Ice accretion and subsequent ice shedding into engine cores during flight can adversely affect engine performance and damage engine components.
Ice buildup may be within tolerance for a time, but it only takes a few short minutes for
ice accretion to become extreme and urgent.
In view of the serious threats that
ice accretion would impose on flight safety, ice protection methods must be applied to prevent or control the
ice accretion.
Yet the phenomenon, known as engine core
ice accretion, has happened more than 150 times since 1988--frequently enough to attract the attention of NASA aviation safety experts.
Bank angle plus
ice accretion would have given the airplane a higher stall speed.
Contributions come from a variety of organizations including NASA, Boeing Aircraft, and Pennsylvania State University, and address aspects of the issue such as fluid dynamics, observational technology, hydrophobic coatings, interaction of meteorological conditions with wing shapes, and a variety of
ice accretion test methods.
Conductor galloping represents a classical motion instability mechanism in the steady flow over a noncircular cross section caused by
ice accretion on the conductor.
Currently there are two main approaches to deal with the
ice accretion problem.