(Source: Flight Global & FAA Press  Release)

The FAA today finalised amended certification standards that will require makers of transport category aircraft to either have icing protection systems that automatically activate or provide a method to alert pilots that the system should be turned on.

The final rule follows more than a decade of research by the FAA, NASA and others initiated by the fatal crash of an American Eagle ATR 72 near Roselawn, Indiana, in 1994 due to ice build-up on the wings.

Under the new rule new aircraft and those undergoing “significant changes” that impact icing safety must either have an ice detection system that automatically activates or alerts pilots to turn on the system; a definition of visual signs that indicate ice build-up along with an advisory system; or a method of identifying temperature and moisture conditions conducive to airframe icing, alerting pilots of the need to turn on the protection system.

Regardless of the activation method, ice protection systems must then operate continuously, automatically turn on or turn off, or alert the pilots that the system must be cycled again after the initial activation.

“We’re adding another level of safety to prevent situations where pilots are either completely unaware of ice accumulation or don’t think it’s significant enough to warrant turning on their ice protection equipment,” said FAA Administrator Randy Babbitt.

The FAA has previously addressed activation of pneumatic deicing boots on many aircraft models by requiring activation of boots at the first sign of ice accumulation. This new certification standard further increases safety by not relying on the pilot alone to observe whether the airplane is accumulating ice. Also this certification standard applies to all types of ice protection systems, not just pneumatic deicing boots.

The full text of the final rule is available at: http://edocket.access.gpo.gov/2009/E9-18483.htm

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