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An MD80 on a functional check flight for pressurization problems experienced loss of outflow valve control; declared an emergency; and returned to base.
| Attributes | |
| ACN | 973855 |
| Time | |
| Date | 201110 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization Control System |
| Person 1 | |
| Function | Other / Unknown |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Flight [was] on a functional check flight under part 91 for pressurization issues. Aircraft was at FL250; conducting normal fcf [functional check flight] pressurization checks when outflow valve failed in open position. Unable to control outflow valve manually and with cabin altitude climbing uncontrollably; notified center for the need to descend and declared emergency. We descended to 10;000 ft and; at that altitude; were able to regain control of the outflow valve; returned for normal approach and landing.
Original NASA ASRS Text
Title: An MD80 on a functional check flight for pressurization problems experienced loss of outflow valve control; declared an emergency; and returned to base.
Narrative: Flight [was] on a functional check flight under Part 91 for pressurization issues. Aircraft was at FL250; conducting normal FCF [Functional Check Flight] pressurization checks when outflow valve failed in open position. Unable to control outflow valve manually and with cabin altitude climbing uncontrollably; notified Center for the need to descend and declared emergency. We descended to 10;000 FT and; at that altitude; were able to regain control of the outflow valve; returned for normal approach and landing.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.