An MD83 flight crew leaves their assigned altitude prior to receiving their requested altitude assignment during a speed bleed at FL310 with signs of engine icing while on frequency with ZMP, mn.

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Attributes
ACN	484019
Time
Date	200007
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zmp.artcc
State Reference	MN
Altitude	msl bound lower : 28000 msl bound upper : 31000
Environment
Flight Conditions	IMC
Weather Elements	Ice
Light	Night
Aircraft 1
Controlling Facilities	artcc : zmp.artcc
Operator	common carrier : air carrier
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 400
ASRS Report	484019
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : company policies non adherence : published procedure other anomaly other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance Weather Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We had been in and out of clouds at FL310. We were using engine anti-ice when necessary. There was no evidence of any ice accumulation. The first officer left the cockpit to use the lavatory, then came back with my crew meal. After a few mins, we noticed the aft had slowed to about 220 KTS and the throttles were split. The right engine was not developing cruise thrust. It was apparent we would not be able to accelerate so I told center we wanted to descend to FL280. The controller gave us a frequency change, but the first officer had already started down at my request. The next controller approved FL280. Shortly after the descent, I turned on the ignition and anti-ice. The right engine indications returned to normal. We stayed at FL280 for a little while, then returned to FL310. I am going to be more aggressive using anti-ice in the future and much more vigilant monitoring the instruments during cruise.

Original NASA ASRS Text

Title: AN MD83 FLC LEAVES THEIR ASSIGNED ALT PRIOR TO RECEIVING THEIR REQUESTED ALT ASSIGNMENT DURING A SPD BLEED AT FL310 WITH SIGNS OF ENG ICING WHILE ON FREQ WITH ZMP, MN.

Narrative: WE HAD BEEN IN AND OUT OF CLOUDS AT FL310. WE WERE USING ENG ANTI-ICE WHEN NECESSARY. THERE WAS NO EVIDENCE OF ANY ICE ACCUMULATION. THE FO LEFT THE COCKPIT TO USE THE LAVATORY, THEN CAME BACK WITH MY CREW MEAL. AFTER A FEW MINS, WE NOTICED THE AFT HAD SLOWED TO ABOUT 220 KTS AND THE THROTTLES WERE SPLIT. THE R ENG WAS NOT DEVELOPING CRUISE THRUST. IT WAS APPARENT WE WOULD NOT BE ABLE TO ACCELERATE SO I TOLD CTR WE WANTED TO DSND TO FL280. THE CTLR GAVE US A FREQ CHANGE, BUT THE FO HAD ALREADY STARTED DOWN AT MY REQUEST. THE NEXT CTLR APPROVED FL280. SHORTLY AFTER THE DSCNT, I TURNED ON THE IGNITION AND ANTI-ICE. THE R ENG INDICATIONS RETURNED TO NORMAL. WE STAYED AT FL280 FOR A LITTLE WHILE, THEN RETURNED TO FL310. I AM GOING TO BE MORE AGGRESSIVE USING ANTI-ICE IN THE FUTURE AND MUCH MORE VIGILANT MONITORING THE INSTS DURING CRUISE.

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.