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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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C172 on spi training flight. Engine began running rough. Instructor attempted to restore normal power and unable. Advised hhi on 121 pt 5 he was losing power and landing on crop duster strip. Controller declared an emergency and advised would send emergency equipment. Landed without incident. Found broken rocker arm valve stud. Maintenance repaired and flew the aircraft out.
| Attributes | |
| ACN | 354539 |
| Time | |
| Date | 199611 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : hnl |
| State Reference | HI |
| Altitude | msl bound lower : 1400 msl bound upper : 1400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : hhi |
| Operator | general aviation : instructional |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 50 flight time total : 350 flight time type : 150 |
| ASRS Report | 354539 |
| Person 2 | |
| Function | flight crew : single pilot instruction : trainee |
| Qualification | pilot : student |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency other other |
| Consequence | faa : investigated |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
While a student pilot was practicing s-turns across a road at 1400 ft MSL (800 ft AGL) the engine started running very rough. (Later it was determined to be a broken rocker arm valve stud.) as a CFI, I took the aircraft controls and attempted to determine what was wrong with the engine and see if I could get it running smoother. While reviewing the emergency procedures for a loss of power during flight, I flew the aircraft toward an emergency landing site nearby. This landing site is a duster strip location in the middle of a sugarcane field. I was unable to fix the engine and was unable to maintain altitude at full throttle. As a precautionary measure I decided to land the aircraft on the duster strip rather than risk further flight back to hnl airport. I declared an engine power loss emergency on frequency 121.5 and squawked 7700 and was able to tell the controller my situation and where I was located. He said to call back when I reached the field and that he would send fire and ambulance vehicles just in case. I circled the landing site once and landed it. After landing on the duster strip with no complications I reported back on 121.5 that we were on the ground with no fire and no injuries. Later the flight school fixed the cylinder and flew the aircraft back to hnl.
Original NASA ASRS Text
Title: C172 ON SPI TRAINING FLT. ENG BEGAN RUNNING ROUGH. INSTRUCTOR ATTEMPTED TO RESTORE NORMAL PWR AND UNABLE. ADVISED HHI ON 121 PT 5 HE WAS LOSING PWR AND LNDG ON CROP DUSTER STRIP. CTLR DECLARED AN EMER AND ADVISED WOULD SEND EMER EQUIP. LANDED WITHOUT INCIDENT. FOUND BROKEN ROCKER ARM VALVE STUD. MAINT REPAIRED AND FLEW THE ACFT OUT.
Narrative: WHILE A STUDENT PLT WAS PRACTICING S-TURNS ACROSS A ROAD AT 1400 FT MSL (800 FT AGL) THE ENG STARTED RUNNING VERY ROUGH. (LATER IT WAS DETERMINED TO BE A BROKEN ROCKER ARM VALVE STUD.) AS A CFI, I TOOK THE ACFT CTLS AND ATTEMPTED TO DETERMINE WHAT WAS WRONG WITH THE ENG AND SEE IF I COULD GET IT RUNNING SMOOTHER. WHILE REVIEWING THE EMER PROCS FOR A LOSS OF PWR DURING FLT, I FLEW THE ACFT TOWARD AN EMER LNDG SITE NEARBY. THIS LNDG SITE IS A DUSTER STRIP LOCATION IN THE MIDDLE OF A SUGARCANE FIELD. I WAS UNABLE TO FIX THE ENG AND WAS UNABLE TO MAINTAIN ALT AT FULL THROTTLE. AS A PRECAUTIONARY MEASURE I DECIDED TO LAND THE ACFT ON THE DUSTER STRIP RATHER THAN RISK FURTHER FLT BACK TO HNL ARPT. I DECLARED AN ENG PWR LOSS EMER ON FREQ 121.5 AND SQUAWKED 7700 AND WAS ABLE TO TELL THE CTLR MY SIT AND WHERE I WAS LOCATED. HE SAID TO CALL BACK WHEN I REACHED THE FIELD AND THAT HE WOULD SEND FIRE AND AMBULANCE VEHICLES JUST IN CASE. I CIRCLED THE LNDG SITE ONCE AND LANDED IT. AFTER LNDG ON THE DUSTER STRIP WITH NO COMPLICATIONS I RPTED BACK ON 121.5 THAT WE WERE ON THE GND WITH NO FIRE AND NO INJURIES. LATER THE FLT SCHOOL FIXED THE CYLINDER AND FLEW THE ACFT BACK TO HNL.
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.