Standby Attitude Indicator Replacement

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Tim H
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Re: Standby Attitude Indicator Replacement

Post by Tim H »

vontresc wrote: Fri Aug 05, 2022 9:08 pm Ugh... just ran into this little footnote on the AV-30 AML...

https://uavionix.com/downloads/AV-30-C/ ... Signed.pdf

Limitations:  
[1] Excluding aircraft with Maximum Operating Altitude greater than 25,000ft  
[2] Cannot function as standby attitude indicator on EFIS‐equipped aircraft  
[3] Excluding aircraft configured for more than 6 passenger seats or greater than 6,000lbs MTOW

So much for that...
The Limitations column is blank for the DA-40, so I don't think they apply. The limitations do apply to other models such as the Aerostar, Cirrus, etc..
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mhoran
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Re: Standby Attitude Indicator Replacement

Post by mhoran »

If the AV-30 could eliminate the need for the two year backup battery replacement (specs say it has a two hour internal battery), it would pay for itself quite quickly. Unfortunately I don't think this is possible given the way the AMM is written.
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Rich
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Re: Standby Attitude Indicator Replacement

Post by Rich »

mhoran wrote: Sat Aug 06, 2022 3:04 pm If the AV-30 could eliminate the need for the two year backup battery replacement (specs say it has a two hour internal battery), it would pay for itself quite quickly. Unfortunately I don't think this is possible given the way the AMM is written.
This would be similar to my Aspen install. It has its own battery so it's disconnected from the emergency switch. But the emergency power also feeds the floodlight. So I still have the emergency switch (and batteries). The switch is now labeled "emergency flood light power". For me this is not a big deal expense-wise. The likelihood of this ever being used is minuscule and I even have a backup to that, as my iPad is positioned such that its light can be used to illuminate the entire panel.

Incidentally, if one installs the RC Allen in a pre-G1000 DA40, it should include its own backup battery, as the open-circuit voltage (mine came out to 45 V at last change) of the 28 AA batteries is too high. I confirmed this with RC Allen. The G1000 high-expense battery should be OK.

But keep in mind that the solutions with built-in batteries generally have their own required replacement intervals. In the case of the RC Allen, e.g. it's 36 months.
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Charles
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Re: Standby Attitude Indicator Replacement

Post by Charles »

I also have an Aspen and RC Allen as backup. I did not bother to install a battery on the RC Allen given the Aspen has one. It would take a failure of the electrical system AND a failure of the Aspen to take both AIs out, which I feel is an acceptable risk to me.
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Steve
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Re: Standby Attitude Indicator Replacement

Post by Steve »

Rich wrote: Sat Aug 06, 2022 3:47 pmBut keep in mind that the solutions with built-in batteries generally have their own required replacement intervals. In the case of the RC Allen, e.g. it's 36 months.
Very true. I have a maintenance spreadsheet that lists all of the ADs, SBs, and replacement intervals. Here is the "Other" category section, which includes batteries:
DA40ADs.pdf
(25.6 KiB) Downloaded 10 times
A lot of stuff to remember...
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gyro3816
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Re: Standby Attitude Indicator Replacement

Post by gyro3816 »

There are ZERO limitations for the av-30c usage as a backup attitude indicator in all DA40s.
I think everyone on here should read the approved aircraft list. In the document note the column “limitations” for the da40 is blank (as there are none) so the previous comment regarding EFIS is inaccurate wrt da40.
The AV-30C is a solid choice at a solid price point.

https://uavionix.com/downloads/AV-30-C/ ... Signed.pdf
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Re: Standby Attitude Indicator Replacement

Post by jwx96 »

The standby electric AI used in the G1000 DA 40s is the primary AI in my 2003 DA40. The 1.5 hr AI backup battery in these early models is a pack of AA batteries. I am thinking of adding a Dynon D3 AI to back up the AI. It pinch mounts to a spare instrument hole so there is no approval required and it costs < $900. The unit goes home with you and has a rechargeable 8 HR battery. The reviews are good. It won’t work for a backup AI on G1000 planes.
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