An air carrier flight crew on a post major maintenance test flight find that they were unable to regain control of the outflow valve for the pressurization system and they have to perform an emergency descent and return to tul.

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Attributes
ACN	386268
Time
Date	199711
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : tul
State Reference	OK
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	386268
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

While on functional flight test following heavy 'C' maintenance, immediately following the maximum differential pressurization check, the cabin pressure relief valves would not reset. An immediate descent to 10000 ft was made and returned directly to tul for landing. Postflt inspection revealed foreign object damage blocking relief valves.

Original NASA ASRS Text

Title: AN ACR FLC ON A POST MAJOR MAINT TEST FLT FIND THAT THEY WERE UNABLE TO REGAIN CTL OF THE OUTFLOW VALVE FOR THE PRESSURIZATION SYS AND THEY HAVE TO PERFORM AN EMER DSCNT AND RETURN TO TUL.

Narrative: WHILE ON FUNCTIONAL FLT TEST FOLLOWING HVY 'C' MAINT, IMMEDIATELY FOLLOWING THE MAX DIFFERENTIAL PRESSURIZATION CHK, THE CABIN PRESSURE RELIEF VALVES WOULD NOT RESET. AN IMMEDIATE DSCNT TO 10000 FT WAS MADE AND RETURNED DIRECTLY TO TUL FOR LNDG. POSTFLT INSPECTION REVEALED FOREIGN OBJECT DAMAGE BLOCKING RELIEF VALVES.

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.