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Date: Fri, 05 Aug 2011 10:37:36 -0400
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: Re-doing my panel - carefully thinking through failures
In-Reply-To: <listdigest-5082654@logan.com>
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I also concur with Brent, but I arrived at perhaps a diametrically opposite=
 conclusion from Fred's. =A0I also have dual Chelton screens, but only have=
 one battery and one alternator. =A0The backup is a vacuum-powered 6-pack i=
n a standard configuration on the right side. =A0True, it isn't in the "nor=
mal scan" as Brent would suggest, but it is close enough to fly by it. =A0T=
here are no "manual work-arounds" as Fred has. =A0The idea is that the weak=
 link in the chain (the pilot) will probably turn to mush in an emergency, =
so let's reduce his workload, not ask him to do more. =A0If there is an ele=
ctrical failure, the idea is to get on the ground, if necessary with the ha=
ndheld radio, and fix it there. =A0Just my thoughts.=0AGary=0A=0APreviously=
 from Fred:=0ABrent=A0has written much on this topic including "In my "Glaz=
ed and Confused" presentation on "Glass Cockpits" I say that flying an airc=
raft with a non-certified, non TSO'ed glass standby (Dynon et al) is like j=
umping out of an airplane with only your main parachute and your standby pl=
an is the fact you are wearing real soft socks."=0A=A0=0AI concur.=A0=0A=A0=
=0AWhen I was young and stupid (not long ago) I had thoughts of long overwa=
ter (think trans-Pacific) flights.=A0 I also have experience with failure m=
odes assessment analysis (FMEA) which frequently shows up failure modes eas=
ily over looked.=A0 After reviewing various electrical and instrument confi=
gurations I arrived at a system design which is shown in simplified form in=
 the attached sketch.=A0 It consists of two alternators, two batteries, fou=
r busses, and a lot of opportunities for cross tie.=A0 I use dual Chelton s=
creens, with PFD off the essential buss (many sources of power), the MFD of=
f of the avionics bus (which has many sources of power), and back up electr=
ic attitude=A0 indicator (on essential buss), turn and bank (essential buss=
) and air speed and altitude indicators.=0A=A0=0AYou show me the failure an=
d I can show you the automated or manual work around.
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div><span><span cl=
ass=3D"Apple-style-span" style=3D"font-family: Arial; "><div>I also concur =
with Brent, but I arrived at perhaps a diametrically opposite conclusion fr=
om Fred's. &nbsp;I also have dual Chelton screens, but only have one batter=
y and one alternator. &nbsp;The backup is a vacuum-powered 6-pack in a stan=
dard configuration on the right side. &nbsp;True, it isn't in the "normal s=
can" as Brent would suggest, but it is close enough to fly by it. &nbsp;The=
re are no "manual work-arounds" as Fred has. &nbsp;The idea is that the wea=
k link in the chain (the pilot) will probably turn to mush in an emergency,=
 so let's reduce his workload, not ask him to do more. &nbsp;If there is an=
 electrical failure, the idea is to get on the ground, if necessary with th=
e handheld radio, and fix it there. &nbsp;Just my
 thoughts.</div><div>Gary</div><div><br></div><div>Previously from Fred:</d=
iv><div>Brent&nbsp;has written much on this topic including "In my "Glazed =
and Confused" presentation on "Glass Cockpits" I say that flying an aircraf=
t with a non-certified, non TSO'ed glass standby (Dynon et al) is like jump=
ing out of an airplane with only your main parachute and your standby plan =
is the fact you are wearing real soft socks."</div><div>&nbsp;</div><div>I =
concur.&nbsp;</div><div>&nbsp;</div><div>When I was young and stupid (not l=
ong ago) I had thoughts of long overwater (think trans-Pacific) flights.&nb=
sp; I also have experience with failure modes assessment analysis (FMEA) wh=
ich frequently shows up failure modes easily over looked.&nbsp; After revie=
wing various electrical and instrument configurations I arrived at a system=
 design which is shown in simplified form in the attached sketch.&nbsp; It =
consists of two alternators, two batteries, four busses, and a lot
 of opportunities for cross tie.&nbsp; I use dual Chelton screens, with PFD=
 off the essential buss (many sources of power), the MFD off of the avionic=
s bus (which has many sources of power), and back up electric attitude&nbsp=
; indicator (on essential buss), turn and bank (essential buss) and air spe=
ed and altitude indicators.</div><div>&nbsp;</div><div>You show me the fail=
ure and I can show you the automated or manual work around.</div></span></s=
pan></div><div><font class=3D"Apple-style-span" face=3D"'times new roman', =
'new york', times, serif"><font class=3D"Apple-style-span" face=3D"'bookman=
 old style', 'new york', times, serif"><br></font></font></div><div style=
=3D"font-size: 12pt; font-family: 'bookman old style', 'new york', times, s=
erif; "><div style=3D"font-size: 12pt; font-family: 'times new roman', 'new=
 york', times, serif; "><br></div></div></div></body></html>
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