The backbone of the transport fleet are the four KC-130B, one KC-130H and five C-130H Hercules transport aircraft, which are expected to remain in service through 2030, will be undergoing an extensive modernisation process to bring all ten existing airframes to the same common standard. The first airframe, a KC-130B, was returned to frontline service on 21 September 2010. ST Aerospace, the main contractor behind the project, is expected to upgrade the other nine airframes for the RSAF within the next seven years. Included in the package is the replacement of cockpit flight management system with a modern glass cockpit avionics suite, central engine displays to replace analogue gauges, improved voice communications, digital autopilot, flight director as well as a digital weather radar, which will make the aircraft Global Air Traffic Management-compliant. Also, the C-130Bs will receive an auxiliary power unit and environmental control system in common with the C-130Hs. Once the upgrade is completed, this will effectively give the RSAF five KC-130Hs and five C-130Hs.
