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B757-200 captain reported a pneumatic duct overheat and a pneumatic shutoff valve closed; leaving the aircraft with no pneumatic air. Flight diverted to a nearby suitable airport.
| Attributes | |
| ACN | 1297018 |
| Time | |
| Date | 201509 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pneumatic Ducting |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
At FL270; approximately one hour after takeoff; flying in icing conditions with wing and engine anti-ice systems selected 'on'; the right pneumatic duct overheated and the right pressure regulating shutoff valve closed. Followed QRH procedures and opened the isolation valve per the checklist. Approximately 30 minutes later; the left pressure regulating shutoff valve automatically closed; leaving the aircraft with no pneumatic air supply. Attempted to restore the left side pneumatic air supply per the QRH but was not successful. Immediately [notified] ATC while simultaneously starting the APU and both pilots donning oxygen masks. Requested to descend out of icing conditions and get the cabin altitude below 10;000 feet. No more icing conditions after descending below FL190. After descending below 17;000 feet; the aircraft started re-pressurizing with the APU pneumatic system. Aircraft was being stored for over one year in the high desert in southern california. Aircraft parts fail at a higher rate when placed in adverse weather conditions after being stored for such a long period of time.very difficult to prevent this type of event when the aircraft is stored for such a long period of time.
Original NASA ASRS Text
Title: B757-200 Captain reported a pneumatic duct overheat and a pneumatic shutoff valve closed; leaving the aircraft with no pneumatic air. Flight diverted to a nearby suitable airport.
Narrative: At FL270; approximately one hour after takeoff; flying in icing conditions with wing and engine anti-ice systems selected 'ON'; the right pneumatic duct overheated and the right pressure regulating shutoff valve closed. Followed QRH procedures and opened the isolation valve per the checklist. Approximately 30 minutes later; the left pressure regulating shutoff valve automatically closed; leaving the aircraft with no pneumatic air supply. Attempted to restore the left side pneumatic air supply per the QRH but was not successful. Immediately [notified] ATC while simultaneously starting the APU and both pilots donning oxygen masks. Requested to descend out of icing conditions and get the cabin altitude below 10;000 feet. No more icing conditions after descending below FL190. After descending below 17;000 feet; the aircraft started re-pressurizing with the APU pneumatic system. Aircraft was being stored for over one year in the high desert in Southern California. Aircraft parts fail at a higher rate when placed in adverse weather conditions after being stored for such a long period of time.Very difficult to prevent this type of event when the aircraft is stored for such a long period of time.
Data retrieved from NASA's ASRS site 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.