Service difficulty report · Pump · Skrsky S92A

Difficulty date
November 15, 2014
Submitted
March 12, 2015
Operation
General aviation
Make and model
Skrsky S92A
Aircraft time
2,455 hours
Engine
Ge CT78A
Part
Pump
Part number
9235115800104
Condition
Malfunctioned
Location
M/R Gearbox Lube
Part time
4,108 hours
Stage of operation
NR
How discovered
9
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

(CAN) UPON REMOVAL OF ONE OF THE MAIN GEARBOX LUBE PUMPS FOR VESPEL SPLINE REPLACEMENT, IT WAS DISCOVERED THAT ONE OF THE MOUNTING FLANGE EARS FOR THE PUMP WAS CRACKED COMPLETELY OFF. THIS HAS OCCURRED ELSEWHERE IN THE S92 FLEET SEVERAL TIMES ALREADY AND A RETAINER HAS SINCE BEEN DEVELOPED TO SECURE THE PUMP WHEN THIS OCCURS. HOWEVER THIS STILL CONSTITUTES A PUMP REPLACEMENT OF COURSE. THE REPEATED REMOVALS AND INSTALLATIONS OF THIS COMPONENT FOR VESPAL SPLINE REPLACEMENTS COULD BE A MAIN CONTRIBUTOR OF CAUSE AS THE FLANGE EARS ALSO CONTAIN THREADED HOLES WHICH ACCOMMODATE JACKING BOLTS FOR PUMP REMOVAL WHICH IN TURN APPLIES STRAIN ON THE FLANGE EARS.