Citation Excel Operations - Auxiliary Power Unit

This video demonstrates the startup procedures and basic operation of an Auxiliary Power Unit (APU) on a Citation Excel.

[@crjsim]

Thank you so much for the detail explanation!

[@RVRCMOONPIE]

Does a crew member have to stay in the cockpit during the apu operation

[@citationpro]

Not necessarily the cockpit, but nearby. This is a somewhat ambiguous area. The APU is not approved for "unattended" operation, although this term is not clearly defined. It generally is taken to mean a crew member must be in or around the aircraft while the APU is running. They might be sitting in the cabin, loading bags in the baggage area, outside but only a few feet away to supervise fueling, etc. The main issue is that the APU has numerous safeguards to shut itself down in the event of a mechanical problem, but if it shuts down with all of the lights/avionics powered on, the main ship battery will only last for about ten minutes. If a crew member is not present to promptly shut down the avionics and lights after an APU failure, they'd be stranded with a dead APU and dead battery.

[@jeanribeiro8689]

Muito Obrigado pelas aulas !!!!!! sucesso para você

[@samirbusaada]

Does the APU works in the air also,if so what are the limitations.

[@citationpro]

Yes, it does. It can be running as high as 30,000 feet (FL300) but must be below 20,000 feet (FL200) for starting it.

[@samirbusaada]

@@citationproThank you.

[@robinraphaelriverapomales2184]

Thanks for the great videos. You also explain and simple to understand the systems; Excellent presentation... now I know what a professional is supposed to be Captain it will be possible that you can prepare some videos Citation 560XL will be very grateful Thank you very much in advance Robin Raphael Rivera-Pomales