GPS Data and IFR

[Auburntsts]

Originally Posted by Sqrfrk

I guess the last question I have then is the motivation for larger screen navigators, that is, what are practical use cases for pairing a large screen IFR navigator like the IFD550 or GTN750 with say a two screen EFIS? I know a few Cessnas in my club opted to have the GTN750 installed, but they had the standard instrument six pack.

It makes some tasks easier as everything is displayed in one place vs having to page around and it can free up screens to show other data, but that's primarily personal preference. For example, I have a 2 Screen non-touch G3X and a GTN 650. The moving map on the 650 is basically worthless. Enroute I display nearest airports on it, and on approach, the flight plan so I can make quick changes in routing if required. On my MFD enroute I typically display the moving map and the selected approach plate on approach. If I had a GTN 750, it would give me more options as to where and what I displayed at any given time.

I should note that I also have my tablet up with GarminPilot at the same time.

[terrykohler]

As already mentioned, the TSO'd box feeds information into the EFIS, which is really just a display (I know, it can be wired to a GPS antenna as well,). When using the EFIS as your primary flight display, you should be able to display localizer and glide slope information in some fashion (needles or scales). All the information you need is right in front of you, unlike in the "old" days when we have to scan the six pack and then the OBS/GS display head.

You don't "need" 2 EFIS screens to safely fly IFR - one will do. You'll still need some backup though - a Garmin G5 or an GRT Mini will work well.

As for the approach charts, you don't need to display them on an EFIS. If you do, the EFIS has to have a large enough screen for you to read them. Many of us use Ipads or something similar to display plates. If you use something like Foreflight, the annual subscription cost is less than $200. When flying an approach, you shouldn't be staring at a plate anyway - you should have the MDA/DH and missed approach procedure committed to memory. You should be focused on flying the plane.
Terry, CFI
RV9A N323TP

[BobTurner]

Absolutely strictly speaking, a TSO for, say, my Garmin 420W, also specifies one or more specific antennas, and one or more specific CDIs. However, the FAA is content to accept your or your manufacturer?s assessment that it meets ?the performance standards?. For an indicator, this is pretty simple: when the box commands ?fly left?, does the needle move left? etc. Same for required indicators. You can roll your own colored lights as long as they work. So, bottom line, FAA is happy with non-TSO indicators as long as they work. They are suppose to be within the designated field of view.