Instructor with spi makes off airport landing when practicing emergency lndgs.

Attributes
ACN	314149
Time
Date	199508
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : spa airport : 7a1
State Reference	SC
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	cruise other other other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : first officer instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 1800 flight time type : 800
ASRS Report	314149
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : student
Experience	flight time total : 10
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After practicing basic VFR maneuvers and a simulated emergency engine out approach and go around at lqk returning back to gmu (home base) at 2500 ft MSL, I shut off the fuel shutoff valve momentarily (10-15 seconds) to simulate an engine failure. There were several emergency landing fields available and the 10 hour student slowed the airplane down to 50-55 KIAS. The student went slowly through the emergency checklist but because of the low airspeed the engine RPM deteriorated so rapidly the engine stopped turning over although I turned the fuel on, mixture rich, throttle at idle, carburetor heat on and primer in and locked. I asked the student to start the engine with the starter key but then decided to do this myself. The starter engaged but did not turn the engine over. Therefore I decided after 3 attempts to airstart the engine by pitching down and fly 100 KIAS. Because the starter was still engaged the engine did not turn over. I informed greer approach we had an actual engine failure and landed 10 west of 7a1 in an already selected field. No injuries and damage occurred. We completed the shutdown checklist and informed greer approach and the flight school we were ok. After 1 hour the a&P mechanic checked the airplane, noted the starter was still engaged and made the starter turn the engine over. Later we discovered a partially failing starter switch when the pressure applied when turning the key is too high. Comments and attributing factors: I did not react fast enough to prevent the engine from turning too slow to restart quickly and eventually stop turning. I let the airplane being slowed by the student too much so the propeller stopped windmilling. The starter switch had a mechanical problem unknown at that time to me. I should not have turned the fuel selector off at a position/altitude that did not permit a glide to an airport. The high ambient temperature may have caused vapor lock. I was overworked and tired at the time of the event.

Original NASA ASRS Text

Title: INSTRUCTOR WITH SPI MAKES OFF ARPT LNDG WHEN PRACTICING EMER LNDGS.

Narrative: AFTER PRACTICING BASIC VFR MANEUVERS AND A SIMULATED EMER ENG OUT APCH AND GAR AT LQK RETURNING BACK TO GMU (HOME BASE) AT 2500 FT MSL, I SHUT OFF THE FUEL SHUTOFF VALVE MOMENTARILY (10-15 SECONDS) TO SIMULATE AN ENG FAILURE. THERE WERE SEVERAL EMER LNDG FIELDS AVAILABLE AND THE 10 HR STUDENT SLOWED THE AIRPLANE DOWN TO 50-55 KIAS. THE STUDENT WENT SLOWLY THROUGH THE EMER CHKLIST BUT BECAUSE OF THE LOW AIRSPD THE ENG RPM DETERIORATED SO RAPIDLY THE ENG STOPPED TURNING OVER ALTHOUGH I TURNED THE FUEL ON, MIXTURE RICH, THROTTLE AT IDLE, CARBURETOR HEAT ON AND PRIMER IN AND LOCKED. I ASKED THE STUDENT TO START THE ENG WITH THE STARTER KEY BUT THEN DECIDED TO DO THIS MYSELF. THE STARTER ENGAGED BUT DID NOT TURN THE ENG OVER. THEREFORE I DECIDED AFTER 3 ATTEMPTS TO AIRSTART THE ENG BY PITCHING DOWN AND FLY 100 KIAS. BECAUSE THE STARTER WAS STILL ENGAGED THE ENG DID NOT TURN OVER. I INFORMED GREER APCH WE HAD AN ACTUAL ENG FAILURE AND LANDED 10 W OF 7A1 IN AN ALREADY SELECTED FIELD. NO INJURIES AND DAMAGE OCCURRED. WE COMPLETED THE SHUTDOWN CHKLIST AND INFORMED GREER APCH AND THE FLT SCHOOL WE WERE OK. AFTER 1 HR THE A&P MECH CHKED THE AIRPLANE, NOTED THE STARTER WAS STILL ENGAGED AND MADE THE STARTER TURN THE ENG OVER. LATER WE DISCOVERED A PARTIALLY FAILING STARTER SWITCH WHEN THE PRESSURE APPLIED WHEN TURNING THE KEY IS TOO HIGH. COMMENTS AND ATTRIBUTING FACTORS: I DID NOT REACT FAST ENOUGH TO PREVENT THE ENG FROM TURNING TOO SLOW TO RESTART QUICKLY AND EVENTUALLY STOP TURNING. I LET THE AIRPLANE BEING SLOWED BY THE STUDENT TOO MUCH SO THE PROP STOPPED WINDMILLING. THE STARTER SWITCH HAD A MECHANICAL PROB UNKNOWN AT THAT TIME TO ME. I SHOULD NOT HAVE TURNED THE FUEL SELECTOR OFF AT A POS/ALT THAT DID NOT PERMIT A GLIDE TO AN ARPT. THE HIGH AMBIENT TEMP MAY HAVE CAUSED VAPOR LOCK. I WAS OVERWORKED AND TIRED AT THE TIME OF THE EVENT.

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.