SDR 2022F00429

Service difficulty report · Shaft · Cessna 750

Difficulty date
October 28, 2022
Submitted
October 28, 2022
Operation
General aviation
Aircraft
N750EA
Make and model
Cessna 750
Aircraft serial
7500188
Aircraft time
6,977 hours, 3,930 cycles
Engine
Rroyce AE3007C1
Engine time
6,891 hours, 3,849 cycles
Part
Shaft
Condition
Sheared
Location
Alternator
Component
Alternator
Component part number
99144354
Stage of operation
CR
How discovered
O
Nature of condition
K
Precautionary procedure
E

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

What was found

DURING A POSITIONING FLIGHT FROM KPNE TO KHPN, THE CREW EXPERIENCED AN ABNORMAL OIL INDICATION ON ENGINE NO. 1. THE CHECKLIST DIRECTED THE CREW TO SHUTDOWN THE ENGINE AS A PRECAUTIONARY ACTION. THE CREW ASSESSED THE PROBLEM, DECLARED AN EMERGENCY AND LANDED SAFELY IN KHPN. AFTER MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT AN INVESTIGATION OF THE NO. 1 ENGINE FOUND THAT THE ALTERNATOR HAS SHEARED ITS SHAFT AND THAT THE OIL VACATED THE ENGINE THROUGH THAT OPENING. A FADEC READING HAS BEEN DIRECTED TO BE ACCOMPLISHED AND THE FINDINGS WILL DETERMINE WHAT ACTION WILL BE TAKEN NEXT.

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