roljoe,
Thank you for the correction to my statement above !
The de-icing procedures are not part of the FAA approved Flight Manual. However, Learjet states on the title page of the addendum;
"This addendum contains procedures for safe operation during icing conditions and for de-icing/anti-icing Learjet airplanes on the ground before flight."
The position of flaps for taxi to the de-ice bay may well vary depending upon condition of the taxi ways and the operators procedures. But the addendum makes it very clear that if the flaps require de-icing they must be extended to the FULL position for the de-ice procedure and then selected to the take-off position when de-icing is complete.
That's good enough for me.
best regards,
Bruce Waddington