|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : hnw|
|Altitude||msl bound lower : 9500|
msl bound upper : 9500
|Controlling Facilities||artcc : zoa|
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, Low Wing, 2 Eng, Retractable Gear|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 100|
flight time total : 2000
flight time type : 60
|Anomaly||aircraft equipment problem : less severe|
other anomaly other
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : overcame equipment problem|
none taken : anomaly accepted
|Air Traffic Incident||other|
Partial power loss experienced on left engine. Vibration noticed but not excessive. No loss of oil pressure or rise in oil temperature. Continued operation on affected engine to destination rhu approximately 30 mins en route. Aircraft was able to maintain altitude. I elected to not shut down and feather the affected engine because the partial power it produced seemed reliable to continue the flight. After disassembly of the cylinder affected discovery of a broken exhaust valve. The head of the exhaust valve was never found.
Original NASA ASRS Text
Title: PARTIAL POWER LOSS IN #1 ENGINE.
Narrative: PARTIAL PWR LOSS EXPERIENCED ON LEFT ENG. VIBRATION NOTICED BUT NOT EXCESSIVE. NO LOSS OF OIL PRESSURE OR RISE IN OIL TEMP. CONTINUED OPERATION ON AFFECTED ENG TO DEST RHU APPROX 30 MINS ENRTE. ACFT WAS ABLE TO MAINTAIN ALT. I ELECTED TO NOT SHUT DOWN AND FEATHER THE AFFECTED ENG BECAUSE THE PARTIAL PWR IT PRODUCED SEEMED RELIABLE TO CONTINUE THE FLT. AFTER DISASSEMBLY OF THE CYLINDER AFFECTED DISCOVERY OF A BROKEN EXHAUST VALVE. THE HEAD OF THE EXHAUST VALVE WAS NEVER FOUND.
Data retrieved from NASA's ASRS site as of August 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.