Service difficulty report · Stator · Boeing 7673Y0

Difficulty date
May 21, 2009
Submitted
June 16, 2009
Operation
General aviation
Make and model
Boeing 7673Y0
Aircraft time
71,181 hours
Engine
Pwa PW4060
Part
Stator
Condition
Damaged
Location
Nr 1 Engine
Stage of operation
DE
How discovered
O
Nature of condition
Y, J
Precautionary procedure
A

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

What was found

(CAN) NR 1 ENGINE AUTO SHUTDOWN 125NM EST OF YYZ. AN EMERGENCY WAS DECLARED WITH ATC THE FLIGHT LANDED. STATUS MESSAGE: L ENG EEC C1 MAINT MSG ON ARRIVAL: L ENG EEC C1 L PIMU L NECEL VENT VLV, LT ENG STARTER REMOVED FOR ACCESS. N2 TRANSDUCER STATOR REMOVED, FOUND STATOR DAMAGED, SHAFT AND ROTOR WITH DAMAGE AND SIGNIFICANT PLAY. ALSO, PMA (PERMANENT MAGNET ASSY) WHICH PROVIDES POWER TO THE FADEC USES THE SAME SHAFT AS THE N2 XDUCER. THUS THE PMA STATOR/ROTOR DISINTEGRATED, AND IT IS SUSPECTED THAT THE CAUSE WAS BEARING FAILURE. WITHOUT POWER TO THE FADEC, THERE IS NOTHING TO KEEP THE FUEL METERING UNIT OPERATIONAL, AND THUS FUEL STARVATION WOULD HAVE CAUSED THE SHUTDOWN.

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