Reporter asserts ice forms on underside of wing of large transport when fuel has been chilled in flight and aircraft descends into high humidity for landing.

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Attributes
ACN	127188
Time
Date	198911
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	ground : preflight
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 120 flight time total : 3500 flight time type : 600
ASRS Report	127188
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

The medium large transport advanced has a problem with ice forming on the wings. This is caused by the fuel in the wing being cooled during flight. Then, when exposed to high moisture content, ice forms on the wing. This comes loose on takeoff and can damage engine--yes, you should not take off with ice on the wing, but who expects ice on a 70 degree day at dfw with clear skies?! The company, etc, is aware of this and is working to solve the problem--however(!), if ice forms on the ground, will it not form in flight while flying in precipitation? If so, the ice cannot be de-iced from above and below the wing in flight.

Original NASA ASRS Text

Title: REPORTER ASSERTS ICE FORMS ON UNDERSIDE OF WING OF LGT WHEN FUEL HAS BEEN CHILLED IN FLT AND ACFT DESCENDS INTO HIGH HUMIDITY FOR LNDG.

Narrative: THE MLG ADVANCED HAS A PROB WITH ICE FORMING ON THE WINGS. THIS IS CAUSED BY THE FUEL IN THE WING BEING COOLED DURING FLT. THEN, WHEN EXPOSED TO HIGH MOISTURE CONTENT, ICE FORMS ON THE WING. THIS COMES LOOSE ON TKOF AND CAN DAMAGE ENG--YES, YOU SHOULD NOT TAKE OFF WITH ICE ON THE WING, BUT WHO EXPECTS ICE ON A 70 DEG DAY AT DFW WITH CLEAR SKIES?! THE COMPANY, ETC, IS AWARE OF THIS AND IS WORKING TO SOLVE THE PROB--HOWEVER(!), IF ICE FORMS ON THE GND, WILL IT NOT FORM IN FLT WHILE FLYING IN PRECIPITATION? IF SO, THE ICE CANNOT BE DE-ICED FROM ABOVE AND BELOW THE WING IN FLT.

Data retrieved from NASA's ASRS site as of August 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.