Tads (Type Approval Data Sheets)  

The approval of the design of certain types of aircraft, engines and propellers is signified by the issue of a Type Certificate.

The design standards for microlights and are listed on Type Approval Data Sheets (TADS)

Microlight TADS can be download from the CAA HERE or the BMAA HERE

TADS include information about each aircraft type, including weights, restrictions, mandatory upgrades and a list of approved optional modifications for that type of aircraft. (see MODS page)

HADS ( Homebuilt Aircraft Data Sheets)

HADS are Data sheets for homebuilt Aircraft. A link to HADS on the BMAA website can be found HERE, but is not relevant to flexwing aircraft, and therefore is only for reference here