Medium large transport on initial climb has master caution light and air- conditioning light activat...

Attributes
ACN	257767
Time
Date	199311
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : slt airport : slc
State Reference	UT
Altitude	msl bound lower : 8000 msl bound upper : 9500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 160 flight time total : 8000 flight time type : 400
ASRS Report	257767
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On climb out from slc at approximately 8000 ft MSL, we received a master caution light plus an 'air-conditioning' light on the annunciator panel. Upon checking the overhead pressurization panel, we found the 'automatic fail' light illuminated and the standby light illuminated. Cabin rate of climb indicated approximately 1500 FPM. We manually selected standby with the mode selector, verified the outflow valve was closed, both packs were on, and both engine bleed valves were open. There were no other caution lights illuminated including door lights. Cabin continued to climb and was at approximately 9500 ft. We requested an immediate level off and a vector back to slc for landing. This was approved. We made an overweight landing at slc at 115000 pounds. On taxi in, mechanic informed us that the forward entry door was not completely closed along the rear edge. Again we checked the door annunciator panel. No lights were illuminated. And no time during taxi or takeoff did we hear any unusual noises. The flight attendant reported to me that everything appeared normal until the takeoff roll, when it got quite noisy, but she said the door still looked closed.

Original NASA ASRS Text

Title: MLG ON INITIAL CLB HAS MASTER CAUTION LIGHT AND AIR- CONDITIONING LIGHT ACTIVATE. UNABLE TO PRESSURIZE ACFT.

Narrative: ON CLB OUT FROM SLC AT APPROX 8000 FT MSL, WE RECEIVED A MASTER CAUTION LIGHT PLUS AN 'AIR-CONDITIONING' LIGHT ON THE ANNUNCIATOR PANEL. UPON CHKING THE OVERHEAD PRESSURIZATION PANEL, WE FOUND THE 'AUTO FAIL' LIGHT ILLUMINATED AND THE STANDBY LIGHT ILLUMINATED. CABIN RATE OF CLB INDICATED APPROX 1500 FPM. WE MANUALLY SELECTED STANDBY WITH THE MODE SELECTOR, VERIFIED THE OUTFLOW VALVE WAS CLOSED, BOTH PACKS WERE ON, AND BOTH ENG BLEED VALVES WERE OPEN. THERE WERE NO OTHER CAUTION LIGHTS ILLUMINATED INCLUDING DOOR LIGHTS. CABIN CONTINUED TO CLB AND WAS AT APPROX 9500 FT. WE REQUESTED AN IMMEDIATE LEVEL OFF AND A VECTOR BACK TO SLC FOR LNDG. THIS WAS APPROVED. WE MADE AN OVERWT LNDG AT SLC AT 115000 LBS. ON TAXI IN, MECH INFORMED US THAT THE FORWARD ENTRY DOOR WAS NOT COMPLETELY CLOSED ALONG THE REAR EDGE. AGAIN WE CHKED THE DOOR ANNUNCIATOR PANEL. NO LIGHTS WERE ILLUMINATED. AND NO TIME DURING TAXI OR TKOF DID WE HEAR ANY UNUSUAL NOISES. THE FLT ATTENDANT RPTED TO ME THAT EVERYTHING APPEARED NORMAL UNTIL THE TKOF ROLL, WHEN IT GOT QUITE NOISY, BUT SHE SAID THE DOOR STILL LOOKED CLOSED.

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.

Medium large transport on initial climb has master caution light and air- conditioning light activate. Unable to pressurize aircraft.