Under which condition is the Imam legally required (Wajib) to perform recitation aloud (Jahr)?

The Necessary Acts of Prayer Part 2: Sittings, Testimony, and Cong.

• In the third rak'ah of Maghrib.
• In Fajr, the first two rak'ahs of Maghrib and Isha, Friday, Eids, Tarawih, and Witr in Ramadan.
• In all daytime voluntary prayers.
• In Zuhr and Asr prayers.