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deskjockey · September 9th, 2004, 15:45

Actually, in the P-3 Orion you would start #2 off the APU, then start #3 and taxi, or start all 4. Shutting down the APU after starting 2 would leave you single generator.

In flight the APU is used only as backup. Some engineers would start it prior to landing so that they didn't have to do it on the ground. Just personal preference. With 4 engines you don't really need a backup generator all ready on line.

September 9th, 2004, 15:45	#16
deskjockey Junior Member Join Date: Jul 2004 Location: Southport Corridor Posts: 42	Re: APU on for takeoff? Actually, in the P-3 Orion you would start #2 off the APU, then start #3 and taxi, or start all 4. Shutting down the APU after starting 2 would leave you single generator. In flight the APU is used only as backup. Some engineers would start it prior to landing so that they didn't have to do it on the ground. Just personal preference. With 4 engines you don't really need a backup generator all ready on line.