Service difficulty report · Pump · Boeing 747451

Difficulty date
January 16, 2011
Submitted
January 19, 2011
Operation
Air carrier
Aircraft
N663US
Make and model
Boeing 747451
Aircraft serial
23818
Aircraft time
91,710 hours, 11,965 cycles
Part
Pump
Condition
Overheated
Location
Hyd System
Stage of operation
CR
How discovered
O
Nature of condition
M, J
Precautionary procedure
A

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

What was found

DIVERTED DUE TO NR 4 ENG EDP OVERHEAT. THE EDP WAS PUT ON MEL OUT. THE FLIGHT CREWS SHUTDOWN THE NR 4 ENGINE DUE TO THE HYD TEMP CONTINUING TO RISE ON THE NR 4 HYD SYS. MX INSPECTED THE CASE DRAIN FILTERS WITH NO FINDINGS. THE EDP, CASE DRAIN FILTERS, AND TEMP SENSOR WERE REPLACED. THE ENG WAS RUN FOR AN HR WITH NO FURTHER PROBLEMS.