Service difficulty report · Contactor · Emb EMB505

Difficulty date
November 10, 2025
Submitted
November 13, 2025
Operation
Air carrier
Aircraft
N343QS
Make and model
Emb EMB505
Aircraft serial
50500194
Aircraft time
10,670 hours, 8,811 cycles
Part
Contactor
Part number
SM400D1171
Condition
Faulted
Location
Zone 400
Stage of operation
AP
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

REPEAT WRITE UP ON APPROACH TO LANDING IN KYIP WE RECEIVED GEN 1 OFF BUS YELLOW CAS ACCOMPANIED BY SHED BUS OFF. PLACED GEN 1 SWITCH IN OFF POSITION PER QRH DUE TO THE SHORT DURATION OF FLIGHT REMAINING. PLEASE NOTE THAT N1 FOR THE SAME RESPECTIVE THROTTLE POSITION APPEARS TO DOFFER BY APPROXIMATELY 1% POWERED ACFT & STARTED 2 ENG TO IDLE WITH NO DEFECTS. STARTED NR 1 ENG TO IDLE, NO DEFECTS CYCLED NR 1 GEN TO OFF & BACK TO AUTO. AFTER SWITCHING GEN 1 TO AUTO GEN 1 DID NOT COME BACK ON LINE. SHUT DOWN NR 1 ENG & ATTEMPTED TO RESTART, ENG WOULD NOT ROTATE & RECEIVED NO FAULTS, POWERED DOWN ACFT & POWERED UP. STARTED NR 2 ENG TO IDLE & ON STARTING NR 1 ENG TO IDLE NOTED GEN 1 OFF BUSS CASS. SHUTDOWN DOWN NR 1 ENG & ON TRYING TO RESTART, NOTED NO ENG ROTATION & NO FAULTS. ACCESSED DISTRIBUTION BOXES & COMPLETED GVI, NO DEFECTS .ACCESSED LT STARTER /GEN BRUSHES & COMPLETED DIMENSIONAL CHK, NO DEFECTS, REPOSITIONED LT/RT STARTER/GEN & COMPLETED ENG STARTS TO IDLE & ISSUES STAYED ON NR 1 SIDE. REPOSITIONED STARTER GENS TO ORIGINAL POSITIONS & CLOSED ACCESS . ON SECURING RT ENG LOWER COWLING, NOTED FWD UPPER LIVE LOCK PIN ON LOCK STOPPER WOULD NOT SCREW INTO LIVE LOCK . LIVE LOCK RECEPTACLE CORRODED WITH THREADS BARELY VISIBLE . ACCESSED TO GLC 1 K0010 & GLC 2 K0016, REPOSITIONED, STARTED NR 1 ENG TO IDLE, NO DEFECTS. STARTED NR 2 ENG & ON REACHING IDLE NOTED GEN 2 OFF BUSS CASS MESSAGE. SHUTDOWN NR 2 ENG & ATTEMPTED TO RESTART WITH NO ROTATION & NO FAULTS . POWERED DOWN ACFT & REPOSITIONED GLC 1 & 2 TO ORIGINAL POSITIONS. R & R GLC 1 K0010 WITH A NEW UNIT. OPS CHKD GOOD, NO DEFECTS. WORK COMPLETED IAW AMM 24-31-01, 24-31-03 & FIM 24-31-00-810-803-A. ORIGINAL SUBMISSION DATE: 11/11/2025

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