True. Also when one of them fails, you won’t loose navigation or even autipilot capability (in case of the S-TEC 55 at least) Don’t know how dependent the Avidyne AP on the displays.
The Avidyne autopilot has a its own firmware. It will work as long as the ADHRS does. A screen failure is not a problem, but if the ADHRS of the EXP5000 PFD fails the A/P will disconnect. With the R9 version there are TWO ADHRS, so the A/P will keep working (in this case called “DFC100”)
Don’t see how the G1000 is any worse. They are all called integrated but both PFDs and the MFD are separate units. And each can replace the others.
Yes, it’s probably the same (I just didn’t say it becasue i have little experience with it!)
The two R9 units can replace each other too.
JasonC wrote:
They are all called integrated but both PFDs and the MFD are separate units.
They are separate hardware units. But likely they run the same firmware (with different state). But if some input conditions cause the firmware to crash, it’s relatively likely that the same bug triggers in both screens, even though they display different pictures.
Dual glass panels are usually setup in a cross redundancy mode such that the PFD can show part or all of what’s on the MFD and vice versa. And in case of total failure of either screen, the other can bring up split critical functions of both PFD/MFD. There is usually redundant ADHRS that can also failsafe. When doing software updates, there is also usually an Ethernet or some other local network that synchronizes the updates across both screens.
USFlyer wrote:
And in case of total failure of either screen, the other can bring up split critical functions of both PFD/MFD.
This certainly helps against hardware problems, but not against software bugs. Conditions that cause the software of one screen to malfunction are very likely present at the other screen as well.
Software fails in glass panels? Never heard of one…can you detail one for us….
USFlyer wrote:
Software fails in glass panels? Never heard of one…can you detail one for us….
See this.
See what? An AHRS failure is not software, it’s hardware. Hence the need for dual AHRS.
