RD,
Iīm so glad you take joy in other peoples missory, but your igonarance in this matter is obvious. On the 146, you donīt get fumes in the aircon for any other reason than that the APU is worn, any knowing YOUR fleet of 146īs it is astounding that you have never experienced Aircon smoke.
Brgds
Doc
P.S. Does your De-icing staff spray De-icing fluid into the APU bay ? and if so WHY ?????