# SDR CALA2026101920453

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 6, 2026
- Submitted: October 19, 2026
- Operation: Air carrier
- Aircraft: [N23708](https://openairdocs.org/aircraft/N23708), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28769
- Aircraft time: 85,743 hours, 31,800 cycles
- System (JASC): [5310 · Fuselage Main, Structure](https://openairdocs.org/jasc/5310)
- Part: Pan
- Part number: 146A7401Y21
- 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/CALA2026101920453

## Discrepancy

AFT CARGO, VACUUM WASTE COMPARTMENT WITH POSSIBLE CORROSION ON PANEL NEXT TO WASTE DRAIN VALVE ASSY.  REMOVED WASTE PAN ASSY DAMAGED , LOCATED, DRLLED, & PERFORMED COUNTERSUNK, ON NEW WASTE PAN ASSY, BLENDED AND EVALUATED  CORROSION ON FUSELAGE SKIN  BETWEEN BS 847 TO  867, STR 23L TO 25L.  ORIGINAL THICKNESS: 0.080", MATERIAL LOSS: 0.004", REMAINING MATERIAL: 0.076 FOUND TO BE WITHIN LIMITS AND APPLIED ALODINE PRIMER AND TOP COAT IAW SRM 51-40-02-02-G, 51-40-05-0G-0, 51-40-08-0G-0, 51-10 -G-0, 53-00-01-1A-5, 51-20-01-0G-0, AMM 51-21-72-370-804, 51-31-00-390-805, 20-60-07-913-801.

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