# SDR ASAA2024041049132

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 10, 2024
- Submitted: April 23, 2024
- Operation: Air carrier
- Aircraft: N303AS
- Make and model: Boeing 737990
- Aircraft serial: 30016
- Aircraft time: 74,789 hours, 30,311 cycles
- System (JASC): [5330 · Fuselage Main, Plate/Skin](https://openairdocs.org/jasc/5330)
- Part: Skin
- Part number: 147A31103
- 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/ASAA2024041049132

## Discrepancy

LAV DRAIN PORT HAS CORROSION LOWER SIDE OF DRAIN. GROUNDED - YES. REPAIRED DAMAGE AT LOWER LAV DRAIN PORT IAW B737-900 SRM 53-70-01-2R-3 CATEGORY B REPAIR INSPECTION REQUIREMENTS INSPECTION THRESHOLD 50,000 FLIGHT CYCLES AND REPEAT INSPECTION INTERVALS EVERY 5,000 FLIGHT CYCLES IAW B737-900 SRM 53-70-01-2R-3 TABLE 202W=.75" O=.125 R=.089 L=2.0" D=.036.

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