Appendix 1 Table 2. Guidelines for Holdover Times Anticipated by SAL Type I and ISO Type I Fluid Mixtures as a Function of Weather Conditions and OAT.
CAUTION! THIS TABLE IS FOR USE IN DEPARTURE PLANNING ONLY AND IT
SHOULD BE USED IN CONJUNCTION WITH PRETAKEOFF CHECK PROCEDURES.
Freezing Point of Type I fluid mixture used must ba at least 10°C (18°F) balow OAT.
OAT Approximate Holdover Times Anticipated Under Various Weather Conditions (hours:minutes) °C OF FROST FREEZING SNOW FREEZING RAIN ON COLD
FOG RAIN SOAKED WING
• 32 0:18-0:45 0:12-0:300:06-0:15 0:02-0:05 0:06-0:15 & above & above below below CAUTIONI 0:18-0:45 0:06-0:15 0:06-0:15 0:01-0:03 Clear ice 32 may require to to touch for -7 19 confirmation below below 0:12-0:30 0:06-0:15 0:06-0:15 -7 19 THIS TABLE DOES NOT APPLY TO OTHER THAN SAE OR ISO TYPE I FPD FLUIDS.
THE RESPONSIBILITY FOR THE APPLICATION OF THESE DATA REMAINS WITH THE USER.
Appendix 1 Table 3. Guidelines for Application of SAE and ISO Type Il Fluids as a Function of OAT Minimum Concentration, Heated - Fluid/Water Ratio OAT (% by Volume) One-Step De/Anti-Icing Two-Step Procedure Procedure with SAE °C oF OR ISO Type II Fluid First Step Deicing Second Step Anti-Icing** above above 50/50 heated Type Il Water heated to 50/50 Type Il -3 27 60°C (140°F) minimum at the nozzle or a heated mix of Type I or Il and water -3 27 50/50 heated Type Il or to to heated suitable mix of -7 19 Type I with freeze point -7 19 75/25 heated Type lI not more than 75/25 Type I| 3°C (5°F) above OAT TO to
- 14 7 -14 100/0 Type Il fluid not 100/0 Type Il to to suitable for deicing.
•17 1 Consider use of
- 17 1 suitable mix of Type I 75/25 heated Type Il or or the two-step heated suitable mix of to to procedure Type I with freeze point not more than -25 - 13 3°C (5°F) above OAT below below TYPE Il used for anti-icing below -25°C (-13°F) must meet -25 - 13 aerodynamic acceptance test of AMS 1428, and maintain a buffer of at least 7°C (13°F). Consider use of SAE or ISO Type I where Type Il cannot be used.
Heated fluid - Fluid temperature not less than 60°C (140°F) at the nozzle Note: FOR OVERNIGHT PROTECTION USE TWO-STEP PROCEDURE, SECOND STEP ANTI-ICING ** To be applied before first step fluid freezes, typically within 3 minutes.
Caution: Aircraft skin temperature and OAT may differ 4
Appendix 1 Table 4. Guidelines for Application of SAE and ISO Type I Fluids as a Function of OAT OAT Minimum Concentrations, Heated - Fluid/Water Ratio (% by Volume) One-Step Two-Step Procedure °C OF De/Anti-Icing Procedure with Type I Fluid First Step Deicing Second Step Anti-lcing" above above Freeze point of Water heated to Freeze point -3 27 heated Type I 60°C (140°F) of heated fluid mixture minimum at the Type I fluid should be at nozzle, or a mixture.
least heated mix of should be at 10°C (18°F) Type I fluid and least below OAT*** water 10°C (18°F) below OAT below below Freeze point of -3 27 heated Type I fluid mixture should not be more than 3°C (5°F) above OAT Heated fluid - Fluid temperature not less than 60°C (140°F) at the nozzle Note: FOR OVERNIGHT PROTECTION USE TWO-STEP PROCEDURE, SECOND STEP ANTI-ICING ** To be applied before first step fluid freezes, typically within 3 minutes.
*** Clean aircraft may be anti-iced with cold fluid Caution: Aircraft skin temperature and OAT may differ 5