IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM

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IFD540 F500/TWAS

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=1792
Printed Date: 16 Apr 2025 at 1:22pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: IFD540 F500/TWAS

Posted By: 2thomas
Subject: IFD540 F500/TWAS
Date Posted: 30 Jun 2019 at 11:48am

can anybody tell me the difference between F500 and TWAS? When i bought my 540 i was told that TWAS is included. now i see that F500 is activated but not TWAS and they told me it is the same but couldn't explain the difference.

thanks

thomas

Replies:

Posted By: AviSteve
Date Posted: 08 Jul 2019 at 11:42am

The F500 option is related to the "Forward Looking Terrain Avoidance" (FLTA) function. In order to provide the synthetic vision functions (including the exocentric view on the Map page), the system is required to implement FLTA-like functions. So, that's the "F" in F500. The "500" is for the 500' AGL callout feature.

TAWS includes other features over and above F500 such as alerting for Premature Descent, Excessive Descent Rate, and Negative Climb Rate.

The IFD doesn't currently claim the TAWS TSO. Therefore, the TAWS option has not been offered and no IFDs have it enabled. The option shown on the system page is there to support that option once it becomes available.

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Steve Lindsley
Avidyne Engineering