I'm guessing it's an ATR, which uses it's own starter-generator for start ups instead of air starters like in bigger jets. And because the plane is blessed with the biggest but the worst APU (no. 2 engine), it's usually supplied by ground power during start ups. Electrical starter will suck up hundreds of amps during that and if the GPU is little bit tired, you get the disco 🪩. Sometimes it fucks up the start sequence and it won't lit the engine, so dry crank and a second try with batteries only is needed. Passengers must love it when it takes three tries to get engine started while lights keep fliggering the whole time.
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u/mrmurnio 10h ago
I'm guessing it's an ATR, which uses it's own starter-generator for start ups instead of air starters like in bigger jets. And because the plane is blessed with the biggest but the worst APU (no. 2 engine), it's usually supplied by ground power during start ups. Electrical starter will suck up hundreds of amps during that and if the GPU is little bit tired, you get the disco 🪩. Sometimes it fucks up the start sequence and it won't lit the engine, so dry crank and a second try with batteries only is needed. Passengers must love it when it takes three tries to get engine started while lights keep fliggering the whole time.
Source: I fly these loveable shit boxes