SDR FDEA201104261626

Service difficulty report · O-Ring · Doug MD1010F

Difficulty date: April 26, 2011
Submitted: April 26, 2011
Operation: Air carrier
Aircraft: N396FE
Make and model: Doug MD1010F
Aircraft serial: 46630
Aircraft time: 79,383 hours, 32,454 cycles
System (JASC): 2910 · Hydraulic System, Main
Part: O-Ring
Condition: Cut
Location: Hyd System
Stage of operation: DE
How discovered: O
Nature of condition: K
Precautionary procedure: O

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

What was found

HYD 3 ELEV OFF ALERT, HYD QUANTITY DECREASED AT 1GAL/30MIN HYD 3 QUANT LO AND HYD FAIL. ALTERNATE GEAR EXTENTION USED. UPON BLOCKED IN, HYD QUANTITY SHOWING :NR 1 = 7.1, NR 2 = 6.7 & NR 3 = 1.4 ; NR 3 RESERVOIR QTY POINTER SHOWING BELOW SERVICEABLE LEVEL. FOUND O-RING CUT AND PROTRUDING ON THE PRIMARY TRIM CONTROL VALVE. REPLACED O-RING IN REF TO AMM 27-43-03-4. LEAK AND OPS CHECKS GOOD. SERVICED HYDRO AND STOWED EMERGENCY GEAR EXTEND HANDLE. ACFT OK FOR SERVICE. FINAL CLOSED.

More about the Doug MD-10-10F