필요할 때

when needed

→ 필요하다
phrase Rare #26,532
when needed A time expression formed from 필요하다 (to be needed) and -(으)ㄹ 때 (when). Depending on context, it can mean “when you need it” or “when necessary.”
KO: 필요할 때 언제든지 연락하세요.
EN: Contact me anytime when you need me.

각하 필요할 때 병력 보내주세요

Your Excellency, please send troops only when necessary.

— 천공의 성 라퓨타 (1986)