# SDR ASAA2021041934620

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 2021
- Submitted: April 21, 2021
- Operation: Air carrier
- Aircraft: [N431AS](https://openairdocs.org/aircraft/N431AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43255
- Aircraft time: 27,951 hours, 9,022 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [7220 · Turbine Engine Air Inlet Section](https://openairdocs.org/jasc/7220)
- Part: Blade
- Part number: 3400010360
- Part serial: PA9707888
- Condition: Eroded
- Location: Nr 2 Engine
- Part time: 27,951 hours, 9,022 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021041934620

## Discrepancy

WHILE ACCOMPLISHING MTC 78472010, FOUND NR 2 ENG FAN BLADE NR 13 WITH MISSING CU-NI-IM COATING. MISSING BEYOND ALLOWABLE LIMITS. 27MM ON THE CONCAVE SIDE CONTACT AREA. GROUNDED - YES. REPLACED NR 13 FAN BLADE ON NR 2 ENG. AND ITS PAIR NR 1 PER T/C 78472010.

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