Narrative:

After takeoff denver, we found we were unable to pressurize airplane. Returned and landed at den after talking to dispatch. We received maintenance release document at last min before pushback, noted deferred aft outflow valve and MEL placard. With the valve deactivated, there is no cockpit indication as to valve position. Valve was to be deactivated 93% closed. After return to den, we were told the valve had been deactivated in the open position. This was the third aircraft assigned to this flight and therefore the third set of paperwork to sort through prior to departure. En route, before return to den, attempted to talk to maintenance controller but communication kept disconnecting. Followed SOP's.

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Original NASA ASRS Text

Title: B777-200 CREW WAS UNABLE TO PRESSURIZE THE ACFT AFTER DEP. MAINT MEL'ED THE OUTFLOW VALVE FULL OPEN, RATHER THAN 93% CLOSED. THE CREW RETURNED TO THE ARPT.

Narrative: AFTER TKOF DENVER, WE FOUND WE WERE UNABLE TO PRESSURIZE AIRPLANE. RETURNED AND LANDED AT DEN AFTER TALKING TO DISPATCH. WE RECEIVED MAINT RELEASE DOCUMENT AT LAST MIN BEFORE PUSHBACK, NOTED DEFERRED AFT OUTFLOW VALVE AND MEL PLACARD. WITH THE VALVE DEACTIVATED, THERE IS NO COCKPIT INDICATION AS TO VALVE POS. VALVE WAS TO BE DEACTIVATED 93% CLOSED. AFTER RETURN TO DEN, WE WERE TOLD THE VALVE HAD BEEN DEACTIVATED IN THE OPEN POS. THIS WAS THE THIRD ACFT ASSIGNED TO THIS FLT AND THEREFORE THE THIRD SET OF PAPERWORK TO SORT THROUGH PRIOR TO DEP. ENRTE, BEFORE RETURN TO DEN, ATTEMPTED TO TALK TO MAINT CTLR BUT COM KEPT DISCONNECTING. FOLLOWED SOP'S.

Data retrieved from NASA's ASRS site as of July 2007 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.