Service difficulty report · Stator · Boeing 777222

Difficulty date
February 22, 2004
Submitted
March 2, 2004
Operation
Air carrier
Aircraft
N774UA
Make and model
Boeing 777222
Aircraft serial
26936
Aircraft time
33,025 hours, 7,157 cycles
Engine
Pwa PW4077
Part
Stator
Condition
Misinstalled
Location
Apu
Stage of operation
NR
How discovered
O
Nature of condition
W, E, B
Precautionary procedure
O

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

What was found

INTERMITTENT ODOR AND HAZE IN CABIN. T2 STATOR ASSEMBLY OFTEN SUPPLIED BY THE VENDER AS COMPLETELY ASSEMBLED. SUBASSEMBLY HELD TOGETHER BY TWO WRAPS OF SAFETY WIRE FOR SHIPMENT. UNITED SHOP PROCEDURES DOES STATE TO REMOVE WIRE IF PRESENT (OEM CMM USED). UNITED APU SHOP MECHANICS MISSED REMOVING WIRE & DURING ENGINE OPERATION THE T2 BLADES GREW & HIT CONSTRAINED STATOR ASSEMBLY CAUSING HIGH VIBRATION & COMPRESSOR CARBON SEAL FAILURE WHICH RESULTED IN ODOR IN CABIN. JOB CARD WILL BE REVISED TO HAVE LEAD REMOVE ONE NOZZLE & CHECK FOR WIRE. OEM HAS BEEN CONTACTED TO USE ALTERNATIVE SHIPPING AIDE THAT WILL BURN AWAY AT INITIAL APU START. PREVENTING FAILURE.