[2] When Pope Benedict XVI erected the Roman Catholic Diocese of Maliana on 30 January 2010, he appointed Amaral as its first bishop.

[1] The consecration ceremony was held at the Sanctuary of John Paul II, in Tasitolu, Dili,[5] and the installation took place in Maliana.

[7] On 20 June 2017, Amaral blessed the new Kay Rala Xanana Gusmão International Airport in Suai during its official inauguration.

[10][11] On 26 March 2020, Amaral, along with Archbishop Virgílio do Carmo da Silva and Bishop Nascimento, signed a statement confirming a decision of the Timorese Episcopal Conference cancelling mass during Easter in the whole of East Timor, due to the COVID-19 pandemic.

"[14]In April 2023, ahead of that year's East Timorese parliamentary election on 21 May, Amaral called upon politicians to "take a role in maintaining peace and stability" rather than "attack each other or spread hatred in the presence of supporters.

"[15] At the end of February 2022, Amaral underwent intensive treatment at Guido Valadares National Hospital (HNGV) in Dili for hypertension.