# SDR AALA202108207353

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 9, 2021
- Submitted: August 20, 2021
- Operation: Air carrier
- Aircraft: [N802NN](https://openairdocs.org/aircraft/N802NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31073
- Aircraft time: 35,325 hours, 14,474 cycles
- System (JASC): [5510 · Horizontal Stabilizer Structure](https://openairdocs.org/jasc/5510)
- Part: Stiffener
- Condition: Cracked
- Location: Horizontal Stab
- 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/AALA202108207353

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: CRACK IN VERTICAL STIFFENER OF LH HORIZONTAL STABILIZER RIB AT STA 129.5, 18 IN AFT OF FRONT SPAR, MEASURING L=0.5 IN, W=0.003 IN, D=0.05 IN. REPLACED RIB WITH NEW IAW AARD 51-00-05.

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