Service difficulty report · Pump · Boeing 73776N

Difficulty date
November 20, 2010
Submitted
March 15, 2011
Operation
Air carrier
Make and model
Boeing 73776N
Aircraft time
29,003 hours
Engine
Ge CFM567B24
Part
Pump
Part number
5718610
Condition
Overheated
Location
Hyd System
Part time
20,337 hours
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

PILOT REPORTED THAT THE OVERHEAT LIGHT FOR ELEC 1 HYDRAULIC PUMP CAME ON IN CRUISE FOLLOWED 10 MINUTES LATER BY THE LOW PRESSURE LIGHT ILLUMINATING. PRESSURE WAS OBSERVED TO BE APPROX 1200 PSI AT THIS TIME. AIRCRAFT RETURNED TO YYC. MAINTENANCE CARRIED OUT FIM TASK 29-30 TASK 806 AND CONFIRMED ELEC 1 PUMP WAS U/S. METAL WAS FOUND IN CASE DRAIN FILTER, METAL CONTAMINATION CHECK CARRIED OUT AS PER AMM 29-11-41 PAGE 413. HYD B SYSTEM FLUSHED. ELEC 1 PUMP REPLACED IAW MM 29-11-21. SYSTEM CASE DRAIN FILTERS, PRESSURE MODULE FILTERS, AND RETURN FILTER FLUSHED AND REPLACED.

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