SDR 2008UALA03513

Service difficulty report · Gearbox · Boeing 777222

Difficulty date: June 21, 2008
Submitted: July 1, 2008
Operation: Air carrier
Aircraft: N798UA
Make and model: Boeing 777222
Aircraft serial: 26928
Aircraft time: 44,828 hours, 6,747 cycles
Engine: Pwa PW40903
Engine time: 43,661 hours, 6,574 cycles
System (JASC): 8300 · Accessory Gearboxes
Part: Gearbox
Condition: Making Metal
Location: Nr 2 Engine
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

FOUND METAL ON NR 2 ENGINE MAIN GEAR BOX CHIP DETECTOR. ENGINE REMOVED. SHOP TEARDOWN REVEALED THAT MAIN GEARBOX MB7 BEARING HAD FAILED. ALL RELEVANT HARDWARE WAS RETURNED TO MANUFACTURER FOR FURTHER ANALYSIS. THIS IS AN ONGOING PROBLEM THAT MANUFACTURER IS ACTIVELY INVESTIGATING.