Service difficulty report · Propeller · Cessna 421C

Difficulty date
December 8, 2023
Submitted
February 13, 2024
Operation
General aviation
Aircraft
N146T
Make and model
Cessna 421C
Aircraft serial
421C0500
Aircraft time
5,017 hours, 2,500 cycles
Engine
Cont GTSIO520L
Engine time
1,166 hours, 350 cycles
Propeller
Hartzl HCC2Y*
Part
Propeller
Part number
HCC3YN2UF90
Part serial
54321
Condition
Overspeed
Location
Zone 600
Part time
1,166 hours, 350 cycles
Component
Propeller · Hartzl · 54321
Component part number
HCC3YN2UF90
Stage of operation
CL
How discovered
V
Nature of condition
Z
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

RIGHT PROP GOVERNOR FAILED APPROACHING LEVEL OFF FROM CLIMB. ENGINE SPIKED TO OVER 6,000 RPM, ENGINE RUINED, BROUGHT PROP CONTROL BACK TO NO AVAIL. THROTTLE BACK AND MIXTURE BACK TO GET ENGINE RPM DOWN. VISUAL PROP COMPLETELY ?AT, PROP WOULD NOT FEATHER, RIGHT ENGINE STILL RUNNING SOMEWHAT, TURNED TOWARDS HOME BASE (KACT) ?REWALLED LEFT ENGINE KEPT TRYING TO MAKE POWER WITH RIGHT ENGINE. CAME DOWN BETWEEN 1,500FPM AND 1,000 FPM ALL THE WAY TO THE GROUND. BELLY LANDED IN A CORN ?ELD A FEW MILES SHORT OF MACGREGOR AIRPORT. TIME FROM INITIAL RUNAWAY TO THE GROUND WAS 9 MINUTES AND 11,000 FEET.

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