First officer of an medium large transport set the aircraft pressurization to the wrong altitude whi...

Attributes
ACN	364245
Time
Date	199703
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zau tower : phx
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	other other : other pilot : atp
Experience	flight time last 90 days : 10 flight time total : 2300 flight time type : 7
ASRS Report	364245
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was the PF as the first officer of a major scheduled airline. This was my second day flying with the company. I was on my IOE with a lca in the left seat as captain. This was my second flight ever in this type and my second day flying as a civilian (all other flying was military transport, 3-MAN crew). On our taxi-in at ord for a quick-turn, my captain was explaining to me how to get set up for departure to keep ahead of the airplane. He had me set the pressurization panel for the next leg while we were taxiing in. He told me to set in a field elevation of 1200 ft. I erroneously set in 12000 ft, (10000 ft too high). After the turn, once we reached cruise altitude, we received the cabin altitude warning horn -- we donned oxygen and complied with the emergency procedure. During troubleshooting, we realized my mistake and took corrective action. The cabin altitude never got above 10500-11000 ft. The masks in the passenger cabin did not deploy. The flight attendants were notified. The time above 10000 ft was about 5 mins. We had a pregnant flight attendant join us in the cabin and don oxygen during the entire episode. We got the cabin altitude under control and landed safely at our destination. ATC and the rest of the passenger were not notified. Contributing factors were: high workload on taxi in to major hub, failure to verify setting, unfamiliarity with the system, low time on the aircraft, mental overload and failure to prioritize tasks and thoroughly verify settings by myself.

Original NASA ASRS Text

Title: FO OF AN MLG SET THE ACFT PRESSURIZATION TO THE WRONG ALT WHICH CAUSED THE CABIN ALT WARNING TO SOUND AFTER LEVELING OFF AT CRUISE ALT. THE PAX MASKS DID NOT DEPLOY.

Narrative: I WAS THE PF AS THE FO OF A MAJOR SCHEDULED AIRLINE. THIS WAS MY SECOND DAY FLYING WITH THE COMPANY. I WAS ON MY IOE WITH A LCA IN THE L SEAT AS CAPT. THIS WAS MY SECOND FLT EVER IN THIS TYPE AND MY SECOND DAY FLYING AS A CIVILIAN (ALL OTHER FLYING WAS MIL TRANSPORT, 3-MAN CREW). ON OUR TAXI-IN AT ORD FOR A QUICK-TURN, MY CAPT WAS EXPLAINING TO ME HOW TO GET SET UP FOR DEP TO KEEP AHEAD OF THE AIRPLANE. HE HAD ME SET THE PRESSURIZATION PANEL FOR THE NEXT LEG WHILE WE WERE TAXIING IN. HE TOLD ME TO SET IN A FIELD ELEVATION OF 1200 FT. I ERRONEOUSLY SET IN 12000 FT, (10000 FT TOO HIGH). AFTER THE TURN, ONCE WE REACHED CRUISE ALT, WE RECEIVED THE CABIN ALT WARNING HORN -- WE DONNED OXYGEN AND COMPLIED WITH THE EMER PROC. DURING TROUBLESHOOTING, WE REALIZED MY MISTAKE AND TOOK CORRECTIVE ACTION. THE CABIN ALT NEVER GOT ABOVE 10500-11000 FT. THE MASKS IN THE PAX CABIN DID NOT DEPLOY. THE FLT ATTENDANTS WERE NOTIFIED. THE TIME ABOVE 10000 FT WAS ABOUT 5 MINS. WE HAD A PREGNANT FLT ATTENDANT JOIN US IN THE CABIN AND DON OXYGEN DURING THE ENTIRE EPISODE. WE GOT THE CABIN ALT UNDER CTL AND LANDED SAFELY AT OUR DEST. ATC AND THE REST OF THE PAX WERE NOT NOTIFIED. CONTRIBUTING FACTORS WERE: HIGH WORKLOAD ON TAXI IN TO MAJOR HUB, FAILURE TO VERIFY SETTING, UNFAMILIARITY WITH THE SYS, LOW TIME ON THE ACFT, MENTAL OVERLOAD AND FAILURE TO PRIORITIZE TASKS AND THOROUGHLY VERIFY SETTINGS BY MYSELF.

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.

First officer of an medium large transport set the aircraft pressurization to the wrong altitude which caused the cabin altitude warning to sound after leveling off at cruise altitude. The passenger masks did not deploy.