|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : leb|
|Altitude||msl bound lower : 6000|
msl bound upper : 6000
|Operator||general aviation : instructional|
|Make Model Name||Small Aircraft, High Wing, 1 Eng, Fixed Gear|
|Flight Phase||cruise other|
|Route In Use||enroute airway : zbw|
|Function||instruction : instructor|
|Qualification||pilot : instrument|
pilot : commercial
pilot : cfi
|Experience||flight time last 90 days : 150|
flight time total : 1300
flight time type : 300
|Function||flight crew : single pilot|
|Qualification||pilot : private|
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : declared emergency|
While en route from ash-rut a power loss of 100-200 RPM occurred. Carburetor heat was applied but did not indicate ice build up. Engine surged +100-200 RPM then dropped again. After 2-3 occurrences within 2 mins, power dropped approximately 400 RPM. At my direction student asked for and received vectors for leb. Altitude was plentiful and we stayed high in the pattern. We brought the aircraft to the local FBO where the mechanic checked the plugs for fouling and gap, checked compression, fuel contamination, etc. Mechanic found sufficient fouling of the plugs to precipitate the power loss. We departed and had no further problems. Temperature and humidity were high and full power (and full rich mixture) was held for an extended period before reaching altitude. Perhaps if mixture were leaned somewhat during the climb, the fouling would not have been as bad. Student and CFI were collected throughout the ordeal.
Original NASA ASRS Text
Title: INFLT ENGINE PROBLEM, LOSS OF RPM. VECTORS TO LNDG.
Narrative: WHILE ENRTE FROM ASH-RUT A PWR LOSS OF 100-200 RPM OCCURRED. CARB HEAT WAS APPLIED BUT DID NOT INDICATE ICE BUILD UP. ENG SURGED +100-200 RPM THEN DROPPED AGAIN. AFTER 2-3 OCCURRENCES WITHIN 2 MINS, PWR DROPPED APPROX 400 RPM. AT MY DIRECTION STUDENT ASKED FOR AND RECEIVED VECTORS FOR LEB. ALT WAS PLENTIFUL AND WE STAYED HIGH IN THE PATTERN. WE BROUGHT THE ACFT TO THE LCL FBO WHERE THE MECH CHKED THE PLUGS FOR FOULING AND GAP, CHKED COMPRESSION, FUEL CONTAMINATION, ETC. MECH FOUND SUFFICIENT FOULING OF THE PLUGS TO PRECIPITATE THE PWR LOSS. WE DEPARTED AND HAD NO FURTHER PROBS. TEMP AND HUMIDITY WERE HIGH AND FULL PWR (AND FULL RICH MIXTURE) WAS HELD FOR AN EXTENDED PERIOD BEFORE REACHING ALT. PERHAPS IF MIXTURE WERE LEANED SOMEWHAT DURING THE CLB, THE FOULING WOULD NOT HAVE BEEN AS BAD. STUDENT AND CFI WERE COLLECTED THROUGHOUT THE ORDEAL.
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.