Where can I find the legal paperwork or information on how to use metal spar wings on a wood spar Cub? Since there are different TCDS's for all cubs, then there must be an approval to install metal spar wings on a pre war Cub. (and vice versa) Service bulletins ? Field approvals? STC's ?
etc? I know they all fit but need the information on the approved method of using them.
etc? I know they all fit but need the information on the approved method of using them.
