Beechcraft P35 and a C172 training slow flight have near midair collision at thv.

Attributes
ACN	706142
Time
Date	200608
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : thv.airport
State Reference	PA
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mdt.tracon
Operator	general aviation : personal
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Flight Plan	None
Aircraft 2
Controlling Facilities	tracon : mdt.tracon
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 25 flight time total : 3170 flight time type : 2000
ASRS Report	706142
Person 2
Affiliation	other
Function	instruction : instructor oversight : pic
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Miss Distance	horizontal : 50 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure
Primary Problem	Flight Crew Human Performance

Narrative:

The cessna airplane was in the process of turning slow flight training. The bonanza had made a descending right turn. Both airplanes were obscured from each other due to their wings blocking the other plane. As the cessna came around; the flight instructor saw the bonanza. The planes were clear of each other and no evasive action was required. The event might have been prevented if the pilots made shallower turns and scanned the area more closely.

Original NASA ASRS Text

Title: BEECHCRAFT P35 AND A C172 TRAINING SLOW FLT HAVE NMAC AT THV.

Narrative: THE CESSNA AIRPLANE WAS IN THE PROCESS OF TURNING SLOW FLT TRAINING. THE BONANZA HAD MADE A DSNDING R TURN. BOTH AIRPLANES WERE OBSCURED FROM EACH OTHER DUE TO THEIR WINGS BLOCKING THE OTHER PLANE. AS THE CESSNA CAME AROUND; THE FLT INSTRUCTOR SAW THE BONANZA. THE PLANES WERE CLR OF EACH OTHER AND NO EVASIVE ACTION WAS REQUIRED. THE EVENT MIGHT HAVE BEEN PREVENTED IF THE PLTS MADE SHALLOWER TURNS AND SCANNED THE AREA MORE CLOSELY.

Data retrieved from NASA's ASRS site as of January 2009 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.