FAA proposes $200,000 civil penalty against Detroit's Wayne County Airport Authority (WCAA) for failing to maintain safe airfield conditions during November 2014 storm. This relates to allegations of failing to follow FAA-mandated Snow and Ice Control Plan (SICP). Allegedly, various DTW airfield surfaces became unsafe and WCAA failed to limit air carrier operations to portions of airfield where they could safely occur. WCAA has 30 days from receipt of FAA's enforcement letter to respond.