On the BAe 146 fleet has been reported some flight control troubles after re-hydratetion of fluid type 2 and 4.
Our new procedures now are to use fluid type 1 when it's possible (in our network only VRN FRA and MUC have it).
If the type 2 and 4 are used the crew have to inform the MX in order to arrange a "de-icing check"within 1 day from the application on the fluid.