# SDR SWAA2022050996191

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2022
- Submitted: May 9, 2022
- Operation: Air carrier
- Aircraft: [N927WN](https://openairdocs.org/aircraft/N927WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36889
- Aircraft time: 45,530 hours, 27,478 cycles
- System (JASC): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- Condition: Corroded
- Location: Aft 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/SWAA2022050996191

## Discrepancy

CORROSION ON FUSELAGE SKIN AT B.S. 1016 - 1016+25; L.B.L. 14 - R.B.L. 14; W.L. 306.5. / [01] VERIFIED SRM 53-00-01-1A-1 ALLOWABLE DAMAGE 1 IS APPLICABLE FOR THIS AIRCRFT;[02] REMOVED CORROSION ON FUSELAGE SKIN AT B.S. 1016 - 1016+25; L.B.L. 14 - R.B.L. 14; W.L. 306.5 AREA 2EA (15'X1.5'); 1EA (12'X1.5') AND 1EA (3'X4') IAW SRM 51-10-02-0G-0.;[03] REMOVED FASTENERS COMMON TO STR 2L; 2R AND 2AR IAW SRM 51-40-02-0G-0;[04] VERIFIED CORRECTIVE ACTION #1; 2;[05] UT THICKNESS TESTED BLENDED AREAS PER 737NDT PART 4 51-00-00 PROCEDURE 2. FILLED OUT GRID MAP WITH REMAINING THICKNESS DIMENSIONS. LOWEST REMAINING IN POCKETED BAYS IS .063. LOWEST REMAINING AT PAD UP AREAS IS .075'. TOOL E650 ATS2031.;[06] CORRECTED MEASUREMENTS PER NDI;[07] CORROSION ON FUSELAGE SKIN AT B.S. 1016 - 1016+25; L.B.L. 14 - R.B.L. 14; W.L. 306.5 LOWEST REMAINING IN POCKETED BAY IS .063' FROM .063' AND LOWEST REMAINING AT PAD UP AREAS IS .075' FROM .080'.<BR><BR> FOUND TO BE OUT OF LIMITS DUE TO NO MORE THAN THREE FASTENERS IN ALL GROUP OF TEN AROUND THE REMOVAL OF MATERIAL IS PERMITTED IAW SRM 53-00-01-1A-1 STEP 4.C.(2) FIGURE 103 ALLOWABLE DAMAGE 1 DETAIL 'D'.<BR><BR>ENGINEERING REQUIRED.;[08] VERIFIED CORRECTIVE ACTION #7;[09] AS PER EA 22-153-01214; THE DAMAGE IS ACCEPTABLE AS A CONTINUE-IN-SERVICE CONDITION WITHOUT REPETITIVE INSPECTIONS AND NO TERMINATING ACTION REQUIREMENTS.;[10] CORRECTED MEASUREMENTS.;[11] VERIFIED ALL STEPS COMPLETE.

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