Service difficulty report · Gearbox · Bolkms BK117C2

Difficulty date
May 22, 2017
Submitted
May 22, 2017
Operation
General aviation
Make and model
Bolkms BK117C2
Part
Gearbox
Part number
4639003009
Part serial
1221
Condition
Cracked
Location
Tail Rotor
Part time
1,015 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

WHILE DOING A ROUTINE POST FLIGHT INSPECTION, THE TAIL ROTOR GEARBOX WAS FOUND TO BE LEAKING FLUID. AFTER CLEANING THE FLUID THE TAIL ROTOR GEARBOX HAD A 2.5 INCH CRACK. THIS GEARBOX IS INSTALLED ON A UH72A MILITARY VERSION OF THE EC145.