20000323040219I

Incident

FAA incident report · Cessna 172S · Ruston, LA · March 23, 2000

Date: March 23, 2000 · 13:00 local
Place: Ruston, LA
Airport: Ruston Municipal Airport
Phase of flight: Takeoff Ground Roll
Operating rules: General operating rules (Part 91)
Operator: GP8S
Aircraft: N434SP
Reported as: Cessna 172S
Reported engine: Lycoming IO360L2A
Fatal injuries: 0

N434SPRegistered now · Cessna 172SS/N 172S8302 · Built 1999 Airframe modelCessna 172S Engine modelLycoming I0360 seriesReciprocating

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(-23) On March 23, 2001, at 1300 CST, Cessna 172S, N434SP, experienced an abnormal idle mixture RPM increase during pre-takeoff checks. The aircraft is owned by la. Tech university. The pilot stated that during the pre-takeoff check, the engine idle speed indicated 650 RPM at the hard idle stop position, and the idle/mixture leaning check resulted in an increase of 150 rpms. Due to the 150 RPM increase, the pilot aborted takeoff. According to the Lycoming IO-360 series idle speed and mixture check, an increase of more than 50 RPM while leaning out the mixture indicates an excessive rich idle mixture. Due to the additional occurrences (N980SP--FTW01LA062 and N566SP--FTW01SL088) involving a rich mixture setting with the lyc. IO-360 engine, the fuel distribution system was removed for further examination.

As the FAA filed it

(-23) ON MARCH 23, 2001, AT 1300 CST, CESSNA 172S, N434SP, EXPERIENCED AN ABNORMAL IDLE MIXTURE RPM INCREASE DURING PRE-TAKEOFF CHECKS. THE AIRCRAFT IS OWNED BY LA. TECH UNIVERSITY. THE PILOT STATED THAT DURING THE PRE-TAKEOFF CHECK, THE ENGINE IDLE SPEED INDICATED 650 RPM AT THE HARD IDLE STOP POSITION, AND THE IDLE/MIXTURE LEANING CHECK RESULTED IN AN INCREASE OF 150 RPMS. DUE TO THE 150 RPM INCREASE, THE PILOT ABORTED TAKEOFF. ACCORDING TO THE LYCOMING IO-360 SERIES IDLE SPEED AND MIXTURE CHECK, AN INCREASE OF MORE THAN 50 RPM WHILE LEANING OUT THE MIXTURE INDICATES AN EXCESSIVE RICH IDLE MIXTURE. DUE TO THE ADDITIONAL OCCURRENCES (N980SP--FTW01LA062 AND N566SP--FTW01SL088) INVOLVING A RICH MIXTURE SETTING WITH THE LYC. IO-360 ENGINE, THE FUEL DISTRIBUTION SYSTEM WAS REMOVED FOR FURTHER EXAMINATION.