SDR UALA2011092105108

Service difficulty report · Line · Boeing 757222

Difficulty date: September 20, 2011
Submitted: October 3, 2011
Operation: Air carrier
Aircraft: N549UA
Make and model: Boeing 757222
Aircraft serial: 25397
Aircraft time: 75,001 hours, 21,659 cycles
Engine: Pwa PW2037
System (JASC): 2910 · Hydraulic System, Main
Part: Line
Condition: Leaking
Location: Hyd System
Stage of operation: IN
How discovered: V
Nature of condition: K
Precautionary procedure: K

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

What was found

HYD LEAK OUTBOARD LEFT WING. OPENED ALL LOWER WING ACCESS PANELS FROM OUTBOARD AILERON INBOARD. UNABLE TO FIND ANY LEAKAGE WITH SYSTEM PRESSURIZED. LEAKAGE APPEARS WITH PRESSURE OFF SYSTEM, BUT UNABLE TO DETERMINE EXACT LOCATION OF LEAK. LEAKAGE RATE DOES NOT EXCEED 1 DROP PER MINUTE. FOUND OUTBOARD PCU RETURN LINE UNION LOOSE AT INBOARD RIB. SECURED AND RAN ALL HYD SYSTEMS AND CYCLED AILERON SEVERAL TIMES. NO LEAKS NOTED AFTER SETTING 2H.