# SDR CALA2026062917411

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 25, 2026
- Submitted: June 30, 2026
- Operation: Air carrier
- Aircraft: [N37521](https://openairdocs.org/aircraft/N37521), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 64497
- Aircraft time: 18,129 hours, 6,039 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Part number: 143A7501
- Condition: Corroded
- Location: Zone 100
- 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/CALA2026062917411

## Discrepancy

FOUND DAMAGE CORROSION AT THE FWD CARGO FLOOR STRUCTURE ZEE CHANNEL LH SIDE FROM STA 500B TO STA 500L (REF AAR NR 1000080344) REMOVED AND REPLACED ZEE CHANNEL, APPLIED PRIMER AND ALODINE AT THE FWD CARGO FLOOR STRUCTURE LH SIDE FROM STA 500A TO STA 500L ALL WORK DONE IAW SRM 51-40-02-0G-0, 53-00-53-2R-5, 51-40-05-0G-0, 51-40-08-0G-0, 51-20-01-0G-0, SOPM 20-41-02.. REMOVED AND REPLACED ZEE CHANNEL, APPLIED PRIMER AND ALODINE AT THE FWD CARGO FLOOR STRUCTURE LH SIDE FROM STA 500A TO STA 500L ALL WORK DONE IAW B737-9MAX SRM 51-40-02-0G-0,53-00-53-2R-5,51-4 0-05-0G-0,51-40-0G-0,51-20-01-0G-0,SOPM 20-41-02 (SFR NO. 3850) (WORK ACCOMPLISHED BY V948025 AND AAR A-48 V950298).

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