|
Air data but no baro alt |
Post Reply 
|
| Author | |
paulr 
Senior Member 
Joined: 24 Jan 2014 Status: Offline Points: 558 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: Air data but no baro altPosted: 14 Feb 2024 at 6:54pm |
|
I am probably missing something super simple.
My IFD440 is wired to an Aspen display through an Aspen ACU. I get the Aspen wind vector block, and I see OAT, IAS, and TAS on the IFD (including on config page 5). What I *don't* see is baro altitude. More specifically, I still get "manual sequence required" when I fly a missed like the ILS 18 KMDQ, and I don't see B ALT or D ALT data on config page 5. Any idea what the missing ingredient here is?
|
|
 |
|
|
eallevato
Groupie 
Joined: 04 Apr 2018 Location: Northridge, CA Status: Offline Points: 69 |
Post Options
Thanks(0)
Quote Reply
Posted: 15 Feb 2024 at 10:37am |
|
That is because it is not wired properly.
In order to get Baro altitude, the ARINC 429 data to the IFD must come from pins 26 and 27 on the EFD itself and not from the ACU. Gene
|
|
|
Gene
|
|
|
|
|
paulr
Senior Member
Joined: 24 Jan 2014 Status: Offline Points: 558 |
Post Options
Thanks(0)
Quote Reply
Posted: 15 Feb 2024 at 10:52am |
|
Ouch. Is the ACU stripping that 429 label or something? I didn't see this explicitly called out in the IFD install manual, just a note that the Aspen is an approved airdata source. I need something I can show my installer (who's not an Avidyne dealer, grrr) to get them to fix this properly.
|
|
|
|
|
eallevato
Groupie
Joined: 04 Apr 2018 Location: Northridge, CA Status: Offline Points: 69 |
Post Options
Thanks(0)
Quote Reply
Posted: 15 Feb 2024 at 11:28am |
|
Yes, the ACU strips the Labels out.
See Note 2 on Figure 9-28A on the install manual. Gene
|
|
|
Gene
|
|
|
|
|
paulr
Senior Member
Joined: 24 Jan 2014 Status: Offline Points: 558 |
Post Options
Thanks(0)
Quote Reply
Posted: 15 Feb 2024 at 1:06pm |
|
Thanks, Gene! That's exactly what I needed.
|
|
|
|
|
Post Reply
|
|
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options