# SDR UALA2013021900990

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 19, 2013
- Submitted: April 16, 2013
- Operation: Air carrier
- Aircraft: N575UA
- Make and model: Boeing 757222
- Aircraft serial: 26689
- Aircraft time: 65,994 hours, 24,408 cycles
- Engine: Pwa PW2037
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Diffuser
- Condition: Misinstalled
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2013021900990

## Discrepancy

EXCESSIVE NOISE IN FLT DECK AND AT ROWS 10-12.  AIRFLOW AND NOISE VERYLOUD IN CABIN ROWS 10-12.  MT 21-22-00 FOUND 4-5 DECIBLE DROP WITH RT RECIRC FAN BEING TURNED OFF.  FOUND ROW 12 SEATS 12A&F TO BE LOUDER THAN NORMAL FROM SIDEWALL RISERS AND OVERHEAD AREA LOUDER THAN REMAINING AC.  CLEANED OVERHEAD DUCT.  ACCOMPLISHED COMPLETE DUCT CLEAN OF AIRCRAFT REF MT21-22-00.  ALSO FOUND DIFFUSER IN COCKPIT ON OVERHEAD PANEL INSTALLED BACKWARDS.  REINSTALLED DIFFUSER, COCKPIT CHECKS WITHIN LIMITS.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.