Instructor pilot of a C172 gives student pilot simulated emergency landing over a wide open field area while being with approach controller for VFR advisories. Since approach controller is not aware of them circling down low out of radar coverage for practice forced lndgs, the controller intervenes when the aircraft is climbing back up and questions altitude and cancels radar TA service.

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Attributes
ACN	417810
Time
Date	199810
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : c83
State Reference	CA
Altitude	agl bound lower : 400 agl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sck tower : msp
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 20 flight time total : 1400 flight time type : 550
ASRS Report	417810
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : student
Events
Anomaly	other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Instructor (reporter) and student flight in the vicinity of byron, ca, airport in a C172 in day VFR. Instructor simulates emergency power loss (idle throttle) at 2500 ft. We are with stockton approach for TA's. We circle to land in a field (unpopulated area for several mi all directions). Instructor plans to stop descent at 500 ft AGL and discontinue training. We descended to approximately 400+ ft AGL before beginning climb out. Stockton approach questions altitude and terminates VFR advisory service. Lessons learned: 1) prefer to simulate engine out over uncontrolled airports where landing is possible 'just in case.' 2) pay close attention to MSA's as suggested minimums far 91.119. 3) do not 'scare' approach by sudden descent into uncontrolled airspace.

Original NASA ASRS Text

Title: INSTRUCTOR PLT OF A C172 GIVES STUDENT PLT SIMULATED EMER LNDG OVER A WIDE OPEN FIELD AREA WHILE BEING WITH APCH CTLR FOR VFR ADVISORIES. SINCE APCH CTLR IS NOT AWARE OF THEM CIRCLING DOWN LOW OUT OF RADAR COVERAGE FOR PRACTICE FORCED LNDGS, THE CTLR INTERVENES WHEN THE ACFT IS CLBING BACK UP AND QUESTIONS ALT AND CANCELS RADAR TA SVC.

Narrative: INSTRUCTOR (RPTR) AND STUDENT FLT IN THE VICINITY OF BYRON, CA, ARPT IN A C172 IN DAY VFR. INSTRUCTOR SIMULATES EMER PWR LOSS (IDLE THROTTLE) AT 2500 FT. WE ARE WITH STOCKTON APCH FOR TA'S. WE CIRCLE TO LAND IN A FIELD (UNPOPULATED AREA FOR SEVERAL MI ALL DIRECTIONS). INSTRUCTOR PLANS TO STOP DSCNT AT 500 FT AGL AND DISCONTINUE TRAINING. WE DSNDED TO APPROX 400+ FT AGL BEFORE BEGINNING CLBOUT. STOCKTON APCH QUESTIONS ALT AND TERMINATES VFR ADVISORY SVC. LESSONS LEARNED: 1) PREFER TO SIMULATE ENG OUT OVER UNCTLED ARPTS WHERE LNDG IS POSSIBLE 'JUST IN CASE.' 2) PAY CLOSE ATTN TO MSA'S AS SUGGESTED MINIMUMS FAR 91.119. 3) DO NOT 'SCARE' APCH BY SUDDEN DSCNT INTO UNCTLED AIRSPACE.

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.