Paul's view of the Olympus 593 being started.
Paul of gasturbineworld.co.uk view of the 593 engine start.
You can clearly hear the pneumatic starter engage over the sound of the running APU, followed by the most pleasing sound of the 593 spooling up. When the APU is shut down (Start hose goes slack), it's all 100% Olympus. Check out the pallets in the far background from the jet efflux of the engine.