What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
N9851J a CE-150M experienced engine trouble enroute to klnk from kcbf during a training flight conducted by a 141 flight training school.
A pre-flight inspection was performed with no irregularities. The oil quantity read 5 quarts on the dipstick.
After the aircraft was airborne the aircrew had a hard time gaining altitude as they turned to head towards klnk. The instructor pilot (ip) noticed a slight engine mis-fire and turned on the carburetor (carb) heat. After 3-5 five minutes with no change in performance the carb heat was turned off.
With the throttle at full power the aircraft was only able to produce 60-65 knots at 2000 RPM. The ip made the decision to turn back and try to land at kcbf.
A few minutes after turning south, back towards kcbf, the aircrew experienced extreme engine roughness and opted to try and land at offutt air force base (koff). As they turned to approach koff the aircraft would not maintain altitude so the decision was made to make an emergency landing in a bean field directly below them.
The aircrew declared an emergency to omaha approach and was able to land the aircraft without harm to themselves or damage to the aircraft.
After the aircraft was recovered from the bean field, the director of maintenance (dom) for the flight school performed an aircraft inspection. He stated the oil dipstick was dry and the aircraft belly was coated with oil.
The cause of engine failure was due to lack of oil. There is no visual evidence of damage to the engine case or cylinders.
The dom concluded the oil was pumped overboard through the vent tube due to a blockage in the inverted oil filtration system. The blockage was caused by internal engine moisture that eventually froze due to the low engine operating temperature.
As the FAA filed it
N9851J A CE-150M EXPERIENCED ENGINE TROUBLE ENROUTE TO KLNK FROM KCBF DURING A TRAINING FLIGHT CONDUCTED BY A 141 FLIGHT TRAINING SCHOOL.
A PRE-FLIGHT INSPECTION WAS PERFORMED WITH NO IRREGULARITIES. THE OIL QUANTITY READ 5 QUARTS ON THE DIPSTICK.
AFTER THE AIRCRAFT WAS AIRBORNE THE AIRCREW HAD A HARD TIME GAINING ALTITUDE AS THEY TURNED TO HEAD TOWARDS KLNK. THE INSTRUCTOR PILOT (IP) NOTICED A SLIGHT ENGINE MIS-FIRE AND TURNED ON THE CARBURETOR (CARB) HEAT. AFTER 3-5 FIVE MINUTES WITH NO CHANGE IN PERFORMANCE THE CARB HEAT WAS TURNED OFF.
WITH THE THROTTLE AT FULL POWER THE AIRCRAFT WAS ONLY ABLE TO PRODUCE 60-65 KNOTS AT 2000 RPM. THE IP MADE THE DECISION TO TURN BACK AND TRY TO LAND AT KCBF.
A FEW MINUTES AFTER TURNING SOUTH, BACK TOWARDS KCBF, THE AIRCREW EXPERIENCED EXTREME ENGINE ROUGHNESS AND OPTED TO TRY AND LAND AT OFFUTT AIR FORCE BASE (KOFF). AS THEY TURNED TO APPROACH KOFF THE AIRCRAFT WOULD NOT MAINTAIN ALTITUDE SO THE DECISION WAS MADE TO MAKE AN EMERGENCY LANDING IN A BEAN FIELD DIRECTLY BELOW THEM.
THE AIRCREW DECLARED AN EMERGENCY TO OMAHA APPROACH AND WAS ABLE TO LAND THE AIRCRAFT WITHOUT HARM TO THEMSELVES OR DAMAGE TO THE AIRCRAFT.
AFTER THE AIRCRAFT WAS RECOVERED FROM THE BEAN FIELD, THE DIRECTOR OF MAINTENANCE (DOM) FOR THE FLIGHT SCHOOL PERFORMED AN AIRCRAFT INSPECTION. HE STATED THE OIL DIPSTICK WAS DRY AND THE AIRCRAFT BELLY WAS COATED WITH OIL.
THE CAUSE OF ENGINE FAILURE WAS DUE TO LACK OF OIL. THERE IS NO VISUAL EVIDENCE OF DAMAGE TO THE ENGINE CASE OR CYLINDERS.
THE DOM CONCLUDED THE OIL WAS PUMPED OVERBOARD THROUGH THE VENT TUBE DUE TO A BLOCKAGE IN THE INVERTED OIL FILTRATION SYSTEM. THE BLOCKAGE WAS CAUSED BY INTERNAL ENGINE MOISTURE THAT EVENTUALLY FROZE DUE TO THE LOW ENGINE OPERATING TEMPERATURE.
Other reports on N9851J · 1
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