# SDR ASAA2015080312664

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 3, 2015
- Submitted: August 5, 2015
- Operation: Air carrier
- Aircraft: [N461AS](https://openairdocs.org/aircraft/N461AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36363
- Aircraft time: 5,363 hours, 1,756 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: B-Nut
- Condition: Loose
- Location: Nr 1 Engine
- Stage of operation: CR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015080312664

## Discrepancy

DUCT SPLIT RT DUCT 44, LT DUCT BOUNCING BETWEEN 25 AND 30 PRESSURIZATION WAS NORMAL AFTER ALMOST 4 HRS IN FLT, RT DUCT 44, LT DUCT 35.  ACFT GROUNDED.  FOUND LEAK ON CONTROL PRESSURE SENSE LINE AND SUPPLY PRESSURE SENSE LINE.  TIGHTENED B-NUTS DURING MM TASK 36-12-00, RAN ENGINES AT HIGH POWER.  VERIFIED DUCT PRESSURE ON BOTH ENGINES WITHIN LIMITS.  NEEDLES MARRIED.

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