2 light aircraft during instructional flight have near midair collision.

Attributes
ACN	550847
Time
Date	200206
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : vny.airport
State Reference	CA
Altitude	msl single value : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	approach : circling approach other
Flight Plan	None
Aircraft 2
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	approach other
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 80 flight time total : 370 flight time type : 75
ASRS Report	550847
Person 2
Affiliation	other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Instructing student on ground reference maneuvers. Advised and demonstrated how to clear the area of other traffic. Started to do turns around a point. Another aircraft descended toward our location from the northeast. I took the flight controls and rapidly descended and turned away from the aircraft. Aircraft continued to descend toward us and started to do 'ground reference' maneuvers. Low visibility was probably a factor.

Original NASA ASRS Text

Title: 2 LIGHT ACFT DURING INSTRUCTIONAL FLT HAVE NMAC.

Narrative: INSTRUCTING STUDENT ON GND REF MANEUVERS. ADVISED AND DEMONSTRATED HOW TO CLR THE AREA OF OTHER TFC. STARTED TO DO TURNS AROUND A POINT. ANOTHER ACFT DSNDED TOWARD OUR LOCATION FROM THE NE. I TOOK THE FLT CTLS AND RAPIDLY DSNDED AND TURNED AWAY FROM THE ACFT. ACFT CONTINUED TO DSND TOWARD US AND STARTED TO DO 'GND REF' MANEUVERS. LOW VISIBILITY WAS PROBABLY A FACTOR.

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.