# SDR DLL10980921

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 24, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N721DA
- Make and model: Lkheed 10113851
- Aircraft serial: 193C1139
- System (JASC): [5730 · Wing, Plate/Skin](https://openairdocs.org/jasc/5730)
- Part: Skin
- Condition: Cracked
- Location: Ws 477
- 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/DLL10980921

## Discrepancy

FOUR FASTENER HOLES IN THE LOWER WING SKIN AT IWS 477 AND STRINGER 17 WERE FOUND CRACKED ON BOTH WINGS.  THE CRACKS ARE THE SUBJECT OF SID AD 95-20-04, R1 (SID NR 57-3-2).  THE CRACKED HOLES WERE OVERSIZED TO REMOVE THE CRACKS AND   ALUMINUM BUSHINGS WERE INSTALLED.  THE REPAIR WAS ACCOMPLISHED PER ER/A 364606-14AD, REV B.

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