Enhanced T56 Engine Could save Billions in C-130H Operating Costs - Defense Update:
Rolls-Royce upgrades engine on market since 1950s – Indianapolis Business Journal
T56 | Rolls-Royce
T56 | Rolls-Royce
Vector Aerospace signs Rolls-Royce T56 support contract with major European government - Skies Mag
T56 Engine Virtual Training on Behance
File:Allison T56 (1).jpg - Wikimedia Commons
C-130 News: Rolls-Royce delivers first T56 series 3.5 upgrade kits to US Air Force for C-130H fleet - 2016 - C-130 Hercules.net -- The internet's #1 C-130 resource