Service difficulty report · Engine · Boeing 777222

Difficulty date
May 22, 2008
Submitted
May 27, 2008
Operation
Air carrier
Aircraft
N224UA
Make and model
Boeing 777222
Aircraft serial
30225
Aircraft time
24,796 hours, 3,171 cycles
Engine
Pwa PW4090
Engine time
24,105 hours, 3,277 cycles
Part
Engine
Condition
Contaminated
Location
Nr 1
Stage of operation
IN
How discovered
O
Nature of condition
W
Precautionary procedure
O

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

What was found

EVIDENCE OF METAL CONTAMINATION FOUND ON NR 1 ENG. METAL ON THE FORWARD MAGNETIC CHIP DETECTOR (MCD. ENGINE REMOVED PRIOR TO FURTHER FLIGHT. TEARDOWN FOUND THAT THE NR 2 BEARING HAD 3 BALLS WITH SPALLATION APPROXIMATELY 1/4-INCH TO 1/2-INCH IN SIZE. THE OUTER RACE ALSO HAD EXTENSIVE PITTING WHERE LIBERATED SPALL MATERIAL HAD GOTTEN BETWEEN THE BALLS AND THE RACE. THERE WAS NO COLLATERAL DAMAGE TO ANY OTHER NEARBY PARTS.