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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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MD82 flight crew notices a pressurization outflow light illuminated at FL270. Inspection of the pressurization system panel reveals both packs at zero flow; cabin outflow valve fully closed; cabin rate indication climbing at 500 FPM; and cabin altitude around 6;500 ft. QRH procedures are unsuccessful and descent is initiated. At 14;000 ft packs return to normal operation but a diversion for fuel is deemed prudent.
| Attributes | |
| ACN | 1092912 |
| Time | |
| Date | 201306 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | MD-82 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Air Conditioning and Pressurization Pack |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Total 17600 |
| Person 2 | |
| Function | Captain Pilot Not Flying |
| Experience | Flight Crew Type 17600 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Fuel Issue |
Narrative:
During cruise we noticed the pressurization outflow light illuminated. Inspection of pressurization panel revealed both packs at zero flow; cabin outflow valve closed; cabin rate indicator climbing 500 FPM; and cabin altitude passing 6;500 ft. We performed QRH procedures and the cabin altitude continued to climb. We then initiated a descent with ATC but were stopped at FL240. With cabin continuing to climb capt declared an emergency to facilitate descent to 10;000 ft. Passing 14;000 ft the left pack; followed by the right pack; returned to normal operation. Approaching 10;000 ft we were in contact with dispatch. With 10;700 pounds fuel capt coordinated with dispatch to divert for fuel.
Original NASA ASRS Text
Title: MD82 flight crew notices a pressurization outflow light illuminated at FL270. Inspection of the pressurization system panel reveals both packs at zero flow; cabin outflow valve fully closed; cabin rate indication climbing at 500 FPM; and cabin altitude around 6;500 FT. QRH procedures are unsuccessful and descent is initiated. At 14;000 FT packs return to normal operation but a diversion for fuel is deemed prudent.
Narrative: During cruise we noticed the PRESSURIZATION OUTFLOW light illuminated. Inspection of pressurization panel revealed both packs at zero flow; cabin outflow valve closed; cabin rate indicator climbing 500 FPM; and cabin altitude passing 6;500 FT. We performed QRH procedures and the cabin altitude continued to climb. We then initiated a descent with ATC but were stopped at FL240. With cabin continuing to climb Capt declared an emergency to facilitate descent to 10;000 FT. Passing 14;000 FT the left pack; followed by the right pack; returned to normal operation. Approaching 10;000 FT we were in contact with Dispatch. With 10;700 LBS fuel Capt coordinated with Dispatch to divert for fuel.
Data retrieved from NASA's ASRS site as of July 2013 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.