MD80 crew had engine pt-2 probe icing and lost airspeed.

Attributes
ACN	567840
Time
Date	200212
Day	Sat
Place
Locale Reference	atc facility : mmex.artcc
State Reference	FO
Environment
Weather Elements	Ice
Light	Night
Aircraft 1
Controlling Facilities	artcc : mmex.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	567840
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	inflight encounter : weather inflight encounter other non adherence : company policies non adherence : far non adherence : published procedure other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : mach meter engine epr other flight crewa other flight crewb
Resolutory Action	flight crew : regained aircraft control none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

I turned on the lights to enhance our dining experience en route to mmgl. At the time VMC on top. I left the lights on after eating and every now and then checking outside. I could always see the stars clearly. I figured if we went IFR I would see the strobe flash. Somewhere central mexico, I noticed the EPR's split a little, so I turned on the engine anti-ice. The left engine EPR dropped so quickly to 1.2, I thought I had lost the left engine. I quickly recovered to normal. I then noticed the speed -- .67 mach. (.76 mach was set). I looked outside and we were skimming the tops of thin cirrus and picked up enough ice to coat the PF-2 probe and the engines had slowly reduced thrust while keeping the EPR's in the normal range.

Original NASA ASRS Text

Title: MD80 CREW HAD ENG PT-2 PROBE ICING AND LOST AIRSPD.

Narrative: I TURNED ON THE LIGHTS TO ENHANCE OUR DINING EXPERIENCE ENRTE TO MMGL. AT THE TIME VMC ON TOP. I LEFT THE LIGHTS ON AFTER EATING AND EVERY NOW AND THEN CHKING OUTSIDE. I COULD ALWAYS SEE THE STARS CLRLY. I FIGURED IF WE WENT IFR I WOULD SEE THE STROBE FLASH. SOMEWHERE CENTRAL MEXICO, I NOTICED THE EPR'S SPLIT A LITTLE, SO I TURNED ON THE ENG ANTI-ICE. THE L ENG EPR DROPPED SO QUICKLY TO 1.2, I THOUGHT I HAD LOST THE L ENG. I QUICKLY RECOVERED TO NORMAL. I THEN NOTICED THE SPD -- .67 MACH. (.76 MACH WAS SET). I LOOKED OUTSIDE AND WE WERE SKIMMING THE TOPS OF THIN CIRRUS AND PICKED UP ENOUGH ICE TO COAT THE PF-2 PROBE AND THE ENGS HAD SLOWLY REDUCED THRUST WHILE KEEPING THE EPR'S IN THE NORMAL RANGE.

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.