# SDR AALA202607274592

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 23, 2026
- Submitted: July 27, 2026
- Operation: Air carrier
- Aircraft: [N883NN](https://openairdocs.org/aircraft/N883NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31137
- Aircraft time: 43,131 hours, 18,525 cycles
- System (JASC): [5610 · Flight Compartment Windows](https://openairdocs.org/jasc/5610)
- Part: Tube
- Condition: Dislodged
- Location: Zone 200
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202607274592

## Discrepancy

AIRCRAFT WAS GROUNDED: AIRCRAFT WAS NOT PRESSURIZING AND AT 9300 FEET A LOUD HOWLING NOISE BECAME AUDIBLE IN THE FLIGHT DECK. DECESION MADE TO RETURN TO JFK AIRCRAFT LANDED WITHOUT INCIDENT.  FOUND CONDENSATION TUBE DISLODGED AND INTERFERING WITH L2 WINDOW CLOSURE AND AN IMPROPER SEAL CAUSING THE LOUD HOWLING. AFTER REPOSITIONING AND SECURING DRAIN TUBE AIRCRAFT PRESSURIZED AND THERE WAS NO LONGER A LOUD HOWLING ALL OPS NORMAL.ACCOMPLISHED PRESSURIZATION SYSTEM MANUAL MODE TEST PER MM 23-33-00710-801 AND PRESSURIZATION SYSTEM GROUND TEST PER MM 21-31-00-700-802. ALL TEST PASSED AIRCRAFT PRESSURIZED NORMALLY.

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