The British engine manufacturer holds a strong presence in Singapore with its campus located at Seletar. In 2012, this was further grown after it opened a manufacturing, assembly, test, training and research facility at the site. It assembles and tests Trent engines there, while also using it as a base for its Asia-Pacific customer service center.

ST Engineering Aerospace is one of Singapore's most prominent repair companies and has gradually built up its presence at Seletar. In 2014 it opened a new narrowbody and general aviation facility, while two years later, it added another hangar for the refurbishment of private jets. In early 2018, it opened a VIP aircraft interiors refurbishment center.

The Asia division of Fokker started operating a two-bay hangar at Seletar in 1997. Its current capabilities include heavy maintenance on Fokker and ATR aircraft types along with a component repair shop. It employs 30 technicians and engineers and operates a hangar capable of accommodating three regional aircraft or 2 narrowbodies.

Eagle Services Asia, a joint venture between engine giant Pratt & Whitney and Singapore's SIA Engineering, specializes in the repair and overhaul of Adv70 and PW4000 engines as well as GE90 models. By the end of the year, it is expected to begin servicing Pratt GTF engines, the result of an $85 million investment.

Aircraft OEM Bombardier opened its first facility in the Asia-Pacific region in 2014 with a 32,000 square foot heavy maintenance facility along with 15,000-sq-ft of office space. Initially servicing business jets, it has since expanded into commercial support through a customer service center and parts depot.

GE Aviation holds a strong presence in Singapore, with the country contributing around 20% to its overall global footprint. Earlier this year, the engine giant also signed an MoU with SIA Engineering to establish a joint venture for manufacture components for its GE9X engine at Seletar that will power Boeing's 777X aircraft. The facility is set to open in late 2018.

The joint venture between AFI KLM E&M and Sabena Technics opened in early 2018. Focusing on ATR and Airbus A320 aircraft, the JV holds capabilities for avionics, mechanical, hydraulic and pneumatic components as well structural parts and cabin and safety equipment.