# SDR SWAA2022042085216

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 17, 2022
- Submitted: April 20, 2022
- Operation: Air carrier
- Aircraft: [N472WN](https://openairdocs.org/aircraft/N472WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33831
- Aircraft time: 58,559 hours, 34,804 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Condition: Corroded
- Location: Fwd Fuselage
- 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/SWAA2022042085216

## Discrepancy

CORROSION ON FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT B.S. 277 - B.S. 294.5; L.B.L. 11; W.L. 208.1. / [01] REMOVED CORROSION ON FWD LAVATORY FLOOR SUPPORT CHANNEL BS 277-294.5 LBL11 WL 208.1 AREA OF 2'X2'X.030' ORIGINAL THICKNESS .188 FOUND TO BE OUT OF LIMITS I.A.W SRM 53-10-51-1A-1 DETAIL 4.B FIG 105 C <BR>TOOL USED DIAL DEPTH GAGE I.D ATS 2677 S/N UNKNOWN;[02] INSPECTED & VERIFIED CORRECTIVE ACTION ITEM 1.;[03] REMOVED ON FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT BS 277 BS 294.5 LBL 11 WL 208.1 IAW SRM 51-40-02;[04] RECEIVED ON FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT BS277-BS294.5 LBL11 WL208.1. ITEM141A5650U3 PO#861050. LOCATED AND DRILLED IAW SRM 51-40-05 AND DWG141A5600.<BR>OK TO INSTALL;[05] VERIFIED CORRECTIVE ACTIONS 3-4. VERIFIED REMOVAL OF DAMAGED 'CHANNEL' (INTERCOSTAL) AND LOCATING/DRILLING AND OK TO INSTALL REPLACEMENT INTERCOSTAL.;[06] INSTALLED ON FORWARD LAVATORY FLOOR SUPPORT CHANNEL AT BS 277-BS294.5 LBL11 WL208.1 IAW SRM 51-40-02 AND DWG141A5600;[07] VERIFIED CORRECTIVE ACTION 6

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