Return land in a B737-300 mandated by a non activated outflow valve. Aircraft unable to pressurize.

Attributes
ACN	307183
Time
Date	199506
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	307183
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

While performing maintenance on aircraft in dtw, outflow valve was deactivated for safety procedures while working on aircraft lavatory system. Outflow valve was not reactivated.

Original NASA ASRS Text

Title: RETURN LAND IN A B737-300 MANDATED BY A NON ACTIVATED OUTFLOW VALVE. ACFT UNABLE TO PRESSURIZE.

Narrative: WHILE PERFORMING MAINT ON ACFT IN DTW, OUTFLOW VALVE WAS DEACTIVATED FOR SAFETY PROCS WHILE WORKING ON ACFT LAVATORY SYS. OUTFLOW VALVE WAS NOT REACTIVATED.

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.