Cabin pressure of medium large transport in climb went from automatic control to standby. Pressure in cabin climbed with aircraft. Flight crew used manual control to close outflow valve, regained some control. Returned to departure airport and landed. A cabin door partially unlatched.

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Attributes
ACN	108491
Time
Date	198904
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : clt
State Reference	NC
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude descent : approach 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 : cfi pilot : atp
Experience	flight time last 90 days : 72 flight time total : 14000 flight time type : 1000
ASRS Report	108491
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At approximately 3000' cabin controller went from automatic to standby. Saw cabin climbing with aircraft. Manual closed outflow valve and got some control over cabin. Returned to clt. Also, transponder when out on #1. Lost time with approach control while #2 transponder warmed up and started to work. Ended up being vectored on long final because of transponder. Returned to clt. Found forward entry door top latch not fully closed. At no time did we have a forward entry door light. Refuel after mechanic checked doors and took off for phl. I talked to company after gate agent checked outside of door to see if it looked all right in close position. Talked to F/a supervisor about F/a--tell crew if they have a problem with the door closing. Since we were returning to climb, seemed like approach control could have skin paint up while we got transponder problem cleared up.

Original NASA ASRS Text

Title: CABIN PRESSURE OF MLG IN CLIMB WENT FROM AUTO CONTROL TO STANDBY. PRESSURE IN CABIN CLIMBED WITH ACFT. FLT CREW USED MANUAL CONTROL TO CLOSE OUTFLOW VALVE, REGAINED SOME CONTROL. RETURNED TO DEP ARPT AND LANDED. A CABIN DOOR PARTIALLY UNLATCHED.

Narrative: AT APPROX 3000' CABIN CTLR WENT FROM AUTO TO STANDBY. SAW CABIN CLBING WITH ACFT. MANUAL CLOSED OUTFLOW VALVE AND GOT SOME CONTROL OVER CABIN. RETURNED TO CLT. ALSO, XPONDER WHEN OUT ON #1. LOST TIME WITH APCH CTL WHILE #2 XPONDER WARMED UP AND STARTED TO WORK. ENDED UP BEING VECTORED ON LONG FINAL BECAUSE OF XPONDER. RETURNED TO CLT. FOUND FORWARD ENTRY DOOR TOP LATCH NOT FULLY CLOSED. AT NO TIME DID WE HAVE A FORWARD ENTRY DOOR LIGHT. REFUEL AFTER MECH CHKED DOORS AND TOOK OFF FOR PHL. I TALKED TO COMPANY AFTER GATE AGENT CHKED OUTSIDE OF DOOR TO SEE IF IT LOOKED ALL RIGHT IN CLOSE POS. TALKED TO F/A SUPVR ABOUT F/A--TELL CREW IF THEY HAVE A PROB WITH THE DOOR CLOSING. SINCE WE WERE RETURNING TO CLB, SEEMED LIKE APCH CTL COULD HAVE SKIN PAINT UP WHILE WE GOT XPONDER PROB CLRED UP.

Data retrieved from NASA's ASRS site as of August 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.