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At what point is the APU started for 738 and 320nx?

Featured Replies

Is it typically started after all pax and cargo is loaded and doors closed, or when would the APU typically be started?

Thanks 

Noel

System:  9900X3D Noctua NH-D15 G2, MSI Pro 650-P WiFi, G.SKILL  64GB (2 x 32GB) 288-Pin PC RAM DDR5 6000, WD NVMe 2Tb x 1, Sabrent NVMe 2Tb x 1, RTX 4090 FE, Corsair RM1000W PSU, Win11 Home, LG Ultra Curved Gsync Ultimate 3440x1440, Phanteks Enthoo Pro Case, TCA Boeing Edition Yoke & TQ, Cessna Trim Wheel, RTSS Framerate Limiter w/ Front Edge Sync.

Aircraft used in MSFS 2024:  Fenix A320,  Aerosoft CRJ, FBW, WT 787X, I-Fly 737 MAX 8, Citation Longitude.

 

31 minutes ago, Noel said:

Is it typically started after all pax and cargo is loaded and doors closed, or when would the APU typically be started?

Thanks 

When you need it. What are outside conditions like? Is it summer and the ground air can’t keep the cabin cool? Those cabins can get mighty hot on the 737s when you board them up. Do you need heat in the winter time? I personally start the APU as close to departure time as I can to save fuel but if it’s remotely toasty in the back before we board, I’m firing up the APU. My passengers’ comfort comes first before fuel savings while at the gate.

FAA: ATP-ME, 737 CA, enough time in the 757/767 to be dangerous 🤠

Matt Kubanda, 7950X3D, 64GB RAM, RTX 5090@4k, MSFS 2024

 

 

 

  • Author

Matt, are there situations outside of need where you aren't to start the APU,, perhaps when stair boarding is done on a ramp or what have you, or no it's all based on need for power.  And if there is ground power available is that quite limited insofar as passenger comfort is concerned so the APU gets started even when there is ground power?

Thanks!

Noel

System:  9900X3D Noctua NH-D15 G2, MSI Pro 650-P WiFi, G.SKILL  64GB (2 x 32GB) 288-Pin PC RAM DDR5 6000, WD NVMe 2Tb x 1, Sabrent NVMe 2Tb x 1, RTX 4090 FE, Corsair RM1000W PSU, Win11 Home, LG Ultra Curved Gsync Ultimate 3440x1440, Phanteks Enthoo Pro Case, TCA Boeing Edition Yoke & TQ, Cessna Trim Wheel, RTSS Framerate Limiter w/ Front Edge Sync.

Aircraft used in MSFS 2024:  Fenix A320,  Aerosoft CRJ, FBW, WT 787X, I-Fly 737 MAX 8, Citation Longitude.

 

If in doubt, ask a real pilot:

 

Edited by 109Sqn

OS:     Win11 Home; Mobo: Asus TUF Gaming Z690-Plus WiFi D4; CPU: Intel i5-12400 (Alder Lake) 4.4 GHz
RAM: Corsair Vengeance DDR4 64Gb (4x16GB) 3600 MHz; GPU:  MSI Radeon RX 5700XT [8GB] 
SSD:  Corsair Force MP510 (for OS);  2x 1TB & 1x 2TB Sabrent Rocket Nvme PCIe 4.0 (one for sim, two for addons)
HDD:  Seagate 3TB (Data); Seagate 1TB (Programs), ASUS TUF Gaming VG32VQ1B Curved 31.5" monitor, 1440p, 38Mbs ethernet 

Fulcrum One Yoke, Honeycomb Bravo throttle, Thrustmaster Airbus TCA sidestick & throttle, Logitech Pro pedals, Xbox wireless gamepad (1st gen)

1 hour ago, Noel said:

Matt, are there situations outside of need where you aren't to start the APU,, perhaps when stair boarding is done on a ramp or what have you, or no it's all based on need for power.  And if there is ground power available is that quite limited insofar as passenger comfort is concerned so the APU gets started even when there is ground power?

Thanks!

To your second question, yes, GPU or not, if it’s u comfortable in the cabin, start the APU. I’ve seen cabin temps go above 40c and I rushed everyone off the jet. The PC air couldn’t cool the cabin. We didn’t have an APU then. It was MELed. it’s one of those things where it’s about being a pilot/captain, your priority are those passengers. Everything you do should be for the safety of said pax. Right? 
 

for the first question, there are airports and instances where having the APU on prohibited at certain gates or situations where having the APU on would make things really inhospitable. We prep for those as a crew and an airline. Then at that point, we start up the APU at the very last minute.

 

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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