B737 flight crew returns to land at slc when unable to pressurize.

Attributes
ACN	437201
Time
Date	199905
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : slc.airport
State Reference	UT
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : slc.tower tower : dtw.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 60 flight time total : 4000 flight time type : 800
ASRS Report	437201
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : company policies
Independent Detector	other flight crewa other flight crewb other other : 4
Resolutory Action	controller : issued new clearance flight crew : landed as precaution
Consequence	other
Factors
Maintenance	performance deficiency : repair
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

We were waiting to fly from slc to geg. The plane was late due to WX. Repairs were made on gear warning system and we departed after they were finished. After takeoff, a loud noise came from the nose of the aircraft. Autofail light and air conditioning master caution light came on. No other lights were illuminated on the master caution display. The airplane did not pressurize and we elected to return to slc. We entered the traffic pattern under tower control, accomplished all checklists, and landed. On our return to the gate, the mechanic reported that the electronic bay door had not sealed correctly after being opened for the previous maintenance. Door was inspected and secured. Door warning light was adjusted and we left. We subsequently determined that we had landed about 1100 pounds over maximum landing weight and should have had an inspection before departure.

Original NASA ASRS Text

Title: B737 FLC RETURNS TO LAND AT SLC WHEN UNABLE TO PRESSURIZE.

Narrative: WE WERE WAITING TO FLY FROM SLC TO GEG. THE PLANE WAS LATE DUE TO WX. REPAIRS WERE MADE ON GEAR WARNING SYS AND WE DEPARTED AFTER THEY WERE FINISHED. AFTER TKOF, A LOUD NOISE CAME FROM THE NOSE OF THE ACFT. AUTOFAIL LIGHT AND AIR CONDITIONING MASTER CAUTION LIGHT CAME ON. NO OTHER LIGHTS WERE ILLUMINATED ON THE MASTER CAUTION DISPLAY. THE AIRPLANE DID NOT PRESSURIZE AND WE ELECTED TO RETURN TO SLC. WE ENTERED THE TFC PATTERN UNDER TWR CTL, ACCOMPLISHED ALL CHKLISTS, AND LANDED. ON OUR RETURN TO THE GATE, THE MECH RPTED THAT THE ELECTRONIC BAY DOOR HAD NOT SEALED CORRECTLY AFTER BEING OPENED FOR THE PREVIOUS MAINT. DOOR WAS INSPECTED AND SECURED. DOOR WARNING LIGHT WAS ADJUSTED AND WE LEFT. WE SUBSEQUENTLY DETERMINED THAT WE HAD LANDED ABOUT 1100 LBS OVER MAX LNDG WT AND SHOULD HAVE HAD AN INSPECTION BEFORE DEP.

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.