FAA NEW RULE ON ICING
 

FAA issues final rule on icing certification

Kylie Bull, London - IHS Jane's Airport Review
12 November 2014

Icing certification standards in the United States now have a broader scope, after the Federal Aviation Administration (FAA) issued a final rule on 3 November 2014.

The rule was originally proposed in June 2010.

The updated standards require US manufacturers to prove that aircraft can operate safely in freezing drizzle or freezing rain - these conditions lead to the icing environment known as 'supercooled large drops' (SLD).

The new standard also includes ice crystal weather conditions. Pilots usually encounter ice crystals, which can clog external air data sensors or lead to ice build-up in an engine, while they are flying around thunderstorms.

How MUCH icing?

It is highly variable....................

FAA NEW RULE ON ICING
 

Flying in freezing rain is impossible unless it is just a light and short freezing drizzle

Existing designs are grandfathered?

Anybody watched season 6 of Ice Pilots NWT?

Here is a link to the related AC:

http://www.airweb.faa.gov/Regulatory...C%2025-25A.pdf

I've only taken a quick glance (it's 72 pages :uhoh:) but the "supercooled large droplet" (SLD) freezing rain only appears to apply to 60,000 lbs or less MTOW.

In freezing rain or drizzle its best to be someplace else or better yet on the ground! This all comes down to those two brain dead pilots of Colgan Air Flight 3407!