# SDR DL72L000285

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2000
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N501DA](https://openairdocs.org/aircraft/N501DA), registered now
- Make and model: Boeing 727232
- Aircraft serial: 21303
- System (JASC): [5310 · Fuselage Main, Structure](https://openairdocs.org/jasc/5310)
- Part: Noise
- Condition: Detected
- Location: Fuselage
- Stage of operation: CL
- Nature of condition: E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL72L000285

## Discrepancy

DURING CLIMBOUT A INTERMITTENT THUMPING NOISE WAS HEARD WHICH APPEARED TO BE COMING FROM UNDER THE 1ST CLASS CABIN.  THUMPING CONTINUED AT CRUISE FL330 FOR ABOUT 15 MIN AND THEN QUIT.  INSPECTED E&E, FWD CARGO PIT, FWD DOORS INCLUDING E&E, L1, L2, F/CARGO DOOR ALL UNITS IN RDO RACKS FOR SECURITY.  NO DISCREPANCIES NOTED.  PLATES, SKIN, ANTI, ALL CK OK.

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