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Re: InFO 09015: Benefits of AOA Instrument in
Lancairs
The FAA's recommendation for a AOA and impending stall warning is
prudent (in addition to their other suggestions). I have a
Chelton system that provides aural and visual stall warning based on
calculated airspeed, trajectory, and G loading (calculation), tied to
programmed stall speeds (derived from real stall experience).
There was a brief ListServ discussion several years ago about the
accuracy of the Chelton to depict and warn regarding impending stall
(again, based on calculation) and how this might compare to the AOA
indicator sampling real aerodynamic pressures. There were not
enough dual installations to provide any experiencial reports. I
have seen my Chelton accurately warn of impending stall in straight
flight (1G), correlated with actual stall, and have seen warnings
under G loading that have modified my bank angle and warned me to
unload the wings.
Does anyone have the Chelton system AND one of the AOA
insturments installed, and has operational experience comparing the
Chelton's depiction of impending stall with the AOA's sequential
indication of impending stall? Specifically in both straight
flight and under G loading?
Please share...
Jeff L
LIVP
This from Ted Stanley and the FAA.
I find it interesting that they finally recommend the installation of
an AOA instrument, something we've been preaching since the early days
of the Lancair Network News, right up through the present. Even
more ironic is the fact that Jim Frantz worked for years at getting
his simpler but very capable AOA Sport certified and the FAA managed
to throw roadblock after roadblock in his path, and, to the best of my
knowledge, he (or the new owner of that business) still hasn't managed
to get it certified. In the meantime the FAA is allowing
night-time aerobatic displays with fireworks coming out of the
wings..... aii-yii-yii....... go figure!
<M>
Marv - Not sure if you
get these but thought I should pass it on. - Ted
Stanley
----- Original Message -----
From: 9-AWA-AVS-AFS-SAFO-Info@faa.gov
To: undisclosed-recipients:
Sent: Friday, October 02, 2009
12:48 PM
Subject: InFO 09015 , Safety
Concerns of Lancair Amateur-Built Experimental Airplanes
InFO 09015, Safety Concerns of Lancair
Amateur-Built Experimental Airplanes, is for all air
operators.
To alert owners/operators and pilots about a Federal
Aviation Administration (FAA) operational safety concern regarding the
Lancair amateur-built airplanes operating under an experimental
airworthiness certificate.
An InFO contains valuable information for operators
that should help them meet certain administrative, regulatory, or
operational requirements with relatively low urgency or impact on
safety.
This InFO will be posted at the following FAA public
Web site soon:
http://www.faa.gov/other_visit/aviation_industry/airline_operators/airline_safety/InFO/
Attachment converted: Macintosh HD:InFO 09015 1.pdf (PDF /prvw)
(00602514)
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