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A grumman AA5 in cruise at 3500 ft experienced violent engine vibration and loss of power. Made off field landing with no injuries. Damaged propeller and nose gear.
| Attributes | |
| ACN | 718425 |
| Time | |
| Date | 200611 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | general aviation : personal |
| Make Model Name | Tiger (F11) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | None |
| Person 1 | |
| Affiliation | other |
| Function | observation : passenger |
| Qualification | pilot : multi engine pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 80 flight time total : 15800 flight time type : 200 |
| ASRS Report | 718425 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | aircraft equipment problem : critical ground encounters other |
| Independent Detector | aircraft equipment other aircraft equipment : engine indications other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Departed at XA30 am after filling aircraft with fuel and oil on a pleasure trip. After approximately 20 mins into flight engine started to vibrate violently. At the time of the occurrence the owner of the airplane was PIC. When the incident occurred I took control of the aircraft and made a successful off field landing. There were no injuries and damage to aircraft was to propeller; engine and nose gear. I took control of aircraft as I was a higher time pilot with more experience in type. After discussion with mechanic who maintains aircraft he believes it to be a valve failure. Prevention of reoccurrence would be not to fly engines past tbo (time before overhaul).
Original NASA ASRS Text
Title: A GRUMMAN AA5 IN CRUISE AT 3500 FT EXPERIENCED VIOLENT ENG VIBRATION AND LOSS OF PWR. MADE OFF FIELD LNDG WITH NO INJURIES. DAMAGED PROP AND NOSE GEAR.
Narrative: DEPARTED AT XA30 AM AFTER FILLING ACFT WITH FUEL AND OIL ON A PLEASURE TRIP. AFTER APPROX 20 MINS INTO FLT ENG STARTED TO VIBRATE VIOLENTLY. AT THE TIME OF THE OCCURRENCE THE OWNER OF THE AIRPLANE WAS PIC. WHEN THE INCIDENT OCCURRED I TOOK CTL OF THE ACFT AND MADE A SUCCESSFUL OFF FIELD LNDG. THERE WERE NO INJURIES AND DAMAGE TO ACFT WAS TO PROP; ENG AND NOSE GEAR. I TOOK CTL OF ACFT AS I WAS A HIGHER TIME PLT WITH MORE EXPERIENCE IN TYPE. AFTER DISCUSSION WITH MECH WHO MAINTAINS ACFT HE BELIEVES IT TO BE A VALVE FAILURE. PREVENTION OF REOCCURRENCE WOULD BE NOT TO FLY ENGS PAST TBO (TIME BEFORE OVERHAUL).
Data retrieved from NASA's ASRS site as of January 2009 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.