Originally Posted by
Allan Lupton
Yes, on the Trident we only used water injection for take-off, 1st and 2nd segments so could use demineralised water, rather than water-methanol. One-Elevens could use water for Approach climb compliance so had to use methanol as anti-freeze to cope with the cold during cruise.
I don't remember any methanol on the 1-11. There was a mod. to heat the water tank so the water could be carried to destination. ISTR that without the heater the water had to be dumped after 1 hour to avoid freezing. The tank was at the front of the aft baggage hold so not exposed to extreme cold.