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Date: Wed, 10 Oct 2007 09:02:17 -0400
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Subject: TruTrak ADI
From: marknlisa@hometel.com
Reply-To: marknlisa@hometel.com
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=0AI think you are guys all making a mountain out of a molehill...=0A=0A"Mi=
sinterpretation" is possible with ANY kind of instrument, even the tried an=
d true gyroscopic attitude indicator. That's why we are all taught NOT to r=
ely on any one instrument in IMC to understand what the aircraft is doing.=
=0A=0AAssume you are flying straight and level and wish to climb. You set a=
n appropriate nose-up attitude on your attitude indicator, but forget to ma=
ke a power adjustment. As the speed bleeds off you continue to hold the nos=
e up, but the aircraft stops climbing. Now you have a nose-high attitude wh=
ich should result in a climb (that's what you expect anyway), but the altim=
eter and VSI don't corroborate, and may, in fact, even be showing a descent=
 Would you pull back farther -- and possibly cause a stall -- or simply lo=
ok at the airspeed indicator and engine instruments and realize you are fly=
ing too slow with too little power to climb?=0A=0AThe way I learned instrum=
ents the attitude indicator was NEVER the primary control instrument for pi=
tch -- it was airspeed.=0A=0AI submit knowing the actual attitude (pitch, y=
aw, roll) of the aircraft isn't as important as understanding the SITUATION=
 (attitude, airspeed, VSI, weather, etc.).=0A=0ALetting a situation go far =
enough that you don't know exactly what the aircraft is doing might ALWAYS =
result in disorientation and ham-handed, knee-jerk reactions. In the exampl=
e cited by others to condemn the TruTrak ADI -- nose high in a descent with=
 the ADI indicating nose low -- a good scan would instantly orient the pilo=
t.=0A=0AAdditionally, TruTrak has already considered the above situation an=
d accounted for it. Should the pilot allow the aircraft to slow enough such=
 that pitch indications might not match the actual attitude of the aircraft=
, the TruTrak ADI will has a programmable warning indicator that tells the =
pilot to check the airspeed.=0A=0AFor myself, I find the TruTrak ADI a fine=
 alternative to more expensive mechanical gyroscopic instruments.=0A=0AMark=
 Sletten
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<font face=3D"arial" size=3D"2"><P>I think you are guys all making a mounta=
in out of a molehill...<BR><BR>"Misinterpretation"&nbsp;is possible with AN=
Y kind of instrument, even the tried and true gyroscopic attitude indicator=
 That's why we are all taught NOT to rely on any one instrument in IMC to =
understand what the aircraft is doing.<BR><BR>Assume you are flying straigh=
t and level and wish to climb. You set an appropriate nose-up attitude on y=
our attitude indicator, but forget to make a power adjustment. As the speed=
 bleeds off you continue to hold the nose up, but the aircraft stops climbi=
ng. Now you have a nose-high attitude which should result in a climb (that'=
s what you expect anyway), but the altimeter and VSI don't corroborate, and=
 may, in fact, even be showing a descent. Would you pull back farther -- an=
d possibly cause a stall -- or simply look at the airspeed indicator and en=
gine instruments and realize you are flying too slow with too little power =
to climb?<BR><BR>The way I learned instruments the attitude indicator was N=
EVER the primary control instrument for pitch -- it was airspeed.<BR><BR>I =
submit knowing the actual attitude (pitch, yaw, roll) of the aircraft isn't=
 as important as understanding the&nbsp;SITUATION (attitude, airspeed, VSI,=
 weather, etc.).<BR><BR>Letting a situation go far enough that you don't kn=
ow exactly what the aircraft is doing might ALWAYS result in disorientation=
 and ham-handed, knee-jerk reactions. In the example cited by others to con=
demn the TruTrak ADI -- nose high in a descent with the ADI indicating nose=
 low -- a good scan would instantly orient the pilot.<BR><BR>Additionally, =
TruTrak has already considered the above situation and accounted for it. Sh=
ould the pilot allow the aircraft to slow enough such&nbsp;that pitch indic=
ations might not match the actual attitude&nbsp;of the aircraft, the TruTra=
k ADI will has a programmable warning indicator that tells the pilot to che=
ck the airspeed.<BR><BR>For myself, I find the TruTrak ADI a fine alternati=
ve to more expensive mechanical gyroscopic instruments.<BR><BR>Mark Sletten=
</P></font>
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