# SDR DALA2020110603628

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 5, 2020
- Submitted: November 7, 2020
- Operation: Air carrier
- Aircraft: [N3761R](https://openairdocs.org/aircraft/N3761R), registered now
- Make and model: Boeing 737832
- Aircraft serial: 29628
- Aircraft time: 62,417 hours, 22,768 cycles
- Engine: Cfmint CFM567B262
- Engine time: 60,238 hours, 22,601 cycles
- System (JASC): [7220 · Turbine Engine Air Inlet Section](https://openairdocs.org/jasc/7220)
- Part: Blade
- Condition: Damaged
- Location: Nr 2 Eng Fan
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2020110603628

## Discrepancy

ATB, PERFORMED AIR TURN BACK TO ANC DUE TO EXCESSIVE AIRFRAME VIBRATION WHEN NR 2 ENGINE THROTTLE ADVANCED.  DID NOT SHUT DOWN NR 2 ENGINE.  CORRECTIVE ACTION: FOUND NR 2 ENGINE FAN BLADE PLATFORM MISSING AND DAMAGE TO FAN BLADES AND OGV'S.  PERFORMED FULL BORESCOPE OF ENGINE WITH NO SIGNS OF DAMAGE.  BLENDED CONTAINMENT CASE, PER ERA 536292-14.  REPLACED WHOLE BLADE FAN SET, IAW B737 AMM 72-21.  INSPECTED FAN AND BOOSTER ASSEMBLY, PER B737 AMM 72-21.  PERFORMED TESTS, PER B737 AMM 71-00.

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