SDR HEEA0012117

Service difficulty report · Transmission · Bolkms BO105S

Difficulty date: November 19, 1997
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N724MB
Make and model: Bolkms BO105S
Aircraft serial: S756
System (JASC): 6320 · Main Rotor Gearbox
Part: Transmission
Part number: 4638001004
Condition: Spalled
Location: M/R Gr Box
Part time: 3,392 hours
Stage of operation: IN
Nature of condition: O
Precautionary procedure: K

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

What was found

TRANSMISSION BEVEL GEARS HAVE EXCESSIVE SPALLING ON S/N 2195 AND MINOR ON S/N 2310 T.T. 3392:45 (TOOTH FAILURE) PINION S/N 3142, T.T. 353:20 SPALLING ON TOOTH (ROOT AREA) EXCESSIVE DENTS ON BEARINGS 2 EACH 4638303081, T.T. UNKNOWN AND 1 EACH 4638302025, S/NNR3089, T.T. UNKNOWN AND 1 EACH 4638302023, S/N 2353, T.T. 353:20 AND 1 EACH 4619303085, T.T. UNKNOWN. REPLACED WITH SERVICEABLE PARTS.