Service difficulty report · Tube · Boeing 747422

Difficulty date
February 19, 2000
Submitted
October 4, 2000
Operation
Air carrier
Aircraft
N174UA
Make and model
Boeing 747422
Aircraft serial
24381
Aircraft time
41,572 hours, 4,466 cycles
Engine
Pwa PW4056
Engine time
30,927 hours, 30,927 cycles
Part
Tube
Part number
51L332
Condition
Cracked
Location
Bearing Oil
Stage of operation
CR
How discovered
O
Nature of condition
K, J
Precautionary procedure
E, A

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

What was found

ENGINE NUMBER TWO OIL QUANT ZERO, OIL PRESSURE DECREASING. SHUT DOWN NR 2WITH 73 PSI. WINDMILL OIL PRESS 15-16 PSI. NR 2 ENGINE IN FLIGHT SHUT DOWN DUE TO LOSS OF OIL PRESSURE AND OIL QTY. ENGINE WILL REQUIRE REMOVAL. OIL LOSS WAS CAUSED BY A CRACKED NUMBER 4 BEARING OIL TUBE. SUBSEQUENT BORESCOPE REVEALED 1 HPT T2 BLADE FAILED AT MID SPAN. RESULTANT VIBRATION CAUSED THE OIL LINE FRACTURE.