Md-82 pilot experiences a dual pack failure at FL270 shortly after tail deicing was selected. A desc...

Narrative:

While cruising at 27000 feet in icing conditions; both packs failed shortly after tail deicing was selected. A descent to a lower altitude was initiated. The packs resumed normal operations at about 16000 feet. We had at this time exited icing conditions. All deicing systems were engaged prior to the event and had been operating for about 20 - 25 minutes when failures occurred. Engines were operating at normal power for flight at 27000 feet and 280 knots. Cabin reached an altitude of 7000 - 7500; before pressurization was restored. No abnormal deicing annunciators lights were observed until after pack failure. I believe the pressurization flow annunciator was the only abnormal light on; as it should have been on. Remainder of the flight was normal with packs on and anti-icing turned off.

Original NASA ASRS Text

Title: MD-82 pilot experiences a dual pack failure at FL270 shortly after tail deicing was selected. A descent to a lower altitude is initiated and the packs return to normal operation passing 16;000 feet.

Narrative: While cruising at 27000 feet in icing conditions; both packs failed shortly after tail deicing was selected. A descent to a lower altitude was initiated. The packs resumed normal operations at about 16000 feet. We had at this time exited icing conditions. All deicing systems were engaged prior to the event and had been operating for about 20 - 25 minutes when failures occurred. Engines were operating at normal power for flight at 27000 feet and 280 knots. Cabin reached an altitude of 7000 - 7500; before pressurization was restored. No abnormal deicing annunciators lights were observed until after pack failure. I believe the pressurization flow annunciator was the only abnormal light on; as it should have been on. Remainder of the flight was normal with packs on and anti-icing turned off.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1202233
Time
Date	201409
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

Md-82 pilot experiences a dual pack failure at FL270 shortly after tail deicing was selected. A descent to a lower altitude is initiated and the packs return to normal operation passing 16;000 feet.