# SDR SWAA2022020860318

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 8, 2022
- Submitted: February 8, 2022
- Operation: Air carrier
- Aircraft: [N943WN](https://openairdocs.org/aircraft/N943WN), registered now
- Make and model: Boeing 737*
- Aircraft serial: 36913
- Aircraft time: 39,369 hours, 23,825 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Rail
- Condition: Corroded
- Location: Fuselage
- Stage of operation: UK
- 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/SWAA2022020860318

## Discrepancy

CORROSION ON RAIL AT AFT CARGO BAY BS767+6 LBL3. ; / [01] VERIFIED APPLICABILITY OF SRM 53-60-53-0I-2 FOR IDENTIFICATION AND SRM 53-00-53-1A-2 FOR ALLOWABLE DAMAGE; [02] CORRECTED MEASUREMENTS; [03] REMOVED CORROSION ON RAIL AT AFT CARGO BAY BS767+6 LBL3. MEASURES:L=2.600';W=0.900';D=0.025'; ORIGINAL THICKNESS:0.063';MATERIAL LOSS=0.025'; REMAINING THICKNESS OF MATERIAL=0.038'. THE RAIL IS OUT OF LIMITS. IAW. SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2 STEP 4.(2)(A). TOOL USED: DIGITAL CALIPER ID ATS2500; DUE DATA 03/2022.; [04] VERIFIED CORRECTIVE ACTIONS 1 AND 3.; [05] VERIFIED SRM 53-00-53-2R-3 IS APPLICABLE FOR CARGO TRACK REPAIR AT B.S 767+6 LBL 3.; [06] CUT OUT THE DAMAGED THE UPPER FLANGE OF THE CARGO TRACK 3.3X.9 INCH PER SRM 53-00-53-2R-3 FIG 202 STEP 4B(1)(B).; [07] VERIFIED CORRECTIVE ACTION STEPS 5 AND 6.; [08] HFEC INSPECTED CUT OUT IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23; NO CRACKS NOTED. EQUIP USED: NORTEC 600 ID: ATS1465; [09] RECEIVED REINFORCING CHANNEL SPLICE FROM MACHINE SHOP ON CUSTOMER RO # 825613 ; AFTER BEING MACHINED TO FIT AND PENETRANT INSPECTED . MATERIAL USED BAC1510-1355 ; 7050-T76511 EXTRUSION LOT# 1458838-1 ; FABRICATED ; LOCATED AND DRILLED IAW SRM 53-00-53-2R-2 OK TO TREAT AND PRIME;[13] INSTALLED THE REINFORCING CHANNEL SPLICE AT ACB RAIL BS 767+6 LBL3 IAW SRM 53-00-53-2R-2 REPAIR 2; [14] VERIFIED CORRECTIVE ACTION ITEM 13.; [15] VERIFIED FAULT TTG8Q00A6MMG IS COMPLETE.; [16] CORRECTED MEASUREMENTS

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