Service difficulty report · Pump · Boeing 767322

Difficulty date
December 8, 2022
Submitted
December 9, 2022
Operation
Air carrier
Aircraft
N657UA
Make and model
Boeing 767322
Aircraft serial
27112
Aircraft time
115,540 hours, 17,894 cycles
Part
Pump
Condition
Failed
Location
Hyd System
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
B, A

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

What was found

SUSPECT LEFT ENGINE DRIVEN HYDRAULIC PUMP FAILURE. PUMP REPLACEMENT REQUIRED. REPLACED LEFT EDP PUMP ASSY IAW AMM 29-11-05-404-029-005 AND PUMP FAILED OPERATIONAL TEST. PERFORMED FIM 29-11 FAULT TREE 805 AND PER SHEET 2 BLOCK 27, SWAPPED OPERATIONAL PRESSURIZATION SHUTOFF ENGINE GROUND IDLE RUN TEST NR 3 IAW AMM 71-00-00-795-003-N00 VALVE FROM RIGHT SYSTEM INTO LEFT POSITION AND DRY MOTOR PERFORMED. EDP OPERATED AND SUPPLIED 2840PSI AT MAX MOTOR. LEFT EDP ASSY REPLACED REF AMM 29-11-05-004-001-005 AND AMM RIGHT SYS RESERVOIR PRESSURIZATION SHUTOFF VALVE REINSTALLED IN 29-11-05-404-029-005. PERFORMED ENGINE DRY MOTOR TEST NR 2 REF ORIGINAL POSITION. PERFORMED FIM PRESSURIZATION SHUTOFF VALVE REPLACEMENT.