# SDR SWAA2021111725193

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 1, 2021
- Submitted: November 17, 2021
- Operation: Air carrier
- Aircraft: N774SW
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 27882
- Aircraft time: 69,284 hours, 41,071 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Condition: Corroded
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021111725193

## Discrepancy

AFT CARGO BILGE AREA; R/H SIDE 'Z' CHANNEL FROM BS 727 TO 767.   REMOVED CORROSION BILGE AREA R/H Z CHANEL IAW SRM 51-10-02-0G-0.   PERFORMED UT THIKNESS INSP. ON REWORKED AREA IAW  NDT PART 4 51-00-00 PROC. 3. MIN THICKNESS .030'.  ORIGINAL THICKNESS 0.040'' AFTER REWORKED AREA MINIMUM MAT FOUND 0.030; MAT LOST 0.10'' FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 FIG 103 DETAILS A, B, C, D AND E.  FABRICATED NEW Z CHANNEL.  TREATED AND PRIMED NEW Z CHANNEL AMM 51-00-58-201 & AMM 51-21-72-370-802.  INSTALLED NEW NUT PLATES ON NEW Z- CHANNEL IAW SRM 51-40-02-0G-0.  INSTALLED ON ITEM #TTG8Q002YTJ0 AFT CARGO MOD.

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