The following information is derived from the FAA's Service Difficulty Reports and Aviation Maintenance Alerts.


Cessna 402B Businessliner

Oil Seal Failure

During descent into the destination, the pilot could see oil streaking back from top cowl louvers and oil pressure began dropping. Pilot shut down engine and feathered prop. Landed without issue. Maintenance found oil aft of the accessory gearbox, appearing to be from around the turbo area. Further investigation revealed oil bypassing the turbocharger seals.

Part total time: Unknown

Cessna 402C Businessliner

Unknown Failure

Right engine experienced steady loss of MAP in cruise with corresponding decrease in oil pressure. Engine was shut down and secured, pilot diverted. Inspection revealed right engine turbocharger at fault. Replaced turbocharger, inspected engine and components for additional defects, and verified engine produces rated MAP and does not leak oil.

Part total time: 2378.0 hours

Diamond DA40 Diamond Star

Cracked Bearing Flange

During phase inspection, the turbocharger bearing flange was found cracked in two places. Exhaust gas was jetting over the top of the turbocharger. Other, similar failures have been found in our fleet as well.

Part total time: 101.0 hours

Diamond DA42 Twin Star

Turbocharger Oil Leak

Low oil pressure in right engine was observed, followed by oil odor in cabin. Engine was shut down and an uneventful emergency landing performed. Inspection revealed the right engine’s turbocharger failed, causing the oil loss.

Part total time: 601.0 hours

Piper PA-31-350 Navajo Chieftain

Seized Turbocharger

Crew notified maintenance that right engine was burning oil and not developing full power. Inspection revealed turbocharger had seized. Turbocharger replaced, and ground run revealed no further defects. Turbocharger was sent out for overhaul.

Part total time: Unknown

Piper PA-32RT-300T Turbo Lance II

Main Bearing Failure

Turbocharger failed due to main bearing failure. Turbocharger froze and blocked air to the induction system. Pilot did not execute checklist procedures to select alternate air source, resulting in off-airport landing.

Part total time: Unknown

Piper PA-46-350P Malibu Mirage

Turbine Seized

Pilot reported loss of power, followed by pressurization loss during climb. Engine ran well, but power was limited to 19 in. Hg MAP instead of 35 in. prior to the event. Discovered turbine on right turbocharger had seized. Unable to determine cause of failure.

Part total time: 837.0 hours


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