# SDR ASAA2021101336279

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 13, 2021
- Submitted: October 15, 2021
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 53,265 hours, 15,696 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7220 · Turbine Engine Air Inlet Section](https://openairdocs.org/jasc/7220)
- Part: Shim
- Part number: 3402523070
- Condition: Worn
- Location: #1 Engine
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021101336279

## Discrepancy

WHILE PERFORMING FAN LUBE T/C 78472010 ON #1 ENGINE FOUND ALL SHIMS TO HAVE MOLYDAG COATING LOSS BETWEEN 25 TO 100%. GROUNDED - YES. REINSTALLED EXISTING SHIMS DUE NO NEW SHIMS AVAILABLE. SHIMS OK TO REMAIN IN SERVICE REF B737-800 AMM 72-21-02 SECTION L.  REPLACE ALL FAN BLADE SHIMS 340-252-307-0 (24) WITHIN 1850 CYCLES.

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