Cessna 152 in cruise at 3500 ft declared an emergency and made an off field landing due to rough engine and low oil pressure. After maintenance inspection the airplane was ferried to the home base for repairs.

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Attributes
ACN	547786
Time
Date	200205
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : zzz.vortac
State Reference	US
Altitude	msl single value : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 40 flight time total : 2278 flight time type : 200
ASRS Report	547786
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : oil pressure indication other flight crewa other flight crewb
Resolutory Action	flight crew : landed as precaution
Consequence	other other Other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : inspection performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : repair
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Flight Crew Human Performance

Narrative:

My student noticed the engine beginning to run rough and I saw the oil pressure gauge on the redline on the low side of the green. We notified ATC of our mechanical situation. There was a drag strip below us that was not in use at the time. We decided the best course of action would be to set it down on the drag strip rather than risk a complete loss of engine power from continuing to our home airport, ZZZ1. There were no injuries or property damage. Callback conversation with reporter revealed the following information: the reporter stated the combination of the rough running engine and low oil pressure was the reason for the emergency off field landing. The reporter said when the fixed base operator technician arrived and checked the engine it's condition was the same as in-flight, rough running and low oil pressure. The reporter stated the technician ran the engine and advised a maintenance ferry to the fixed base operators repair facility. The reporter said operating the engine with nothing done to correct its condition was not easy to accept. The reporter stated the technician assured myself and the student the engine was operable and would make the maintenance ferry with no problem. The reporter said against his better judgement the maintenance ferry was flown and accomplished. The reporter stated that he is no longer employed by this operator.

Original NASA ASRS Text

Title: CESSNA 152 IN CRUISE AT 3500 FT DECLARED AN EMER AND MADE AN OFF FIELD LNDG DUE TO ROUGH ENG AND LOW OIL PRESSURE. AFTER MAINT INSPECTION THE AIRPLANE WAS FERRIED TO THE HOME BASE FOR REPAIRS.

Narrative: MY STUDENT NOTICED THE ENG BEGINNING TO RUN ROUGH AND I SAW THE OIL PRESSURE GAUGE ON THE REDLINE ON THE LOW SIDE OF THE GREEN. WE NOTIFIED ATC OF OUR MECHANICAL SIT. THERE WAS A DRAG STRIP BELOW US THAT WAS NOT IN USE AT THE TIME. WE DECIDED THE BEST COURSE OF ACTION WOULD BE TO SET IT DOWN ON THE DRAG STRIP RATHER THAN RISK A COMPLETE LOSS OF ENG PWR FROM CONTINUING TO OUR HOME ARPT, ZZZ1. THERE WERE NO INJURIES OR PROPERTY DAMAGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE COMBINATION OF THE ROUGH RUNNING ENG AND LOW OIL PRESSURE WAS THE REASON FOR THE EMER OFF FIELD LNDG. THE RPTR SAID WHEN THE FIXED BASE OPERATOR TECHNICIAN ARRIVED AND CHKED THE ENG IT'S CONDITION WAS THE SAME AS INFLT, ROUGH RUNNING AND LOW OIL PRESSURE. THE RPTR STATED THE TECHNICIAN RAN THE ENG AND ADVISED A MAINT FERRY TO THE FIXED BASE OPERATORS REPAIR FACILITY. THE RPTR SAID OPERATING THE ENG WITH NOTHING DONE TO CORRECT ITS CONDITION WAS NOT EASY TO ACCEPT. THE RPTR STATED THE TECHNICIAN ASSURED MYSELF AND THE STUDENT THE ENG WAS OPERABLE AND WOULD MAKE THE MAINT FERRY WITH NO PROB. THE RPTR SAID AGAINST HIS BETTER JUDGEMENT THE MAINT FERRY WAS FLOWN AND ACCOMPLISHED. THE RPTR STATED THAT HE IS NO LONGER EMPLOYED BY THIS OPERATOR.

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.