Manila plans to upgrade the avionics of three Lockheed Martin C-130 transport aircraft.
The upgrade will involve converting the cockpit from analogue to digital, and integrating a glass cockpit that includes touch screen displays, says the country's air force in a statement.
Flight Fleets Analyzer shows that the Philippines operates five C-130s: one C-130B, two C-130Hs, and two C-130Ts. The average age of these aircraft is 40.2 years.
Manila did not specify which aircraft will be upgraded, but there is a significant spread in ages across the fleet.
The two C-130Ts are of early 1980s vintage, but spent most of their operational lives with the US Marine Corps before being transferred the Philippine air force in 2016.
The C-130Hs, meanwhile, date from the mid-1970s, and the C-130B was delivered in 1961.