SDR ASMF202011005

Service difficulty report · Packing · Boeing 7378Z9

Difficulty date: September 21, 2020
Submitted: November 24, 2020
Operation: Air carrier
Aircraft: N342AM
Make and model: Boeing 7378Z9
Aircraft serial: 34262
Aircraft time: 48,275 hours, 21,145 cycles
System (JASC): 2910 · Hydraulic System, Main
Part: Packing
Part number: NAS16128A
Part serial: SS
Condition: Damaged
Location: Hyd System
Part time: 48,275 hours, 21,145 cycles
Stage of operation: IN
How discovered: 9
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

DURING TRANSIT CHECK, A HYDRAULIC LEAKAGE WAS DETECTED ON FLAP CONTROL VALVE. MAINTENANCE PERSONNEL PERFORMED REVISION, DETECTING PACKING´S OF HYDRAULIC LINES OF FLAP CONTROL VALVE WITH LEAKAGE. SO THE PACKING´S OF HYDRAULIC LINES P/N NAS1612-8A, MANUFACTURER BOEING COMPANY WAS REPLACED, IAW AMM 27-51-65/400, TESTED CORRECT.

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