Service difficulty report · Bolt · Boeing 777*

Difficulty date
June 12, 2019
Submitted
June 14, 2019
Operation
General aviation
Make and model
Boeing 777*
Engine
Ge GE90115B
Part
Bolt
Part number
J334P12A
Condition
Worn
Location
Engine
Part time
39,390 hours, 3,920 cycles
Stage of operation
IN
How discovered
V
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

WHEN THE ENGINE WAS GOING THROUGH ITS INSPECTION PROCESS, ALL THE BOLTS GOING THROUGH THE STAGE ONE NOZZLE SUPPORT INTO THE COMBUSTION CHAMBER WERE FOUND LOOSE AND WORN. TYPICALLY THE BOLTS ARE TIGHT AND OFTEN SHEAR WHEN DISASSEMBLY IS ATTEMPTED. LOOSE BOLTS ARE NOTED OCCASIONALLY. TO HAVE THE WHOLE SET LOOSE IS UNUSUAL. INVESTIGATING TO CONFIRM IF THERE HAS BEEN MAINTENANCE COMPLETED IN THIS AREA OR IF THIS IS FROM NEW MANUFACTURE.