Main passenger doors opens during flight.

Attributes
ACN	296017
Time
Date	199502
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oma
State Reference	NE
Altitude	msl bound lower : 18000 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 11000 flight time type : 1700
ASRS Report	296017
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

At gate flight attendant had difficulty closing main cabin door, they are supposed to check alignment pins before securing the outer handle, door was assisted shut by agent from outside. EICAS page showed door closed. In climb out got passenger door message. Cabin altitude was 1200 ft. We leveled off and ran checklist. Item of 'depressurizing cabin' was skipped due to low cabin altitude, we returned to oma and landed. I am concerned that as PIC I did not ask the flight attendant to check witness marks (alignment pins) prior to pushback. Cockpit resource management good, good communications between pilots and cabin crew.

Original NASA ASRS Text

Title: MAIN PAX DOORS OPENS DURING FLT.

Narrative: AT GATE FLT ATTENDANT HAD DIFFICULTY CLOSING MAIN CABIN DOOR, THEY ARE SUPPOSED TO CHK ALIGNMENT PINS BEFORE SECURING THE OUTER HANDLE, DOOR WAS ASSISTED SHUT BY AGENT FROM OUTSIDE. EICAS PAGE SHOWED DOOR CLOSED. IN CLBOUT GOT PAX DOOR MESSAGE. CABIN ALT WAS 1200 FT. WE LEVELED OFF AND RAN CHKLIST. ITEM OF 'DEPRESSURIZING CABIN' WAS SKIPPED DUE TO LOW CABIN ALT, WE RETURNED TO OMA AND LANDED. I AM CONCERNED THAT AS PIC I DID NOT ASK THE FLT ATTENDANT TO CHK WITNESS MARKS (ALIGNMENT PINS) PRIOR TO PUSHBACK. COCKPIT RESOURCE MGMNT GOOD, GOOD COMS BTWN PLTS AND CABIN CREW.

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.