What was found
NR 2 ENGINE TREND DATA SHOWS LOW PRESSURE ROTOR VIBRATION LEVELS TO BE TRENDING HIGHER THAN EXPECTED. CURRENT LEVELS NEAR 1.5 UNITS. ACFT GROUNDED. NR 2 ENGINE ON BOARD FAN TRIM BALANCE COMPLETE IAW MM 71-00-00.
- Difficulty date
- May 23, 2015
- Submitted
- May 27, 2015
- Operation
- Air carrier
- Aircraft
- N442AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 43293
- Aircraft time
- 5,927 hours, 1,911 cycles
- Engine
- Cfmint CFM567B27E
- System (JASC)
- 7220 · Turbine Engine Air Inlet Section
- Part
- Counterbalance
- Part number
- 3013156240
- Condition
- Out Of Adjust
- Location
- Nr 2 Engine
- Stage of operation
- IN
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.