The phrase "as a necessary function" is correct and usable in written English.
It can be used to describe something that is essential or required for a particular process or system to operate effectively.
Example: "The software must perform data validation as a necessary function to ensure accuracy before processing."
Alternatives: "as an essential role" or "as a vital component".
The Greeks thought of tragedy as a necessary function in the enactment of cultural events".
His antics are often indulged as a necessary function of his all-consuming drive to make independent films succeed in a market that favors blockbusters.
As a necessary function of a product launch, startups are myopic — they're frenzied, they're broke and they're not remotely cognizant of the serious public policy hurdles to which they're racing.
This study adds preliminary support to the act of helping, as opposed to the receiving of help, as a necessary function of recovery support relationships [ 38].
Thus, Cdc45 and Mcm2 are required for DNA replication to occur, but (as discussed below) may provide a necessary function at some distance from the sites where DNA replication is actually occurring.
One reason for the maintenance of a motif through evolution is that it provides a necessary function, such as protein-protein interactions.
Some tubes have mercury in them, as a necessary part of their function.
Most people view speech as a necessary bodily function.
I view being able to make music as a necessary bodily function.
And insomuch as that a large contingent of our fellow humans live under governments possessed of no transparency whatsoever and operating largely in secret - and insomuch as that our own government has failed to earn any sort of easygoing trust on the part of its citizenry - such an entity as this serves a wholly necessary function.
We now know that an integral membrane protein is engaged in DHA retention in photoreceptors/retinal pigment epithelial cells as a necessary event for the function of these cells (Rice et al. 2015).
