Hi punkalouver,
I cannot see that as preventing use of typ. II & IV fluids. It only states that - of such types had been applied earlier, they will - after 4 hours (
) have watered down so much that they consitute more of a freezing threath than any kind of protection - and must therefore be removed like all other contaminants. You would only run into this problem if you - after being deiced/anti-iced had a delay for more than 4 hours...
However - I can read that paragraph as prohibiting the use of a one-step procedure. First you must remove the contaminants using type I - and than onto anti-icing with type II/IV. So you're right - you will need type I to comply with the wording in that paragraph.
Used to fly in Norway - on runways where the ATR did not like type II/IV (if you wanted to carry anything but yourselves and a few drops of fuel). Solution - board pax in hangar, then apply type I fluid. Since in the hangar - the HOT had not yet started. Then start 2 in H-mode (with prop-brake), push-out while starting 1, and then hurry off to the runway. Seem to remember we had 7 min. HOT from when the tail first stuck out of the hangar
Brgds
Empty