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B757-200 first officer reported difficulty maintaining cabin pressure following failure of the left engine bleed valve.
| Attributes | |
| ACN | 1384360 |
| Time | |
| Date | 201608 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pneumatic Valve/Bleed Valve |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
At FL370 the left engine bleed off light illuminated. Ran the QRH and shut off the left engine bleed valve and left a/C pack. After 15 minutes; cabin altitude climbed slightly so we requested and began descent to FL310. During descent the cabin alt warning horn and light came on. Donned oxygen masks and continued descent to 10;000. Cabin alt light extinguished around 11;000 feet. Continued to destination at 10;000 ft.engine bleed failure resulted in rising cabin altitude and need for descent and oxygen masks.
Original NASA ASRS Text
Title: B757-200 First Officer reported difficulty maintaining cabin pressure following failure of the left engine bleed valve.
Narrative: At FL370 the Left Engine Bleed Off light illuminated. Ran the QRH and shut off the left engine bleed valve and left A/C pack. After 15 minutes; cabin altitude climbed slightly so we requested and began descent to FL310. During descent the Cabin Alt warning horn and light came on. Donned oxygen masks and continued descent to 10;000. Cabin alt light extinguished around 11;000 feet. Continued to destination at 10;000 ft.Engine bleed failure resulted in rising cabin altitude and need for descent and oxygen masks.
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.