§25.1324 Flight instrument external

probes (See AMC 25.1324) Each flight instrument external probes systems, including, but not necessarily limited to, pitot tubes, pitot-static tubes, static probes, angle of attack sensors, side slip vanes, and temperature probes, must be heated or have an equivalent means of preventing malfunction in the heavy rain conditions defined in Table 1 of this paragraph, in the icing conditions as defined in Appendices C and P, and the following icing conditions specified in Appendix O: (a) For aeroplanes certificated in accordance with CS 25.1420(a)(1), the icing conditions that the aeroplane is certified to safely exit following detection; (b) For aeroplanes certificated in accordance with CS 25.1420(a)(2), the icing conditions that the aeroplane is certified to safely operate in and the icing conditions that the aeroplane is certified to safely exit following detection; (c) For aeroplanes certificated in accordance with CS 25.1420(a)(3), all icing conditions. Table 1 – Rain test conditions Liquid Water Altitude Range Content (ft) (m) (g/m3) 0 to 10 000 0 to 3 000 6 Horizontal Extent Droplet MVD (km) (NM) (μm) 100 50 5 3 500 to 2 000 1 0.5