12 C.F.R. § 150.70
Must I obtain OCC approval or file a notice before I exercise fiduciary powers?
Except for fiduciary activities subject solely to subpart E, you should refer to 12 CFR 5.26 to determine if you must obtain OCC approval or file a notice with the OCC before you exercise fiduciary powers. A Federal savings association may not exercise fiduciary powers unless it obtains prior approval from the OCC to the extent required under 12 CFR 5.26.