Forgetting to recite the Takbeers

Q: Salaah-177: In the first Rakaah of the Eid salaah, the Imaam forgot to call out the extra Takbeers. What has to be done?

Answer: If he remembered before completing Surah Faatiha, he should call out the Takbeers and then repeat Surah Faatiha and the Surah. However, if he had already recite Surah Faatiha together with the Surah, he should call out the Takbeers without repeating the Qiraa'ah.

Fatawa Rahimiyyah vol.2