SDR UALA2010050601543

Service difficulty report · Tube · Boeing 777222

Difficulty date: May 6, 2010
Submitted: May 7, 2010
Operation: Air carrier
Aircraft: N218UA
Make and model: Boeing 777222
Aircraft serial: 30222
Aircraft time: 38,102 hours, 4,696 cycles
Engine: Pwa PW4090
Engine time: 48,395 hours, 6,844 cycles
System (JASC): 7261 · Turbine Engine Oil System
Part: Tube
Condition: Coked
Location: Nr 1 Beather
Stage of operation: IN
How discovered: 9
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

NR 1 ENG HAS SEVERE COKING AROUND THE NR 3 BEARING BREATHER TUBE. PERFORM BORESCOPE INSP OF NR 3 BEARING WEEP (VENT) TUBE REF MM. NR 1 ENGINE BORESCOPE INSP OF NR 3 BEARING BREATHER TUBE LB3, NO SIGNS OF COKING. ACP BORESCOPE OF NR 3 BEARING WEEP TUBE, NO BLOCKAGE AND NO OIL WETTING IN TUBE OR NR 3 BEARING COMPARTMENT. NR 1 ENGINE HAS NR 3 BRG SCAVENGE BREATHER LINE DISCONNECTED AND B NUT REMOVED. INSTALLED B-NUT RAN ENGINE, NO LEAKS NOTED.