Flight crew of B737-400 encounter icing conditions near tou. Climb out of adverse conditions but lea...

Attributes
ACN	637130
Time
Date	200411
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : tou.vortac
State Reference	BC
Altitude	msl single value : 24000
Environment
Weather Elements	Ice
Light	Night
Aircraft 1
Controlling Facilities	artcc : czvr.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : dca.tower
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	637130
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	637112
Events
Anomaly	inflight encounter : weather inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Weather
Primary Problem	Weather

Narrative:

Flight planned for cruise at FL240 because of turbulence at FL310. Entered a cloud deck at FL240 after passing tatoosh VOR. Engine anti-ice was on prior to entering the clouds and the WX radar was on but we were not painting any precipitation. Noticed ice build up on the wings, put wing anti-ice on until wings were clean. A short time later, checked wings again and saw ice starting to build up. Put wing anti-ice on and saw ice building up around the left/right-1 windows. Requested a climb to FL310 to get out of the ice conditions. The climb was started approximately 100 NM prior to the pryce fix on the flight plan. There was not any abnormal engine indications. Passing through FL280, we were out of the icing conditions. We told ATC about the ice conditions. We forgot to pass this information on to dispatch, but it was passed on to ATC. After arrival at anchorage airport, I was told that both of our engines had received FOD. Throughout our flight, we always had normal engine indications. There was not any abnormal engine indications. The first officer and I did not hear any loud noises or bangs. The flight attendants did not report any loud noises or bangs throughout the flight.

Original NASA ASRS Text

Title: FLT CREW OF B737-400 ENCOUNTER ICING CONDITIONS NEAR TOU. CLB OUT OF ADVERSE CONDITIONS BUT LEARN ON LNDG THAT BOTH ENGS' COMPRESSOR SECTIONS WERE DAMAGED BY ICE.

Narrative: FLT PLANNED FOR CRUISE AT FL240 BECAUSE OF TURB AT FL310. ENTERED A CLOUD DECK AT FL240 AFTER PASSING TATOOSH VOR. ENG ANTI-ICE WAS ON PRIOR TO ENTERING THE CLOUDS AND THE WX RADAR WAS ON BUT WE WERE NOT PAINTING ANY PRECIP. NOTICED ICE BUILD UP ON THE WINGS, PUT WING ANTI-ICE ON UNTIL WINGS WERE CLEAN. A SHORT TIME LATER, CHKED WINGS AGAIN AND SAW ICE STARTING TO BUILD UP. PUT WING ANTI-ICE ON AND SAW ICE BUILDING UP AROUND THE L/R-1 WINDOWS. REQUESTED A CLB TO FL310 TO GET OUT OF THE ICE CONDITIONS. THE CLB WAS STARTED APPROX 100 NM PRIOR TO THE PRYCE FIX ON THE FLT PLAN. THERE WAS NOT ANY ABNORMAL ENG INDICATIONS. PASSING THROUGH FL280, WE WERE OUT OF THE ICING CONDITIONS. WE TOLD ATC ABOUT THE ICE CONDITIONS. WE FORGOT TO PASS THIS INFO ON TO DISPATCH, BUT IT WAS PASSED ON TO ATC. AFTER ARR AT ANCHORAGE ARPT, I WAS TOLD THAT BOTH OF OUR ENGS HAD RECEIVED FOD. THROUGHOUT OUR FLT, WE ALWAYS HAD NORMAL ENG INDICATIONS. THERE WAS NOT ANY ABNORMAL ENG INDICATIONS. THE FO AND I DID NOT HEAR ANY LOUD NOISES OR BANGS. THE FLT ATTENDANTS DID NOT RPT ANY LOUD NOISES OR BANGS THROUGHOUT THE FLT.

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.

Flight crew of B737-400 encounter icing conditions near tou. Climb out of adverse conditions but learn on landing that both engines' compressor sections were damaged by ice.