Exercise $2($Lecture $3/7)$

$(3p)$ When is an $($Aircraft$)$ Type Certificate issued?

$(2p)$ Is it possible that an aircraft has a non$-$valid Certificate of Airworthiness while having a valid Type Certificate?

$(3$p$)$ Which documents comprise the Type Certificate?

$(2$p$)$ A small company is manufacturing Aircraft Parts for a Type Certificated Airplane. Does this company need a Design Organisation Approval $($DOA$)?$