emb-145 avionics with APU start
02-21-2009, 07:52 PM
#11
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Joined APC: Jul 2006
Position: XJT CA
Posts: 528
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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Joined APC: Jun 2008
Position: Ford F-150 Lav Edtion w/ Optional 10 Ton Hitch, Left(Driver)
Posts: 22
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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Joined APC: Oct 2008
Posts: 302
Originally Posted by Bloodhound
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.
02-24-2009, 03:22 PM
#15
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Joined APC: Oct 2006
Position: B757/767
Posts: 13,088
Originally Posted by undflyboy06
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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Joined APC: Oct 2006
Position: B757/767
Posts: 13,088
Originally Posted by Da Magic
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, 04:23 PM
#17
Part Time
Joined APC: Mar 2006
Position: Chief Pilot PC-12NG
Posts: 629
Originally Posted by johnso29
My favorite was the Check A1P Performance message. There are guys that have gate returned for that in the past.
I laughed my butt off after reading that. It's scary to believe that actually happens.
02-24-2009, 05:01 PM
#18
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Joined APC: Oct 2006
Position: B757/767
Posts: 13,088
Originally Posted by undflyboy06
I laughed my butt off after reading that. It's scary to believe that actually happens.
I know. Scary and sad considering guys at ExpressJet tend to set the parking brake quite often, especially when operating in EWR.
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