Medium large transport unable to pressurize returns to find east and east door never closed.

Attributes
ACN	252965
Time
Date	199309
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 0 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff ground : preflight landing other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 16000 flight time type : 5000
ASRS Report	252965
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 245 flight time total : 13000 flight time type : 6000
ASRS Report	252964
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

No pressurization after takeoff. Attempted standby, manual AC, manual dc system to no avail. Informed ATC and leveled at 3000 ft MSL. Checked breakers and ran appropriate checklists. No door warning lights during before start, taxi, or takeoff, either on overhead or in recall. Returned sfo, overweight landing. Advised maintenance of overweight landing and reason for return. Maintenance found open electrical compartment door. Maintenance verified that door warning system for that door was inoperative. Maintenance had been working on aircraft prior to dispatch and returned logbook to crew after flight crew walkaround approximately 5 mins prior to departure, with proper signoffs and acknowledged that aircraft was all closed up and ready to go. Maintenance MEL'ed door warning system for east/east door and performed an overweight landing inspection. Prior to second departure, maintenance discovered broken wire to door warning switch in east/east compartment and corrected the problem. Supplemental information from acn 252964: possible solution: since the door opens inward, it is impossible to see unless you look under the belly. If a red flag attached to a weight were hung down when the east/east door was opened it might prevent this door from being left open.

Original NASA ASRS Text

Title: MLG UNABLE TO PRESSURIZE RETURNS TO FIND E AND E DOOR NEVER CLOSED.

Narrative: NO PRESSURIZATION AFTER TKOF. ATTEMPTED STANDBY, MANUAL AC, MANUAL DC SYS TO NO AVAIL. INFORMED ATC AND LEVELED AT 3000 FT MSL. CHKED BREAKERS AND RAN APPROPRIATE CHKLISTS. NO DOOR WARNING LIGHTS DURING BEFORE START, TAXI, OR TKOF, EITHER ON OVERHEAD OR IN RECALL. RETURNED SFO, OVERWT LNDG. ADVISED MAINT OF OVERWT LNDG AND REASON FOR RETURN. MAINT FOUND OPEN ELECTRICAL COMPARTMENT DOOR. MAINT VERIFIED THAT DOOR WARNING SYS FOR THAT DOOR WAS INOP. MAINT HAD BEEN WORKING ON ACFT PRIOR TO DISPATCH AND RETURNED LOGBOOK TO CREW AFTER FLC WALKAROUND APPROX 5 MINS PRIOR TO DEP, WITH PROPER SIGNOFFS AND ACKNOWLEDGED THAT ACFT WAS ALL CLOSED UP AND READY TO GO. MAINT MEL'ED DOOR WARNING SYS FOR E/E DOOR AND PERFORMED AN OVERWT LNDG INSPECTION. PRIOR TO SECOND DEP, MAINT DISCOVERED BROKEN WIRE TO DOOR WARNING SWITCH IN E/E COMPARTMENT AND CORRECTED THE PROB. SUPPLEMENTAL INFO FROM ACN 252964: POSSIBLE SOLUTION: SINCE THE DOOR OPENS INWARD, IT IS IMPOSSIBLE TO SEE UNLESS YOU LOOK UNDER THE BELLY. IF A RED FLAG ATTACHED TO A WT WERE HUNG DOWN WHEN THE E/E DOOR WAS OPENED IT MIGHT PREVENT THIS DOOR FROM BEING LEFT OPEN.

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.