Summary
We propose to adopt a new airworthiness directive (AD) for Rosemount Aerospace Model 851AK pitot probes that were repaired by CSI Aerospace, Inc. that are installed on airplanes. This proposed AD was prompted by a report that certain pitot probes are indicating the wrong airspeed during flight in icing conditions. This proposed AD would require inspecting the airplane to determine the number of affected pitot probes installed and replacing the affected pitot probes. We are proposing this AD to correct the unsafe condition on these products.