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What is an OLS?
What is an OLS?
1. The OLS are represented by a 3D model. They define the surfaces within which the airport and planes need to be aware of protrusions so that they can be avoided. The 3D model has been around (unmodified as far as we know) since at least 2001. This means that currently nothing has changed and that therefore obstacles are being successfully avoided - the trees are safe because aircraft are aware of them and take avoiding action - by tailoring passenger/luggage/fuel loads appropriately. However if large planes flying on maximum loads were to be used the trees would become a problem. The OLS penetrations for Marlhill follow:
Appendix 2 - Obstacles.pdf2.The OLS numbers in this document (left) refer to a tree canopy that penetrates the 3D surface and its coordinates. The distance of the penetration is given. Please note this is not the height of the tree - which would be greater. An obstacle marker may be an individual tree or part of a tree's canopy. There may be more than one tree contributing to the overall canopy location - which can make itemising which trees are at risk a little problematic. There are 219 trees in total that would need felling or height reduction to clear completely this OLS list.
image004.png3. Here are the canopy markers for the first phase of works revealed in early 2019. Trees under markers 13993, 13996 and 14002 (on the right/east) were approved for felling by the City Council on 23 June on health & safety grounds (not air-safety grounds). T124 (14002) was/is the most 'penetrative' tree in the whole Copse at 22.15 metres pen.)
4. The rest of the trees due to have their height reduced (either felling or crown-reduction) are referred to in this Woodland Management Plan (WMP) but not by precise location. For example, the tall pines south of the path are referred to on page 25 (7). This corresponds to sections 1 A, 1B and 1 C (the part where the felling has already started) below.
marlhill-woodland-management-plan-june-2020-for-consultation (1).pdfFirst phase - ROTATE Portrait.pdf5. This from the Forestry Commission felling application 2019. All of these 'first phase' sections (including section 1D which north of the path includes obstacles 10398,10411, 10412 and 10426) will be included in the 2020 WMP. It does not seem that there will now be any new formal planning applications. All of the OLS protrusions now seem to be under the remit of the WMP.
6. The FC list of trees to be felled 2019 - named by compartment. 25 trees itemised
FC itemised felling !a, 1b, 1c 2019.pdf7. Quotes from the WMP (our highlights):
"In August 2018, Southampton International Airport Ltd (SIAL) purchased Marlhill Copse, Swaythling, in order to undertake tree management work required under European Aviation legislation." p4
"Convert pine dominated southern & eastern edges to a natural shrub interface." p4
"Following an initial period of flight safety works........." p22
"Fell the mature pines and associated potentially unstable Mixed Broadleaf (MB) between the Driveway and southern boundary against the closely adjacent housing in the south and SCC field to the east.
"Pollard or crown-reduce, not fell, the mature broadleaved trees that invade the flight safety zone from Southampton Airport and leave monoliths where possible." p24
The author of the WMP is employed by Southampton airport
8. The obstacle trees overlaid on Marlhill Copse and Mansbridge Open Space.
9. This is the map the airport does not want you to see. The green is the Ancient Woodland component. All the dots there are trees that the WMP targets to have their OLS penetrations removed. They range from reduction of 7 metres up to 20 metres.
A320 weight affects on takeoff gradients.docxEffects of load on A320's take-off gradient. Basically the lighter the plane the quicker the climb. Therefore what is an obstacle to a slow climb is not to a quick climb.
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