In 2007, the United Arab Emirates announced it had signed a memorandum of understanding with Airbus to purchase three A330 MRTT. A contract was signed with the UAE in February 2008. The first UAE A330 MRTT was delivered on 6 February 2013. The remaining two were delivered by 6 August 2013. The UAE tankers are equipped with both an ARBS and two Cobham 905E under-wing refuelling pods; these ARBS units include a secondary boom hoist developed for the UAE. This system permits the boom to be retracted, even in the event of a primary boom retraction system failure. The UAE tankers are fitted with Rolls-Royce Trent 700 engines. Saudi Arabia finalised an agreement to purchase three A330 MRTT equipped with both an Aerial Refuelling Boom System (ARBS) and two Cobham 905E under-wing refuelling pods, on 3 January 2008. In July 2009 it was announced that Saudi Arabia ordered three additional A330 MRTT tankers. RSAF chose the General Electric CF6-80 to power its A330 MRTTs. On 25 February 2013, the first A330 MRTT entered operational use. Three more A330 MRTTs have been ordered in a follow-on contract, delivery was expected in late 2014. By 31 August 2013, three had been delivered. In February 2012, Singapore expressed interest in the A330 MRTT to replace its four KC-135s. In February 2014, the Republic of Singapore Air Force (RSAF) selected the A330 MRTT over the Boeing KC-46, and signed for six aircraft. They are fitted with Trent 772B engines and configured for a maximum capacity of 266 passengers or of cargo, as well as a maximum fuel weight of . The first A330 MRTT arrived in Singapore on 14 August 2018 in a special livery. It made its first public appearance at the RSAF's 50th anniversary parade on 1 September 2018. On 30 June 2015, South Korea selected the A330 MRTT; the Republic of Korea Air Force (ROKAF) planned to induct four tankers by 2020. The first A330 MRTT was delivered on 12 November 2018, after a ferry flight from Airbus' final assembly line in Getafe, Spain to South Korea, piloted by a joint Airbus and ROKAF crew. Designated "KC-330 Cygnus", it extends the endurance of ROKAF aircraft over remote areas such as Dokdo, Ieodo, and the North Pyongyang-Wonsan Line, as well as increase its ability to deploy overseas for international operations.