emb-145 avionics with APU start
02-21-2009 | 07:52 PM
#11
Gets Weekends Off
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From: XJT CA
I'd like to know how and why when you start the APU, the displays turn a fraction to the right. As if some way, somehow, the physical motion of the turbine turning gets translated into an electrical signal that torques the screens.
02-22-2009 | 02:23 PM
#13
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From: Ford F-150 Lav Edtion w/ Optional 10 Ton Hitch, Left(Driver)
Yeah, I've seen that too! It must be tied into the SPS system too because it sometimes turns on as well.....in super sloooowwwww mooootion! I don't have any clue but a good plane though.
02-24-2009 | 02:25 PM
#14
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thats if you dont get the red X's on the displays followed by the dumbest eicas message ever CHECK PFD1-2......... "well no sh!t i see its out!"
02-24-2009 | 03:22 PM
#15
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From: B757/767
I thought it didn't matter if you started the APU with the avionics on because the APU is started by using power from Battery 2. During APU starting, battery 1 is isolated from the load buses. While battery 2 provides power for APU start, battery 1 is used to provide stable electircl power to the equipment that can be adversely affected by voltage transients.
So you can safely turn on the batteries, with the avionic switches engaged, let the APU due the self test, and fire it up.
So you can safely turn on the batteries, with the avionic switches engaged, let the APU due the self test, and fire it up.
That's correct. It's not necessary to turn the avionics masters OFF before starting the APU. Just crank it, the Electrical Logic protects the system.
02-24-2009 | 03:25 PM
#16
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From: B757/767
02-24-2009 | 04:23 PM
#17
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From: Chief Pilot PC-12NG
02-24-2009 | 05:01 PM
#18
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From: B757/767
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