SDR 2024F00312

Service difficulty report · Gearbox · Boeing 737

Difficulty date
December 9, 2024
Submitted
December 9, 2024
Operation
General aviation
Make and model
Boeing 737
Engine
Cfmint CFM567B20
Part
Gearbox
Part number
3400465090
Part serial
WQ9017
Condition
Damaged
Location
Accessory
Part time
40,738 hours, 24,888 cycles
Stage of operation
IN
How discovered
O
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

ON 2024-11-26, DURING THE DISASSEMBLY OF, IT WAS DISCOVERED THAT THREE 'TEN-POINTS NUTS' WHERE MISSING ON LINE 4, ON THE COVER SIDE (P/N J626P04). CONSEQUENTLY, THE OIL RETAINING RING WAS NOT FIXED INTO POSITION. PIECES OF IT WERE TORN OFF AND FOUND AT THE BOTTOM OF THE AGB.