The FAA proposes to adopt a new airworthiness directive AD for certain THOMMEN AIRCRAFT EQUIPMENT AG THOMMEN AC32 Digital Air Data Computers. This proposed AD results from occurrences of AC32 Digital Air Data Computers ADCs that stop functioning below certain temperatures. This proposed AD would require replacing an affected AC32 Digital ADC with a serviceable part. The FAA is proposing this AD to address the unsafe condition on these products.