Service difficulty report · Fan · Boeing 76734AF

Difficulty date
June 14, 2021
Submitted
June 21, 2021
Operation
Air carrier
Aircraft
N312UP
Make and model
Boeing 76734AF
Aircraft serial
27763
Aircraft time
63,614 hours, 21,162 cycles
Engine
Ge CF680C2B7F
Part
Fan
Condition
Out Of Balance
Location
Lt Engine
Stage of operation
CL
How discovered
O
Nature of condition
E, J
Precautionary procedure
O

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

What was found

ATB NO EMERG DCLD-NO EMERG EQUIP USED-LANDED UNEVENTFLY-AC OOS** DURING CL/OUT VIB ON LH ENG IND FAN 3.3 & INCREASED TO 4.0 AVER 3.5 3.7 @ CRZ VIB STEADY @ 1.9-2.0 DURING PWR REDUCT, INCRSD TO 3.5 REQ ATB TO MIA. PERF AVM BITE LH ENG, WGTS AVM BOX INCORR, PUT IN CORR WGTS MM 72 31 00 PERFOR VIB SURV FAN=3.1@72% MM71-00-00 D747231ACCOMPLISHED FAN TRIM BALANCE PER MM 72-31-00. ACCOMPLISHED VIBE SURVEY TEST NUMBER 6 PER MM 71-00-00, N1 FAN VIBES AT 0.8 UNITS.

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