^Barreira, Victor (May 4, 2018). "Portuguese M-class frigates prepare for mid-life upgrade". Jane's Information Group. Work on first-of-class NRP Bartolomeu Dias (F333) will be carried out at the Royal Netherlands Navy's (RNLN's) shipyard from May and is expected to conclude in late 2019, the Portuguese Navy told Jane's . Work on sister ship NRP D Francisco de Almeidais (F334) will begin shortly after and is expected to complete in December 2021. On march 23 2021 the b. dias suffered a major surface accident leaving the port in Netherlands. No injuries no systems affected but will require additional repairs once they arrive at Lisbon naval base.