# SDR CALA2026052816597

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 26, 2026
- Submitted: May 28, 2026
- Operation: Air carrier
- Aircraft: [N37255](https://openairdocs.org/aircraft/N37255), registered now
- Make and model: Boeing 737824
- Aircraft serial: 30610
- Aircraft time: 77,618 hours, 29,101 cycles
- System (JASC): [5414 · Nacelle/Pylon, Plate/Skin](https://openairdocs.org/jasc/5414)
- Part: Skin
- Part number: 31422062
- Condition: Corroded
- Location: Zone 400
- 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/CALA2026052816597

## Discrepancy

NR 1 ENGINE INBD (R/H) FAN COWL, LOWER INNER SKIN HAS SIGNS OF SURFACE CORROSION. REMOVED AND REPLACED NR 1 ENG INBD RT FAN COWL DOOR 2ND FROM FWD ZEE FRAME  AND LOWER END TEE CLIP  IAW SRM 51-40-02-0G-0 AND CMM 71-13-30. BLENDED LOWER EMD OF ZEE FRAME, FOUND TO BE OUT OF LIMITS IAW SRM 54-20-02-1A-1 ALLOWABLE DAMAGE 1 FAN COWL DOOR STRUCTURE FIG 103 SHEET 2.  CLEANED LOWER INNER FWD SKIN, NO CORROSION NOTED AT THIS TIME. NO MATERIAL LOSS. BLENDED FWD LOWER INNER OF LONGERON, ORIGINAL MATERIAL 0.063" REMAINING MATERIAL 0.060", REMOVED 0.003", WITHIN LIMITS IAW  SRM 54-20-02-1A-1 ALLOWABLE DAMAGE 1 FAN COWL DOOR STRUCTURE FIG 103 SHEET 2.

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