Service difficulty report · Hydraulic System · Boeing 747451

Difficulty date
December 31, 2004
Submitted
January 11, 2005
Operation
Air carrier
Aircraft
N105UA
Make and model
Boeing 747451
Aircraft serial
26473
Aircraft time
42,450 hours, 5,255 cycles
Engine
Pwa PW4056
Part
Hydraulic System
Condition
Leaking
Location
Nr 2
Stage of operation
NR
How discovered
9
Nature of condition
K
Precautionary procedure
O

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

What was found

FLIGHT LOST ALL QUANTITY IN THE NR 2 HYD SYS. LOSS OF FLUID DUE TO CHAFED THRUST REVERSER RETURN HYDRAULIC LINE. MAINTENANCE ALSO NOTED LEAK AT PUMP FLANGE. LEAK AT PUMP FLANGE POSSIBLY DUE TO PUMP FAILURE DUE TO SUBSEQUENT FLUID STARVATION. SYDMM ACCOMPLISHED PERMASWAGE REPAIR OF DAMAGED LINE. NO ADDITIONAL HYD PUMP INFORMATION AVAILABLE FROM OSV AT THIS TIME.