March 2, 201412 yr Hi all, I am just wondering what systems activate when you first enable ground power from a cold 'n dark cockpit in PMDG's 737NGX? There seems to be a lot of noise in the cockpit with the engines, APU, packs/fans, pumps etc all turned off... Just curious is all. Is it really like this in the real 737? Would love to know. Thanks Lukas Wolfe
March 2, 201412 yr Everything really. Power goes though the tie bus then through the bus tie breakers then to both AC Transfer busses 1 and 2. At that point, power then energizes the main busses and galley busses associated with each AC transfer bus. The GPU also powers up the ground service bus which enables battery charging. FAA: ATP-ME, 737 CA, enough time in the 757/767 to be dangerous 🤠 Matt Kubanda, 7950X3D, 64GB RAM, RTX 5090@4k, MSFS 2024
March 3, 201412 yr Author Everything really. Power goes though the tie bus then through the bus tie breakers then to both AC Transfer busses 1 and 2. At that point, power then energizes the main busses and galley busses associated with each AC transfer bus. The GPU also powers up the ground service bus which enables battery charging. Thanks for the answer. It makes a lot of sense - thankfully we don't have to flick switches to energise all those buses manually! Would have been interesting with all these systems if the circuit breakers and subsequent failures were simulated... Lukas Wolfe
March 3, 201412 yr You can fail the busses I believe. Just not trip any circuit breakers. FAA: ATP-ME, 737 CA, enough time in the 757/767 to be dangerous 🤠 Matt Kubanda, 7950X3D, 64GB RAM, RTX 5090@4k, MSFS 2024
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