Light aircraft makes forced landing in ojc airspace due to engine failure.

Attributes
ACN	412676
Time
Date	199808
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ojc
State Reference	KS
Altitude	agl bound lower : 1000 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ojc
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : cfi pilot : instrument pilot : commercial
Experience	flight time last 90 days : 50 flight time total : 4800 flight time type : 3000
ASRS Report	412676
Person 2
Affiliation	Other
Function	instruction : trainee
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other Other
Supplementary
Primary Problem	Aircraft

Narrative:

Returning from the practice area, we selected an emergency landing area and descended from 3500 ft to 2000 ft MSL (1000 ft AGL) to practice a rectangular pattern. Entering the maneuver downwind, the engine lost power, began shaking and running very rough. I took control and set up for an emergency landing. We called ojc tower, advised our position and intentions to land in the grass pasture. The approach and landing was uneventful -- no damage and no injuries. The engine had blown a cylinder due to a frozen valve. If we had tried to make the airport, I felt the engine might have started to come apart. It produced 1300-1400 RPM and there was no indication of smoke, oil or fire, yet I had already picked a good field, so we landed safely. There was no question in my mind that we would try to attempt the runway, 6 mi north of us. I think it's important to always think of the terrain beneath the aircraft and locate a good landing area prior to descent. The outcome could easily have been different if we had not planned for the possible emergency before we even took off. This was my first actual engine failure in 25 yrs of flying. It is different, but repetitive training allowed me to easily glide the aircraft to a safe stop.

Original NASA ASRS Text

Title: LIGHT ACFT MAKES FORCED LNDG IN OJC AIRSPACE DUE TO ENG FAILURE.

Narrative: RETURNING FROM THE PRACTICE AREA, WE SELECTED AN EMER LNDG AREA AND DSNDED FROM 3500 FT TO 2000 FT MSL (1000 FT AGL) TO PRACTICE A RECTANGULAR PATTERN. ENTERING THE MANEUVER DOWNWIND, THE ENG LOST PWR, BEGAN SHAKING AND RUNNING VERY ROUGH. I TOOK CTL AND SET UP FOR AN EMER LNDG. WE CALLED OJC TWR, ADVISED OUR POS AND INTENTIONS TO LAND IN THE GRASS PASTURE. THE APCH AND LNDG WAS UNEVENTFUL -- NO DAMAGE AND NO INJURIES. THE ENG HAD BLOWN A CYLINDER DUE TO A FROZEN VALVE. IF WE HAD TRIED TO MAKE THE ARPT, I FELT THE ENG MIGHT HAVE STARTED TO COME APART. IT PRODUCED 1300-1400 RPM AND THERE WAS NO INDICATION OF SMOKE, OIL OR FIRE, YET I HAD ALREADY PICKED A GOOD FIELD, SO WE LANDED SAFELY. THERE WAS NO QUESTION IN MY MIND THAT WE WOULD TRY TO ATTEMPT THE RWY, 6 MI N OF US. I THINK IT'S IMPORTANT TO ALWAYS THINK OF THE TERRAIN BENEATH THE ACFT AND LOCATE A GOOD LNDG AREA PRIOR TO DSCNT. THE OUTCOME COULD EASILY HAVE BEEN DIFFERENT IF WE HAD NOT PLANNED FOR THE POSSIBLE EMER BEFORE WE EVEN TOOK OFF. THIS WAS MY FIRST ACTUAL ENG FAILURE IN 25 YRS OF FLYING. IT IS DIFFERENT, BUT REPETITIVE TRAINING ALLOWED ME TO EASILY GLIDE THE ACFT TO A SAFE STOP.

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.