Flight crew of air carrier large transport aircraft failed to set the landing airport altitude in the aircraft pressurization system resulting in the aircraft not being completely depressurized when an attempt was made to open the cabin door after landing.

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Attributes
ACN	230579
Time
Date	199212
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : uio
State Reference	FO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	ground : parked landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 550
ASRS Report	230579
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence other other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	none taken : insufficient time
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight mia-uio. On descent into uio the pressurization was not reset in the descent. Departure flight information of 10 ft was set and the landing airport information was set plus or minus 9300 ft. On running the parking checklist the crew noted that the cabin was still at sea level pressure. At the same time the ground crew was unable to open the forward cabin door due to pressure lock. The crew then initiated manual control of the pressurization system and set approximately 2000 FPM rate of climb for the cabin. When the cabin pressure reached 4500 ft the cabin depressurized completely to 9300 ft. The probable reason that the pressurization was not reset on descent was that the crew were revising the approach procedures which are very intricate for quito. The procedure turn outbound starts at 17000 ft. This could have been a problem if an emergency evacuate/evacuation was required and the doors could not be opened immediately.

Original NASA ASRS Text

Title: FLC OF ACR LGT ACFT FAILED TO SET THE LNDG ARPT ALT IN THE ACFT PRESSURIZATION SYS RESULTING IN THE ACFT NOT BEING COMPLETELY DEPRESSURIZED WHEN AN ATTEMPT WAS MADE TO OPEN THE CABIN DOOR AFTER LNDG.

Narrative: FLT MIA-UIO. ON DSCNT INTO UIO THE PRESSURIZATION WAS NOT RESET IN THE DSCNT. DEP FLT INFO OF 10 FT WAS SET AND THE LNDG ARPT INFO WAS SET PLUS OR MINUS 9300 FT. ON RUNNING THE PARKING CHKLIST THE CREW NOTED THAT THE CABIN WAS STILL AT SEA LEVEL PRESSURE. AT THE SAME TIME THE GND CREW WAS UNABLE TO OPEN THE FORWARD CABIN DOOR DUE TO PRESSURE LOCK. THE CREW THEN INITIATED MANUAL CTL OF THE PRESSURIZATION SYS AND SET APPROX 2000 FPM RATE OF CLB FOR THE CABIN. WHEN THE CABIN PRESSURE REACHED 4500 FT THE CABIN DEPRESSURIZED COMPLETELY TO 9300 FT. THE PROBABLE REASON THAT THE PRESSURIZATION WAS NOT RESET ON DSCNT WAS THAT THE CREW WERE REVISING THE APCH PROCS WHICH ARE VERY INTRICATE FOR QUITO. THE PROC TURN OUTBOUND STARTS AT 17000 FT. THIS COULD HAVE BEEN A PROB IF AN EMER EVAC WAS REQUIRED AND THE DOORS COULD NOT BE OPENED IMMEDIATELY.

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.