It's called the auxiliary power unit, and it's the smallest engine on the plane. But that doesn't mean it serves a small purpose. It provides the necessary power to start the plane's engines and ...

TPS has delivered more than 150 auxiliary power supplies (APS) for a variety of light rail platforms across the world. These products are successfully operating on trains in Beijing Airport, Kuala ...

TPS has delivered more than 450 auxiliary power supplies (APS) for monorail platforms worldwide, including a custom-designed APS for monorails in King Abdullah Financial District, Saudi Arabia, and ...

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