Hi there, I am using book revised for DEC 2-2021 version. After its publication have CASA removed the density height scale in their PPL, CPL, workbook for Landing and take off performance charts ? as in the book the explanation shows that if density height given we can directly plot it on the graph as our starting point.
If they have actually changed their charts does it means there will be any new method to start off them ? if density height given in the question ?
The images attached may be helpful
Many thanks in advance 🙂 [attachment=2295]IMG_7295.jpg[/attachment]
The scale is still there, it's just not printed.
If you enter with an appropriate Hp and OAT you will get the relevant Hd. So, given Hd, pick a value for Hp, work out the OAT and enter with Hp/OAT to get Hd. Just a minor nuisance.
Be aware that some of these charts are drawn pretty dreadfully and the Hd values are a bit all over the shop.
Engineering specialist in aircraft performance and weight control.
Thanks for your message john, actually i was talking about the ppl cpl workbook, which i printed recently from casa webpage and i forgot to attached its image but i have attached it again named as "IMG_7294.jpg" . Cant find any density values scale on the x axis of the graph.
The scale has been left off the chart. No big deal. It's really still there, just not printed.
You can either remember how it is drawn or plot a combination of pressure height and OAT to give you whatever density height you need.
Easy peasy.
Engineering specialist in aircraft performance and weight control.
The simplest way to enter at density height, if there is no density height scale given, is to enter at [u]pressure height[/u] and go to the [u]ISA temperature[/u] at that pressure height.
