Transport Canada CF-2020-26

Requires a one-time inspection of each of the four multifunction spoilers (MFS) power control units (PCU); those with affected serial numbers will require replacement. Prompted by the inboard MFS surfaces failing to deploy during a production flight test that resulted in the degradation of the proportional lift dumping function. Detailed inspection of the MFS PCU showed that the piston seal was not in accordance with the production configuration.