SDR 2003UALA00449

Service difficulty report · Fitting · Boeing 737522

Difficulty date: May 24, 2003
Submitted: June 3, 2003
Operation: Air carrier
Aircraft: N901UA
Make and model: Boeing 737522
Aircraft serial: 25001
Aircraft time: 35,371 hours, 22,870 cycles
Engine: Ge CFM56*
System (JASC): 2910 · Hydraulic System, Main
Part: Fitting
Condition: Leaking
Location: Hyd System
Stage of operation: CR
How discovered: O
Nature of condition: K, J
Precautionary procedure: A, H

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

What was found

B-HYDRAULIC SYSTEM QUANTITY AND PUMP LOW PRESSURE LIGHTS ILLUMINATED. INSPECTION FOUND THAT THE RETURN LINE CHECK VALVE FITTING ON THE HYDRAULIC FLAP DRIVE MOTOR SHEARED OFF AT THE BOSS. THE FITTING WAS REPLACED. THE HYDRAULIC SYSTEM WAS SERVICED AND THE FILTERS WERE CHANGED. OPERATIONAL CHECKS OF ALL PUMPS ASSOCIATED WITH SYSTEM 'B' AND NR 2 ENGINE RUN WAS ACCOMPLISHED TO VERIFY 'B' SYSTEM HYDRAULICS OPERATE NORMALLY.