# SDR SWAA2020030442049

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2020
- Submitted: March 4, 2020
- Operation: Air carrier
- Aircraft: [N426WN](https://openairdocs.org/aircraft/N426WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29830
- Aircraft time: 61,080 hours, 36,269 cycles
- System (JASC): [5314 · Fuselage Main, Keel](https://openairdocs.org/jasc/5314)
- Part: Fitting
- Part number: 146A7730
- Condition: Corroded
- Location: Fuselage
- 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/SWAA2020030442049

## Discrepancy

***CORROSION***  ON KEEL BEAM CLIP COMMON TO VHF ANTENNA MOUNT BS 727D+9" FORWARD INBOARD STR 27L DUE TO BLUE WATER SPILL         CORROSION FOUND OUT OF LIMITS DUE TO NO ALLOWABLE DAMAGE GIVEN IN SRM REMOVED CLIP FABRICATED FROM BAC1493-672T62 M#1370754-1, LOCATED, DRILLED, APPLIED CHEMICAL CONVERSION COATING PRIMED & INSTALLED PER DWG 146A7730 SRM 51-40-02-0G-0, AMM 51-21-41-370-802, AMM 51-21-72-370-804. FASTENERS COMMON TO KEEL BEAM TO BE INSTALLED ON CUSTOMER CARD U116483 SAM 326 A 1294210 BLOCK 8

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