# SDR SWAA2022031841437

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 2019
- Submitted: March 18, 2022
- Operation: Air carrier
- Aircraft: N420WN
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29825
- Aircraft time: 61,359 hours, 36,009 cycles
- System (JASC): [5711 · Wing Spar](https://openairdocs.org/jasc/5711)
- Part: Spar
- Condition: Corroded
- Location: Left Wing
- 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/SWAA2022031841437

## Discrepancy

LEFT WING REAR SPAR BOOST PUMP TANK 1 AFT HAS CORROSION AT UPPER BONDING JUMPER IFSS 145 8.5' FROM UPPER CHORD / REMOVED CORROSION ON L/H WING REAR SPAR BOOST PUMP AT UPPER BONDING JUMPER ATTACH POINT IFSS 145 IAW SRM 51-10-02-0G-0. VERIFIED ALLOWABLE LIMITS; ORIGINAL .685' LOSS .122 REMAINIG .563' OUT OF LIMITS IAW SRM 57-20-10-1A-3. REPAIRED REAR SPAR WEB AT BOOST PUMP BONDING JUMPER ATTACH POINT IAW AR EA 190735 IR AND SWA EA 1-757-16540 REV IR

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