This is the 13741st most frequent Russian word.
несущей
"Несущей" means "bearing" or "supporting" in English.
In this sentence, 'несущей' is used as an adjective in instrumental case to describe 'конструкции' as bearing the load.
Крыло, несущей конструкции самолета, выполнено из лёгкого алюминия.
The wing, a load-bearing structure of the airplane, is made of lightweight aluminum.
Here, 'несущей' is used as an adjective in genitive case to modify 'стене' indicating it supports weight.
Дом построен на несущей стене, прочность которой проверена.
The house is built on a load-bearing wall, whose strength has been tested.
In this context, 'несущей' functions descriptively in genitive case referring to the supporting function of the 'конструкции'.