SDR ASAA2017071621392

Service difficulty report · Engine · Boeing 737990ER

Difficulty date: July 16, 2017
Submitted: July 17, 2017
Operation: Air carrier
Aircraft: N457AS
Make and model: Boeing 737990ER
Aircraft serial: 36355
Aircraft time: 13,827 hours, 4,568 cycles
Engine: Cfmint CFM567B27E
System (JASC): 7220 · Turbine Engine Air Inlet Section
Part: Engine
Condition: Out Of Balance
Location: Nr 1
Stage of operation: NR
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

NR 1 ENGINE TREND DATA SHOWS LOW PRESSURE ROTOR VIBRATION LEVELS CONTINUE TO RISE AFTER LAST FAN LUBE. PRI NR 2 ENGINE RUN REQUIRED. ACFT GROUNDED. COMPLIED WITH ALL STEPS OF TSR908522, ACCOMPLISHED ON BOARD FAN TRIM BALANCE PROCEDURE IAW AMM 71-00-00-750-808-F00. BALANCE WEIGHTS CHANGED AS FOLLOWS NR 6 P03 TO P014, NR 26 P014 TO P011, NR 36 P03 TO P014, NR 36 P014 TO P011. ACCOMPLISHED VIBRATION SURVEY IAW AMM 71-00-00, TEST 7, VIBRATION WITHIN ACCEPTABLE LIMITS IN ALL PHASES. GROUND VERIFICATION SUCCESSFUL.