A DC9-30 immediately after takeoff declared an emergency and diverted due to cabin pressure failure caused by a lower fuselage compartment door not closed and locked.

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Attributes
ACN	417694
Time
Date	199810
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zzz airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	417694
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Upon completion of line check of air carrier DC9-30 aircraft xyz, I entered the lower east&east compartment to troubleshoot an external power MEL reference log page xzyz. I left the door open expecting to come back to change parts. After several hours troubleshooting, I discovered it worked ok and didn't need parts. But I forgot the door was open. The flight crew took off that morning and could not pressurize the aircraft. Declared an emergency, landed, and returned to the gate. There were no personal injuries or aircraft damage. The crew then discovered the door open and the light in cockpit was inoperative. The switch was placed on MEL by ZZZ mechanic and the aircraft was returned to service with no further delay. Due to the heavy workload and lack of manpwr, I didn't doublechk my work, which resulted in this incident.

Original NASA ASRS Text

Title: A DC9-30 IMMEDIATELY AFTER TKOF DECLARED AN EMER AND DIVERTED DUE TO CABIN PRESSURE FAILURE CAUSED BY A LOWER FUSELAGE COMPARTMENT DOOR NOT CLOSED AND LOCKED.

Narrative: UPON COMPLETION OF LINE CHK OF ACR DC9-30 ACFT XYZ, I ENTERED THE LOWER E&E COMPARTMENT TO TROUBLESHOOT AN EXTERNAL PWR MEL REF LOG PAGE XZYZ. I LEFT THE DOOR OPEN EXPECTING TO COME BACK TO CHANGE PARTS. AFTER SEVERAL HRS TROUBLESHOOTING, I DISCOVERED IT WORKED OK AND DIDN'T NEED PARTS. BUT I FORGOT THE DOOR WAS OPEN. THE FLC TOOK OFF THAT MORNING AND COULD NOT PRESSURIZE THE ACFT. DECLARED AN EMER, LANDED, AND RETURNED TO THE GATE. THERE WERE NO PERSONAL INJURIES OR ACFT DAMAGE. THE CREW THEN DISCOVERED THE DOOR OPEN AND THE LIGHT IN COCKPIT WAS INOP. THE SWITCH WAS PLACED ON MEL BY ZZZ MECH AND THE ACFT WAS RETURNED TO SVC WITH NO FURTHER DELAY. DUE TO THE HVY WORKLOAD AND LACK OF MANPWR, I DIDN'T DOUBLECHK MY WORK, WHICH RESULTED IN THIS 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.