 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Released by maintenance with a deferred partially open pressurization outflow valve; a B777 fails to pressurize. Must dump fuel and return to departure airport for maintenance.
| Attributes | |
| ACN | 823577 |
| Time | |
| Date | 200902 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Captain |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 20000 Flight Crew Type 900 |
| Person 2 | |
| Function | Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 15000 Flight Crew Type 1500 |
| Events | |
| Anomaly | Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy Deviation - Procedural MEL |
Narrative:
The pressurization system was deferred with the aft outflow valve in a partially open position. During climb; it was noticed that the aircraft and cabin were climbing at the same rate and the aircraft was leveled at 9;000 ft and the autopilot engaged. Maintenance was called via satcom and we were advised that some cbs may have been in the wrong position and it was unlikely that the situation could be remedied inflight; so we dumped fuel and returned to ZZZ. The situation was remedied and we subsequently departed with no further events.
Original NASA ASRS Text
Title: Released by maintenance with a deferred partially open pressurization outflow valve; a B777 fails to pressurize. Must dump fuel and return to departure airport for maintenance.
Narrative: The pressurization system was deferred with the aft outflow valve in a partially open position. During climb; it was noticed that the aircraft and cabin were climbing at the same rate and the aircraft was leveled at 9;000 FT and the autopilot engaged. Maintenance was called via SATCOM and we were advised that some CBs may have been in the wrong position and it was unlikely that the situation could be remedied inflight; so we dumped fuel and returned to ZZZ. The situation was remedied and we subsequently departed with no further events.
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.