<< >> NASA ASRS Report 952830, June 2011

An MD80 was unable to maintain pressurization and wing anti-ice at FL360. An emergency descent was made until pressurization control was re-established below FL200 at which altitude the flight continued to destination. Passenger O2 did not activate.

Attributes
ACN	952830
Time
Date	201106
Local Time Of Day	0601-1200
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Aircraft 1
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	First Officer
Person 2
Function	Captain
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

At FL360; in thin cloud tops with anti-icing on; the pressurization flow light came on twice intermittently. Anti-icing was turned off and a descent requested with ATC. The pressurization flow light came on again and the cabin began to climb. The crew performed the critical action items and initiated an emergency descent. An emergency was declared with ATC. The cabin altitude warning light came on briefly and then went out as the cabin began to descend. Passenger oxygen masks did not deploy. At FL180 the cabin had descended and stabilized and the pressurization system was operating normally. The emergency was canceled with ATC and the flight continued on to chicago at FL200 with the pressurization controller in stby.

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Original NASA ASRS Text

Title: An MD80 was unable to maintain pressurization and wing anti-ice at FL360. An emergency descent was made until pressurization control was re-established below FL200 at which altitude the flight continued to destination. Passenger O2 did not activate.

Narrative: At FL360; in thin cloud tops with anti-icing on; the pressurization flow light came on twice intermittently. Anti-icing was turned off and a descent requested with ATC. The pressurization flow light came on again and the cabin began to climb. The crew performed the critical action items and initiated an emergency descent. An emergency was declared with ATC. The cabin altitude warning light came on briefly and then went out as the cabin began to descend. Passenger oxygen masks did not deploy. At FL180 the cabin had descended and stabilized and the pressurization system was operating normally. The emergency was canceled with ATC and the flight continued on to Chicago at FL200 with the pressurization controller in STBY.

Data retrieved from NASA's ASRS site as of April 2012 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.