IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM - 550 as secondary attitude display

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550 as secondary attitude display

Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=1246
Printed Date: 07 May 2025 at 1:09pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: 550 as secondary attitude display

Posted By: Apache
Subject: 550 as secondary attitude display
Date Posted: 10 Mar 2017 at 7:33am

Has the 550 been approved as a secondary attitude display? Specifically, can it be used as the backup display for an Aspen Pro?

Replies:

Posted By: mfb
Date Posted: 10 Mar 2017 at 9:09am

The Aspen STC specifically requires a backup attitude indicator that runs off a different power source than the Aspen. That means a vacuum A/I or an electronic one that has a standby battery.

In most light aircraft installations the IFD550 runs off the same DC power source that the Aspen does. So it can't be an approved backup.

And, if that weren't enough, the IFD550 Flight Manual Supplement specifically says (Limitations - Page 11) that the 550 "may not be used for primary attitude information or standby attitude information." It may only be used as a secondary, non-required, attitude display.

So... Nice try, but no cigar. Sorry about that.

Mike