Have managed to find time to have a look at the Planning Application and see that it includes the runway extension and a blast screen.
The subject of airport boundary previously mentioned in posts # 2606 & 2607. appears to have been clarified. The Location Plan contained in the Planning Application indicates the airport site, not just that currently enclosed by the current boundary fence.
The blast screen is outside the current boundary fence and additionally the proposed extension, shown on the “Pavement Layout Plan", is so close that the fence will have to be moved.
Returning to the blast screen, a separate drawing of it indicates a possible clue as to the intended 02 TORA and therein the RESA. Shown on the plan is a “TAKE-OFF CLIMB SURFACE (TOCS) 2% SLOPE”. This is a runway protection surface which should be obstacle free in order to protect a departing aircraft.
The blast screen shown on the drawing extends above the TOCS. If this happens it could affect 02 take-off performance weights, and partially negate what could be achieved will all the extended TORA available.
The origin of the 2% TOCS slope is the runway strip end, or clearway (if provided beyond the strip end). Due to the limited distances I am discounting any clearway. The approximate distance to the origin is 113 metres from the point that the TOCS intersects the blast screen. Adding the runway strip end (60 metres) to this is the end of TORA.
Using Google Earth the expected location of the blast screen (shown on the “Block Plan” along the runway centreline to the current runway end is approximately 224 metres. Subtracting 173 metres from this (113 + 60) the end of TORA is 51 metres beyond the current runway end, giving a new 02 TORA of 1774 metres.
Due to the indicated alignment of the blast fence, to achieve a 2 x runway width RESA the length will be approximately 124 metres, better than the 90 metre minimum, but short of the recommended length.
I stress that all my calculations are approximate with an assumption that the ground level at the start of the 2% slope is the same, or close to, that at the blast screen.
It is hoped that AGS have done all their homework and that TORA and RESA lengths are already a done deal with CAA.
Last edited by TCAS FAN; 6th Oct 2020 at 15:17.