# SDR CALA2022020400320

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 3, 2022
- Submitted: February 4, 2022
- Operation: Air carrier
- Aircraft: [N37521](https://openairdocs.org/aircraft/N37521), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 64497
- Aircraft time: 3,021 hours, 1,039 cycles
- System (JASC): [3150 · Central Warning](https://openairdocs.org/jasc/3150)
- Part: Warning System
- Part number: NA
- Part serial: NA
- Condition: False Indication
- Location: Na
- Stage of operation: TO
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2022020400320

## Discrepancy

TAKE OFF  WARNING HORN SOUNDING AT ALL TIMES...CYCLED FLIGHT CONTROLS, PARKING BRAKE, STAB TRIM....NO HELP ACP TS PER IFM 31-50-00-810-803. MAINTENANCE MESSAGE FAULT CODE 315 102 00. PSEU PARKING BRAKE A AND B SIGNAL DISAGREE. ACP BITE OF PSEU AND NO FAULTS. ACP TAKE OFF WARNING TEST PER AMM 31-51-00-730-803, SYSTEM OP CHECKS OK

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