- Difficulty date
- July 1, 2017
- Submitted
- July 5, 2017
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35187
- Aircraft time
- 39,351 hours, 11,726 cycles
- Engine
- Cfmint CFM567B27
- Part
- Sensor
- Part number
- 3205490050
- Part serial
- EM173382W
- Condition
- Failed
- Location
- N2 Speed
- Part time
- 12,387 hours, 3,717 cycles
- Stage of operation
- NR
- How discovered
- 9
- 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 VIBRATION INDICATOR INTERMITTENTLY BLANKS OUT AND THEN REAPPEARS. ACFT GROUNDED. CONFIRMED FAULT, M1240 ENGINE VIBRATION SIGNAL CONDITIONER, VIBROMETER BITE IAW FIM 77-05 TASK 804, SHOWS ENGINE NR 1 N2 TACHO LOSS E1 MESSAGES LAST 32 FLIGHTS. ACCOMPLISHED FIM 77-31 TASK 805, TROUBLESHOT TO DEFECTIVE N2 SPEED SENSOR. REMOVED & REPLACED N2 SPEED SENSOR IAW AMM 77-11-02, GROUND FUNCTIONAL CHECK NORMAL IAW AMM 77-00-00.