# SDR ASAA2026021364445

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 13, 2026
- Submitted: February 23, 2026
- Operation: Air carrier
- Aircraft: [N251AK](https://openairdocs.org/aircraft/N251AK), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 62470
- Aircraft time: 34,790 hours, 11,280 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Transition Panel
- Part number: 143A7501192
- Condition: Corroded
- Location: Zone 200
- 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/ASAA2026021364445

## Discrepancy

WHILE GAINING ACCESS TO REPLACE BONDED NUTPLATES AT STA 500J; FOUND R/H TRANSITION PANEL CORRODED FROM STATIONS 500H TO 500L RBL 25. GROUNDED - YES. REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 ORIGINAL THICKNESS .040, MATERIAL REMOVED .035, MATERIAL REMAINING .005. REMOVED AND REPLACED SECTION OF TRANSITION PANEL BETWEEN BS 500+20 TO 500L IAW SRM 51-40-02 AND DWG 143A7500, REV-, AND SRM 53-00-53-2R-5.  REMOVED AND REINSTALLED FLOOR PANEL 120EF IAW AMM 25-52-10-400-801.

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