MD80 crew was unable to pressurize the aircraft after maintenance had the east&east compartment door open. No door warning light was received prior to becoming airborne.

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Attributes
ACN	533961
Time
Date	200112
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	533961
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : published procedure non adherence : company policies other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin altimeter, rate of climb, differential pressure indicator other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport none taken : detected after the fact other
Consequence	other other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Access compartment door light illuminated after takeoff. Air carrier maintenance was working in the east&east compartment before gate departure. Air carrier maintenance confirmed that the east&east door was closed and locked and east&east door light was out. We departed the gate and completed before takeoff checklist with the east&east door light out. After takeoff, we heard a loud pop sound and the east&east door light came on. We could not pressurize the aircraft. Returned for landing at ZZZ without further incident.

Original NASA ASRS Text

Title: MD80 CREW WAS UNABLE TO PRESSURIZE THE ACFT AFTER MAINT HAD THE E&E COMPARTMENT DOOR OPEN. NO DOOR WARNING LIGHT WAS RECEIVED PRIOR TO BECOMING AIRBORNE.

Narrative: ACCESS COMPARTMENT DOOR LIGHT ILLUMINATED AFTER TKOF. ACR MAINT WAS WORKING IN THE E&E COMPARTMENT BEFORE GATE DEP. ACR MAINT CONFIRMED THAT THE E&E DOOR WAS CLOSED AND LOCKED AND E&E DOOR LIGHT WAS OUT. WE DEPARTED THE GATE AND COMPLETED BEFORE TKOF CHKLIST WITH THE E&E DOOR LIGHT OUT. AFTER TKOF, WE HEARD A LOUD POP SOUND AND THE E&E DOOR LIGHT CAME ON. WE COULD NOT PRESSURIZE THE ACFT. RETURNED FOR LNDG AT ZZZ WITHOUT FURTHER INCIDENT.

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.