Lanfranc,
Please point me to the "many, many references specifically prohibiting it" which you stated in your post.
I agree that the majority of opinions in this thread favor the side of being illegal, but keep in mind, that's what they are.... opinions.
If you wish to "find a single definition of Landing Distance Available that includes the area before the displaced threshold" as you stated, see my original post with the link to the Canadian AIP which CLEARLY states that it is available. Black and white.
For some reason, you are very upset. You need to relax a little and use some common sense. You ask if I think an unprepared surface is ok to land on too. Is this question really necessary, or are you a little on tilt?
You stated that aviation regulations are full of grey areas. This is one as well. To prosecute some one for something, it generally should be black and white, or common sense.
What is the common sense reason in this case? What in this SPECIFIC case is dangerous about touching down before the threshold. Are the wheels gonna bust through the pavement? Is it possible to hit an obstacle that is 2 miles behind you?
What are the inherent dangers of touching down past the threshold? Wet runway? Bad brakes? Beta Failure? Wind shear? Deep ocean of the end? Once again, several aircraft have run off the end after touching down past the threshold. None (zero) have ever run off after touching down before.
If you relax a little and read more of the relavent posts, you'll see that I was never generalizing that it is ok the land before a threshold at any random airport. I am talking about a specific case. And in this specific case, if you choose to land past the displaced threshold everytime, it will only be a matter of time before you run off the end.
But, we are talking about black and white so again Lanfranc, PLEASE POINT ME TO THE ""many, many references specifically prohibiting it"