Aircraft equipment problem. Automatic pressurization control failure cabin differential pressure went to maximum. Flight crew selected manual pressure control and were able to control pressure outflow valve.

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Attributes
ACN	340770
Time
Date	199607
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude other
Route In Use	enroute airway : dtw
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 8000 flight time type : 2000
ASRS Report	340770
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 6000 flight time type : 700
ASRS Report	340527
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

First officer was PF. During climb out, I noticed cabin differential pressure maxed out. Unable to control cabin in automatic mode. Reverted to manual mode to open outflow valve. Did not declare an emergency, returned to dtw.

Original NASA ASRS Text

Title: ACFT EQUIP PROB. AUTO PRESSURIZATION CTL FAILURE CABIN DIFFERENTIAL PRESSURE WENT TO MAX. FLC SELECTED MANUAL PRESSURE CTL AND WERE ABLE TO CTL PRESSURE OUTFLOW VALVE.

Narrative: FO WAS PF. DURING CLBOUT, I NOTICED CABIN DIFFERENTIAL PRESSURE MAXED OUT. UNABLE TO CTL CABIN IN AUTO MODE. REVERTED TO MANUAL MODE TO OPEN OUTFLOW VALVE. DID NOT DECLARE AN EMER, RETURNED TO DTW.

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.