Air carrier medium large transport fails to pressurize after takeoff.

Attributes
ACN	174350
Time
Date	199103
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oma
State Reference	NE
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oma
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff ground : preflight other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 250 flight time type : 1500
ASRS Report	174350
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After takeoff, the aircraft would not pressurize. The flight service manager quickly came forward and said that a seat belt strap had been closed in the left aft service door. I notified departure that we needed to return to oma for landing, and we did so. At the gate, we checked and found that the door did not have a strap closed in it, but that the door had not been closed properly by the cleaners. The door appeared to be closed, all door lights out and working properly when tested, but the door was not actually closed. We cycled the door several times, checking the mechanism, the seal and the operation of the related door light. Everything worked properly normally. We called for fuel, were redispatched by the company and departed for den. In den I was asked to make a maintenance log book entry as an advisory precaution, and I did so. The mechanics checked everything that we had checked in oma and found nothing abnormal or broken. The aircraft was sighted off and sent on another flight.

Original NASA ASRS Text

Title: ACR MLG FAILS TO PRESSURIZE AFTER TKOF.

Narrative: AFTER TKOF, THE ACFT WOULD NOT PRESSURIZE. THE FLT SVC MGR QUICKLY CAME FORWARD AND SAID THAT A SEAT BELT STRAP HAD BEEN CLOSED IN THE LEFT AFT SVC DOOR. I NOTIFIED DEP THAT WE NEEDED TO RETURN TO OMA FOR LNDG, AND WE DID SO. AT THE GATE, WE CHKED AND FOUND THAT THE DOOR DID NOT HAVE A STRAP CLOSED IN IT, BUT THAT THE DOOR HAD NOT BEEN CLOSED PROPERLY BY THE CLEANERS. THE DOOR APPEARED TO BE CLOSED, ALL DOOR LIGHTS OUT AND WORKING PROPERLY WHEN TESTED, BUT THE DOOR WAS NOT ACTUALLY CLOSED. WE CYCLED THE DOOR SEVERAL TIMES, CHKING THE MECHANISM, THE SEAL AND THE OPERATION OF THE RELATED DOOR LIGHT. EVERYTHING WORKED PROPERLY NORMALLY. WE CALLED FOR FUEL, WERE REDISPATCHED BY THE COMPANY AND DEPARTED FOR DEN. IN DEN I WAS ASKED TO MAKE A MAINT LOG BOOK ENTRY AS AN ADVISORY PRECAUTION, AND I DID SO. THE MECHS CHKED EVERYTHING THAT WE HAD CHKED IN OMA AND FOUND NOTHING ABNORMAL OR BROKEN. THE ACFT WAS SIGHTED OFF AND SENT ON ANOTHER FLT.

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.