DC9 crew lost cabin pressurization in rap class east airspace.

Attributes
ACN	517917
Time
Date	200107
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : rap.airport
State Reference	SD
Altitude	msl bound lower : 9000 msl bound upper : 16000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : rca.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 150
ASRS Report	517917
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin altitude warning other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Red cabin altitude annunciator light came on climbing through 16000 ft. Descended to 9000 ft. ATC was notified and no traffic conflicts. Outflow valve indicated full closed, both packs were on. At 9000 ft, the cabin was 6000 ft. No other annunciator lights on. With dispatch concurrence through ACARS, proceeded on to msp. Uneventful landing.

Original NASA ASRS Text

Title: DC9 CREW LOST CABIN PRESSURIZATION IN RAP CLASS E AIRSPACE.

Narrative: RED CABIN ALT ANNUNCIATOR LIGHT CAME ON CLBING THROUGH 16000 FT. DSNDED TO 9000 FT. ATC WAS NOTIFIED AND NO TFC CONFLICTS. OUTFLOW VALVE INDICATED FULL CLOSED, BOTH PACKS WERE ON. AT 9000 FT, THE CABIN WAS 6000 FT. NO OTHER ANNUNCIATOR LIGHTS ON. WITH DISPATCH CONCURRENCE THROUGH ACARS, PROCEEDED ON TO MSP. UNEVENTFUL LNDG.

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.