Second step: De-icing/Anti-icing First step: De-icing (1) 0 °C (32 °F) Heated or a heated and above fluid/water mixture Heated fluid/water Heated fluid/water mixture with a freezing mixture with a freezing point of at least 10 °C point of at least 10 °C (18 °F) below OAT (18 °F) below OAT below Heated fluid/water 0 °C (32 °F) mixture with a freezing down to LOUT point at OAT or below To be applied before step fluid freezes. (1) NOTE 1: Temperature of water or fluid/water mixtures shall be at least 60 °C (140 °F) at the nozzle. Upper temperature limit shall not exceed fluid and aircraft manufacturer's recommendations. NOTE 2: This table is applicable for the use of Type I Holdover Time Guidelines. If holdover times are not required, a temperature of 60 °C (140 °F) at the nozzle is desirable. NOTE 3: To use Type I Holdover Time Guidelines, at least 1 litre/m2 (~2 Gals/100ft2) must be applied to the de-iced surfaces. CAUTION: Wing skin temperatures may be lower than OAT. If this condition is identified, a stronger mixture (more glycol) may need to be used to ensure a sufficient freezing point buffer. Table 2 - Guidelines for the application of Type II and Type IV fluid/water mixtures (minimum concentrations) as a function of OAT One-Step Procedure Two-Step Procedure OAT Second step: De-icing/Anti-icing First step: De-icing (1) 50/50 Heated water or a 0 °C (32 °F) Heated/unheated heated Type I, II or IV Type II or IV fluid/water and above fluid/water mixture mixture 50/50 50/50 below Heated Heated/unheated (3) 0 °C (32 °F) Type II or IV fluid/water Type II or IV fluid/water down to LOUT mixture mixture 75/25 below -3 °C (27 °F) to Heated/unheated °C (7 °F) Type II or IV fluid/water mixture
De-icing/Anti-icing First step: De-icing Second step: (1) 0 °C (32 °F) and above Heated fluid/water mixture with a freezing point of at least 10 °C (18 °F) below OAT Heated or a heated fluid/water mixture Heated fluid/water mixture with a freezing point of at least 10 °C (18 °F) below OAT below 0 °C (32 °F) down to LOUT Heated fluid/water mixture with a freezing point at OAT or below (1) To be applied before step fluid freezes. NOTE 1: Temperature of water or fluid/water mixtures shall be at least 60 °C (140 °F) at the nozzle. Upper temperature limit shall not exceed fluid and aircraft manufacturer's recommendations. NOTE 2: This table is applicable for the use of Type I Holdover Time Guidelines. If holdover times are not required, a temperature of 60 °C (140 °F) at the nozzle is desirable. NOTE 3: To use Type I Holdover Time Guidelines, at least 1 litre/m2 (~2 Gals/100ft2) must be applied to the de-iced surfaces. CAUTION: Wing skin temperatures may be lower than OAT. If this condition is identified, a stronger mixture (more glycol) may need to be used to ensure a sufficient freezing point buffer. Table 2 - Guidelines for the application of Type II and Type IV fluid/water mixtures (minimum concentrations) as a function of OAT OAT One-Step Procedure Two-Step Procedure De-icing/Anti-icing First step: De-icing Second step: (1) 0 °C (32 °F) and above Heated water or a heated Type I, II or IV fluid/water mixture 50/50 Heated/unheated Type II or IV fluid/water mixture below 0 °C (32 °F) down to LOUT 50/50 Heated (3) Type II or IV fluid/water mixture 50/50 Heated/unheated Type II or IV fluid/water mixture below -3 °C (27 °F) to °C (7 °F) 75/25 Heated/unheated Type II or IV fluid/water mixture
OM%20template%20for%20non-complex%20NCC%20operators_August%202016.docx