The A320 family aircraft are fitted with three SEC. Two of them (SEC 1 and SEC 2) endure the redundancy to control the elevators, in case both ELAC fail.
With the introduction of SEC C, a new hardware standard, analysis of maintenance reports has shown occurrences of inhibition of the capacity of control of the elevators by the SEC.
Nevertheless, on the F/CTL System page, the SEC boxes remain green, and no ECAM warning is triggered.
A systematic reset of both SEC 1 and SEC 2 one after the other, after both engine start, will ensure the full functionality of the SEC.
Source : OEB50 issue 1