How embarrassing .... My comment was directed to Jukzizy.

However, in your example, it appears you have, quite inadvertently no doubt, run the Hp line across to the climb limit scale rather than from the climb limit weight against Hd line.

I just spotted the error 1 minute before your post

Trap for old players!

correction to my chart

Once again your chart does not consider the TO climb limit - see notes at bottom of chart.
The TO weight shall "not exceed the lessor of A and B"

Your working shows weight "A", you have not shown weight "B".

Thank you..got it

Trap for old players!

There are two groups of players in any activity. Those who have made mistakes in the past (ie all of us) and those who are at risk of making mistakes in the future (ie all of us) ... à la tienne !

As a more general comment, everyone needs to be very attentive to ensuring that

(a) values interpolated (eg heights, distances, etc.) are done so with painstaking accuracy - especially for the exams. Particularly when we are dealing with sloping lines, small errors can be amplified at the next intercept and the final answer can be way off the mark. For a tick the box computer test, that can lead, very easily, to nil marks for the particular question.

(b) all lines carried forward are done so parallel to the background grid, again with painstaking accuracy and for the same reason. Use of a Douglas protractor (or similar) so that the protractor and chart grids can be aligned accurately is highly recommended. Same applies to completion of trim sheets and the like

(c) specifically, for takeoff and landing charts, ALWAYS check if there is a climb weight limit chart and, if such exists, make sure that both the distance limited and the climb limited weights are determined. Note that not all charts will have climb weight limits - these will exist only if the aircraft has a climb problem (usually presented for hot and high conditions). The climb limit chart may be incorporated into the distance calculations (as for the Echo P-chart) or shown as a separate chart. Obviously, in the former, the drafter simply overlays the two to save on page real estate.