A DC9-30 experiences a stall warning, stick shaker event on approach to pit airport. It had previously encountered moderate to severe icing. After some power and aircraft pitch adjustments, the stall warning fail light came on.

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Attributes
ACN	391550
Time
Date	199801
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	msl bound lower : 3500 msl bound upper : 3500
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : pit
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 14000 flight time type : 8000
ASRS Report	391550
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe inflight encounter other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While on approach, after descending to visual conditions (from moderate to severe icing conditions 5000-7000 ft), stall stick shakers activated at 145 KTS with flaps/slats 40 degrees. After 'firewall power' was applied, we attempted to establish a shallow climb, but shakers activated again. Aircraft did not feel like it was in a stall condition. It flew level ok with an increased speed. A stall indicator failure came on after 5 seconds.

Original NASA ASRS Text

Title: A DC9-30 EXPERIENCES A STALL WARNING, STICK SHAKER EVENT ON APCH TO PIT ARPT. IT HAD PREVIOUSLY ENCOUNTERED MODERATE TO SEVERE ICING. AFTER SOME PWR AND ACFT PITCH ADJUSTMENTS, THE STALL WARNING FAIL LIGHT CAME ON.

Narrative: WHILE ON APCH, AFTER DSNDING TO VISUAL CONDITIONS (FROM MODERATE TO SEVERE ICING CONDITIONS 5000-7000 FT), STALL STICK SHAKERS ACTIVATED AT 145 KTS WITH FLAPS/SLATS 40 DEGS. AFTER 'FIREWALL PWR' WAS APPLIED, WE ATTEMPTED TO ESTABLISH A SHALLOW CLB, BUT SHAKERS ACTIVATED AGAIN. ACFT DID NOT FEEL LIKE IT WAS IN A STALL CONDITION. IT FLEW LEVEL OK WITH AN INCREASED SPD. A STALL INDICATOR FAILURE CAME ON AFTER 5 SECONDS.

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.