# SDR CKSA98681

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 20, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N713CK](https://openairdocs.org/aircraft/N713CK), registered now
- Make and model: Boeing 747-2B4B
- Registry model: [Boeing 747-2B4B](https://openairdocs.org/model/boeing-747-2b4b) (OpenAirDocs)
- Aircraft serial: 21099
- System (JASC): [5313 · Fuselage Main, Longeron/Stringer](https://openairdocs.org/jasc/5313)
- Part: Longeron
- Part number: 65B1500410
- Condition: Corroded
- Location: Bs 1350
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CKSA98681

## Discrepancy

LONGERON AT ZONE 100, STA 1350 TO STA 1468, WL 152, RBL133 CHANGED FOR CORROSION.  AT HORIZ FLANGE (REMOVED PREVIOUS PER S/B) WEB HAS LOCALIZED EXFOLIATION CORROSION.  REPLACED LONGERON AND WEB IAW BOEING ASA CKF-EXB-223 SUPP SHTS 6 AND 7.  FOUND DURING ACCOMPLISHMENT OF CARGO CONVERSION, ROUTINE C-CHECK, AND ACCOMPLISHMENT OF CPCP TASK CARDS AT BOEING WICHITA (KIAB).  WORK ORDER NUMBER MO280, TASK CARD NR CKF-EXB-023, CPCP TASK CARD NR C53-190-01-02.

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