Service difficulty report · Pump · Bell 407

Difficulty date
November 10, 2020
Submitted
November 11, 2020
Operation
Air carrier
Aircraft
N409LM
Make and model
Bell 407
Aircraft serial
54621
Aircraft time
1,654 hours, 4,891 cycles
Engine
Allsn 250C47B
Engine time
1,379 hours, 3,912 cycles
Part
Pump
Part number
1C2710
Part serial
9BK424
Condition
Inoperative
Location
Fuel Boost
Part time
1,655 hours
Stage of operation
TO
How discovered
O
Nature of condition
J
Precautionary procedure
C

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

What was found

PILOT REPORTED FADEC DEGRADE AND THAT RT BOOST PUMP SWITCH WOULD NOT STAY IN THE ON POSITION. TROUBLESHOT PROBLEM AND FOUND THAT RT FUEL BOOST PUMP WAS INOPERABLE WHEN SWITCH WAS FLIPPED. OVERDRAW FROM THE FAILED PUMP CAUSED THE SWITCH TO FLIP FROM THE ON TO OFF POSITION AND CAUSED A FADEC DEGRADE CAS ALERT. REPLACED PUMP WITH REBUILT UNIT AND CLEARED FADEC FAULT. PERFORMED OPERATIONAL CHECK ON INSTALLED PUMP AND FOUND SERVICEABLE. GROUND RAN AIRCRAFT AND FOUND THAT THE CAS ALERT DID NOT RETURN.

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