# SDR IPXA2025071170051

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2025
- Submitted: July 11, 2025
- Operation: Air carrier
- Aircraft: [N434UP](https://openairdocs.org/aircraft/N434UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25465
- Aircraft time: 32,502 hours, 21,827 cycles
- System (JASC): [5100 · Standard Practices/Structures](https://openairdocs.org/jasc/5100)
- Part: Unknown
- Condition: Noise
- Stage of operation: CL
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2025071170051

## Discrepancy

LOUD NOISE  SHORTLY AFTER LIFT OFF STARTED AT A LOW FREQUENCY THEN SLOWLY INCREASED IN PITCH, SOUNDED LIKE AN ENGINE SLOWLY REVING TO REDLINE. NOISE ENDED @ 5000€™. SUSPECT CREW ENTRY DOOR SEAL PRESSURIZED AIRCRAFT PER MM 21-30-00, NO LEAKS OR KOOKY NOISES NOTED.

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