SDR IPXA2018010725176

Service difficulty report · Fan · Boeing 76734AF

Difficulty date: January 5, 2018
Submitted: January 8, 2018
Operation: Air carrier
Aircraft: N343UP
Make and model: Boeing 76734AF
Aircraft serial: 37945
Aircraft time: 16,254 hours, 5,792 cycles
Engine: Ge CF680C2B6F
System (JASC): 7220 · Turbine Engine Air Inlet Section
Part: Fan
Condition: Vibration
Location: Nr 1 Engine
Stage of operation: CL
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

AIR TURNBACK, DURING CLIMB OUT, NR 1 ENGINE FAN VIBRATION REACHED 5.0 DURING CRUISE FLIGHT. WENT DOWN TO 1 DURING CRUISE. STEP CLIMB FROM FL 330 TO 370 THE NR 1 ENG FAN VIBRATION REACHED 5 AGAIN. PERFORM A FAN TRIM BALANCE IAW MM 72-31-00 755-199-HOO, FIM 71-05-00-856-HO1, RAN THE NR 1 ENGINE N1 AT 100 PERCENT 2 MAX, OPS WITHIN LIMITS.

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