# SDR AALA202010309024

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2020
- Submitted: November 2, 2020
- Operation: Air carrier
- Aircraft: [N960NN](https://openairdocs.org/aircraft/N960NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33330
- Aircraft time: 18,552 hours, 7,245 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: B-Nut
- Condition: Loose
- Location: Brake Hydraulics
- Stage of operation: NR
- How discovered: O
- Nature of condition: K
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202010309024

## Discrepancy

AIRCRAFT WAS GROUNDED.  DURING NORMAL BRAKING THE BRAKE PRESSURE GAUGE DROPS BY 100 PSI AND DURING APPLICATION B HYD SYSTEM DROPS 10 PSI.  TIGHTENED B NUT AT HYDRAULIC ACCUMULATOR ISOLATION VALVE, PER 20-50-11.  LEAK CHECKED GOOD, PER AMM 29-00-00.  ACCOMPLISHED BRAKE BLEED, PER AMM 32-41-0.

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