According to the GI275 IM you don’t need an ATT gyro as back-up a Turn Coördinator is also fine (incombination with Altitude , Airspeed and stab.HDG)
I did first one, simple application but nice.
Interesting! Can you comment on it, and indicate what was connected to it and how?
One Q: let’s say you display the engine management page. If you turn it off and back on again a few days later, does it start up on that page again?
I have the following text and pics from a US pilot who installed the GI275:
A US pilot I know has installed the GI275 in a TB20. It is fed from an
IFD540 via both RS232 (for MapMX) and ARINC429 (for H and V
nav data). He also has a Sandel SN3500 though this wasn’t connected.
It was a bit of a process, with main issues arising from a limited
installer familiarity with the product.
In VOR mode it is necessary to manually enter the radial. This takes
about 3 steps in options. The installer confirmed they spoke to Garmin
about this and it is normal behavior.
Dimming the display was the next challenge. The shop had wired it to
the panel backlight bus, which on the TB is a crude variable voltage
arrangement and I had issues with it too with the SN3500. As a
workaround, they took it off the panel backlight bus and it now dims
according to the photocell on the instrument (with the ability to fine
tune it more on the instrument itself) which is much better anyway
since it removes the single point of failure: a failure of the main
backlight bus which would result in a mostly dark panel. I also wired
the RHS SN3500 in this way. However it later transpired that the
backlight bus was not dimming either so the circuit was faulty.
He did find a bit of a shortcut to put a VOR radial into the 275. When
flying with VORs, as you pass a VOR and start heading to the next VOR,
you can just hit “direct CRS” and it will enter the radial direct to
the next. You still have to go into options, then Nav Settings, but
its not necessary to keep cranking the knob to get to the correct
radial.
The 275 is not fed with the RS232 for fuel totalizer. The setup needs:
(1) ARINC 429 – for course and deviation
(2) ARINC 429 – VOR/ILS
(3) RS232 – MapMX for mapping
In my case, I did not have an available RS232 port on my top IFD so I
elected to go without it thinking I would use just the VOR/ILS CDI only to
save expense. It really wasn’t delivered with an invalid configuration and
the missing interface was my decision.
After flying it a bit, I saw the nice display and realized I should have
made the RS232 connection so that I could have CDI in GPS mode also (with
autoslewing). There would be no need to set course in GPS mode as I do
have to set radials in VOR mode.
I decided to move my Shadin fuel/Aviation data on an RS232 port from my top
IFD to my bottom IFD. This freed up an RS 232 slot on my top IFD so that
we could then connect the MapMX from the 275. I wish I had done this at
the original time of installation as the panel had to be taken apart again
and caused another 7 hours of labor.
As for the instrument lighting, it was wired to my panel rheostat which was
not working but moving it to the photocell was just a setting change on a
275 config page. I am still wired to my rheostat and could switch back to
that by making the change again on the 275 config page (although I won’t)
Lastly, there were no issues with an Avidyne STC that I am aware of. The
Garmin STC did say it required a Garmin GPS source and even though they
IFDs are plug and play with the GNS navigators, I did have to put in a
panel mount Garmin GPS antenna to meet that requirement. It was no big
deal. About a $200 part.
The attached pictures show the process to change radial in VOR mode. The
first one shows that my Sandel is showing 309 to the next VOR but the 275
is still showing 116 which was my inbound course prior to station passage.
All that was needed was to enter the options page, select the Nav button
and then touch “Direct CRS” to select the new radial direct to the next
VOR. The 2nd photo shows that the 25 is now indicating 311 to the next
radial.
Peter – GI275 starts always with 1’st page but you can configure with one is first.
Here I had simple connection at Cessna 140 so only power and Pitot/static but this unit have plenty of options.
You can even drive external relays due to airspeed’s (so for example airbone switch, flaps limiter etc).
Regarding this VOR selection. I don’t belive that it’s normal. This problem was also on G5 when was wrong configured or connected. I don’t think so they want to press someone to do such of crazy thinks..
How about CDI screen? OBS should behave like in analog CDI gauge..
We briefly touched on these units last tuesday, today i ran into these 2 videos with the GI-275 in action during approaches:
I just bought the GI 275 EIS with basically all sensor options with the $1k rebate promotion from Garmin in July.
Arrived only to find that the EASA STC hasn’t come through yet…
Anyone know when the EASA STC for the 275 will arrive?
I’ve been contacted by a friend in a far corner of the world, with no Garmin dealers and no avionics installers, who wants to buy 2 x GI275. One to replace a KI256 as an AI (for a KFC225 system) and the other to create an EHSI. Is anyone able to source these?
no problem – https://www.airteam.eu/p/garmin-gi-275-2
