Following a May 12, 2005 incident in which a Boeing 717 experienced unreliable airspeed indications during climbout in heavy rain and icing conditions, the NTSB is revisiting an issue regarding automatic activation of the air data sensor heating system.
The National Transportation Safety Board recommends that the Federal Aviation Administration:
Require, on all new airplanes certificated under 14 Code of Federal Regulations Part 25, that the air data sensor heating system automatically activate after engine start.(A-07-55)
Require modification of existing airplanes certificated under 14 Code of Federal Regulations Part 25 that currently require manual activation of the air data sensor heating system to incorporate, to the extent technically practical, the automatic activation of this system; for airplanes that cannot be modified, require that cockpit warnings provide an upgraded warning associated with the failure to activate the heating system. (A-07-56) (NTSB)