SDR FDEA2020082091933

Service difficulty report · B-Nut · Doug MD11F

Difficulty date: August 19, 2020
Submitted: August 20, 2020
Operation: Air carrier
Aircraft: N602FE
Make and model: Doug MD11F
Aircraft serial: 48402
Aircraft time: 88,148 hours, 22,265 cycles
System (JASC): 2910 · Hydraulic System, Main
Part: B-Nut
Condition: Leaking
Location: Hyd System
Stage of operation: CR
How discovered: V
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 1 OFF LEVEL 1 ALERT 15 MIN INTO CRUISE AT FL380. HYD 1 QTY LO AND HYD 1 PUMP 1R/1L OFF ALERTS CYCLED DURING CONFIGURATION. EMERGENCY DECLARED. SERVICED SYSTEM 1 HYDRAULIC RESERVOIR REF AMM 12-13-02-3. OPERATED NR 1 HYDRAULIC SYSTEM. TRACED LEAK TO LOOSE HYDRAULIC LINE B-NUT ON NR 1 BRAKE SYSTEM UPPER FWD ACCUMULATOR. SECURED THE FITTING IAW AMM 32-44-01-4. SERVICED AND OPERATED THE BRAKES IAW AMM 32-43-20-6. BRAKES OPERATED NORMALLY, WITH NO LEAKS NOTED. AIRCRAFT OK FOR SERVICE.

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