BASE LEG AND DETECTED MOTION TO THE LEFT. THE EARLY MODEL, SMA Y PASSED FROM THE NOSE TO LEFT WING TIP. NOT EVEN ENOUGH TIME TO TAKE EVASIVE ACTIONS TO AVOID. HAD A LEFT WINDSCREEN FULL OF SMA Y. WE WERE JUST LETTING DOWN THRU 2700' MSL WHEN I NOTICED SMA Y. IT WAS SO CLOSE I REMEMBER SEEING ITS 2 INCH N NUMBERS. WE ASKED TWR IF THEY HAD HIM ON RADAR, THEY SAID NO. WE WERE SLOWING THRU 180 KTS IN A LEFT SLIGHTLY NOSE HIGH POSITION TO SLOW DOWN FOR FINAL. SMA Y NOT ONLY PENETRATED AN ARSA, ALSO AN ATA. THE TWR EVENTUALLY HAD APCH CTL TRACK THIS ACFT. HE WAS FROM A LOCAL ARPT, ON A FLT TO RED BLUFF. THIS WAS TOO MUCH EXCITEMENT FOR ONE DAY. LANDED OK AND CALLED TWR FOR MORE INFO. ALL PLTS NEED TO MAKE SURE THEY KNOW THEIR AIRSPACE. AS A CFII, AIRSPACE KNOWLEDGE WILL BECOME AN EVEN MORE DISCUSSED TOPIC WITH STUDENTS. CAUSE OF PROBLEM: IDIOT, CARELESS, UNINFORMED, AND LOST PLT IN AIRSPACE HE SHOULD NOT HAVE BEEN IN. RULE LEARNED, KEEP YOUR EYES LOOKING FOR TFC EVEN IN WHAT APPEARS TO BE SAFE AND CTLED AIRSPACE.

Data retrieved from NASA's ASRS site as of August 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.