Narrative:

Aircraft arrived late from previous flight due to WX. Maintenance log item had been entered by previous crew concerning flap/gear warning system. Departed our flight after repairs completed. After takeoff, a loud noise developed in nose area. Automatic fail light came on indicating that we were not pressurizing properly. There were no door open lights or other caution or warning lights. Elected to return to departure station. After return to gate, mechanic reported that forward electronic bay door, opened for prior maintenance, had not properly sealed. Door was inspected, adjusted, and resecured. Door warning proximity switch was adjusted and tested. We then again departed. It was subsequently determined that we may have landed approximately 1000 pounds over maximum landing weight. This may have been overlooked while all activities centered on maintenance, noise, and redispatch procedures. This situation had contributing factors of fatigue and focus on alleviating further delays by all those involved. Further review of all factors may have uncovered possible oversight/miscalculation. Further occurrences might be avoided with caution/warning note added to appropriate section of operating manuals.

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Original NASA ASRS Text

Title: A B737 FLC RETURNS LANDS WHEN UNABLE TO PRESSURIZE THEIR ACFT AT SLC, UT.

Narrative: ACFT ARRIVED LATE FROM PREVIOUS FLT DUE TO WX. MAINT LOG ITEM HAD BEEN ENTERED BY PREVIOUS CREW CONCERNING FLAP/GEAR WARNING SYS. DEPARTED OUR FLT AFTER REPAIRS COMPLETED. AFTER TKOF, A LOUD NOISE DEVELOPED IN NOSE AREA. AUTO FAIL LIGHT CAME ON INDICATING THAT WE WERE NOT PRESSURIZING PROPERLY. THERE WERE NO DOOR OPEN LIGHTS OR OTHER CAUTION OR WARNING LIGHTS. ELECTED TO RETURN TO DEP STATION. AFTER RETURN TO GATE, MECH RPTED THAT FORWARD ELECTRONIC BAY DOOR, OPENED FOR PRIOR MAINT, HAD NOT PROPERLY SEALED. DOOR WAS INSPECTED, ADJUSTED, AND RESECURED. DOOR WARNING PROX SWITCH WAS ADJUSTED AND TESTED. WE THEN AGAIN DEPARTED. IT WAS SUBSEQUENTLY DETERMINED THAT WE MAY HAVE LANDED APPROX 1000 LBS OVER MAX LNDG WT. THIS MAY HAVE BEEN OVERLOOKED WHILE ALL ACTIVITIES CTRED ON MAINT, NOISE, AND REDISPATCH PROCS. THIS SIT HAD CONTRIBUTING FACTORS OF FATIGUE AND FOCUS ON ALLEVIATING FURTHER DELAYS BY ALL THOSE INVOLVED. FURTHER REVIEW OF ALL FACTORS MAY HAVE UNCOVERED POSSIBLE OVERSIGHT/MISCALCULATION. FURTHER OCCURRENCES MIGHT BE AVOIDED WITH CAUTION/WARNING NOTE ADDED TO APPROPRIATE SECTION OF OPERATING MANUALS.

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.