# SDR CALA2026100820210

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 23, 2026
- Submitted: October 8, 2026
- Operation: Air carrier
- Aircraft: [N39416](https://openairdocs.org/aircraft/N39416), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 37093
- Aircraft time: 57,957 hours, 20,810 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Pan
- Part number: 146A323132
- Condition: Corroded
- Location: Zone 900
- 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/CALA2026100820210

## Discrepancy

UPON REMOVAL OF LAV SERVICE PAN FOUND CORROSION ON SKIN AROUND CUTOUT.  PER B737 SRM 53-60-01-0I-1 FIGURE 9 SHEET 4 ORIGIONAL SKIN THICKNESS IS .080". REMOVED CORROSION AND FOUND OUT OF LIMITS. REF SRM 53-00-01-1A-5, APPLIED GRID TO DAMAGED AREA.  DRILLED HOLES IN LAV PAN INSIDE STRUCTURE IAW SRM 51-40-02.  PERFORMED UT THICKNESS MEASUREMENTS FOR REMAINING MATERIAL (FOR GRID) IAW NTM PART 4 00-04-02. STEPS 1-4(D) OF AVO: 18410.  REMOVED EXISTING FASTENERS IN CUTOUT AREA,  PERFORMED DVI OF THE SKIN AT REPORTED DAMAGED AREA PER AVO 18410 STEP A(4)(E). VERIFIED CORROSION REMOVAL. ACCOMPLISHED STEP 5 (A-C).  ACCOMPLISHED STEP 5 (A-C). STEP 5 (D) REQ HFEC INSPECT EDGES OF TRIM OUT IAW NDT MANUAL PART 6, 51-00-00,PROCEDURE 23.  PERFORMED HFEC INSPECTION OF TRIM OUT NDT MANUAL PART 6, 51-00-00,  PROCEDURE 23, NO DEFECTS NOTED.  REPAIR COMPLETED, ITITATED (2) DIPS REF L/P 3638591, 3638548. REF FINAL ECRA 5300-03399.

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