# SDR 97ZZZX3350

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Cooperativa Autogestionaria de Servicios Aeroindus, repair station EE4Y151M](https://openairdocs.org/faa-repair-station/EE4Y151M/cooperativa-autogestionaria-de-servicios-aeroindus.md) (OpenAirDocs)
- Aircraft: N259US
- Make and model: Boeing 727251
- Aircraft serial: 19978
- System (JASC): [5312 · Fuselage Main, Bulkhead](https://openairdocs.org/jasc/5312)
- Part: Bulkhead
- Condition: Cracked
- Location: Bs 1183 Lbl 26
- 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/97ZZZX3350

## Discrepancy

THE CRACK WAS FOUND IN THE AFT BULKHEAD VERTICAL BEAM LBL 26.83 WL 257.0.  THE CRACK IS ATTRIBUTED TO PRESSURIZATION CYCLES.  RECOMMENDATION:  THE SB 53-0182 RECOMMENDED TO INSTALL THE PREVENTIVE MODIFICATION AT OR BEFORE 60,000 CYCLES.  SUBMITTER RECOMMENDED THE PREVENTIVE MODIFICATION MUST BE INSTALLED AT OR BEFORE 45,000 CYCLES.

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