I could use some help settling a disagreement about the definition of HAT.
So my company uses the word HAT to mean “height of the aircraft above TDZE…at any given distance…at any given time”
So as an example, on an approach if you’re 20 miles out at 6000’ … then your HAT = 6000’ (assuming TDZE=0). Then if you’re 10 NM out at 3000’ then your HAT = 3000’.
So based on my understanding of the AIM’s definition of HAT, the above example is an incorrect use of the word HAT. HAT is a charted number on a plate, and it’s fixed. For the individual approach being flown, HAT does NOT change as the aircraft altitude changes. It does not reflect the aircraft altitude above TDZE, any ANY given distance.
Am I wrong?