Service difficulty report · Engine · Beech 99

Difficulty date
November 17, 2021
Submitted
December 6, 2021
Operation
Air carrier
Aircraft
N399CZ
Make and model
Beech 99
Aircraft serial
U91
Aircraft time
31,801 hours, 43,530 cycles
Engine
Pwa PT6A28
Engine time
6,344 hours, 7,388 cycles
Propeller
Hartzl HCB4TN3
Part
Engine
Part number
PT6A28
Part serial
PCE51404
Condition
Failed
Location
Zone 600
Part time
6,344 hours, 7,388 cycles
Component
Pt Blade · Pwc · NA
Component part number
3013102
Stage of operation
TO
How discovered
V
Nature of condition
G, K
Precautionary procedure
C

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

What was found

PILOT REPORTS "RH ENGINE SN PC-51404 FAILURE ON TAKEOFF ROLL. ALL ANNUNCIATORS WERE EXTINGUISHED AND ENGINE INSTRUMENTS IN THE GREEN. AS I BEGAN MY ROLLOUT AND BEFORE I COULD REACH THE DESIRED POWER SETTING, THERE WAS A POP FROM THE RH SIDE AND THE AIRPLANCE PULLED TO THE RIGHT. I IMMEDIATELY RETARTED THE THROTTLE AND CAME TO A STOP, WHERE I SAW THE RH WINDOW COVERED IN CLEARISH FLUID. ADVISED ATC OF ABORTED T/O AND THEY REQUESTED ME OFF THE ACTIVE RUNWAY AS AN AIRLINER WAS ON 3 MILE FINAL." MAINTENANCE, UPON INVESTIGATION OF AIRCRAFT IT WAS DETERMED THERE WAS A MISSING POWER TURBINE BLADE FROM FIR TREE, A FEW BROKEN BLADES (APPROX 1/2 MISSING) AND BENT BLADES ON THE PT DISK. IT IS SUSPECTED EITHER PT BLADE FAILURE OR GEAR REDUCTION FAILURE CAUSED THIS EVENT.

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