IImorrow 2001 GPS IFR Cert

"MJC" wrote in :

wrote in message
...
In addition to the frequency tests mention, the GPS has to display on
an external CDI, there has to be a switch and annunicator to change
that external CDI from VOR/LOC to GPS, and some installations require
an
external
annunicator for Approach Mode.



I apologize if this changes the subject a little, but I'm
wondering
about something related to your comment.
I'm planning a panel for my Experimental (RV7), and it will have
the
Grand Rapids EFIS/AHRS display. For radios, there will be both the
GNS-430 GPS and the SL-30 Nav/Com.
The interesting part about the setup is that both radios can be
switched
to display and drive the HITS on the EFIS (if I understand the specs
correctly).
So, the question is: Is a HITS display driven by either a
certified GPS
or a certified NAV signal a "legal" equivilant for a separate CDI
instrument?

MJC



The CDI needs to be seperate from the display on the GPS box. It can be
switched between GPS and VOR/ILS. Every IFR GPS installation that I have
ever seen in an airplane with an HSI switches the HSI between the GPS and
the VOR/ILS. Note: a while ago (I can't define "a while") there was a
requirement that if the HSI (or CDI) was displaying the GPS info, it
would automatically be switched to the NAV radio when the NAV was tuned
to a localizer frequency. This is no longer a requirement. My
installation is not set up that way.

Thanks for clarifying that, L.R.
I guess that means I need to add a 106A that will work with both my
300XL GPS and the SL 30, but my budget for the panel is already broke anyway
so that shouldn't be a major problem.

MJC

"L. R. Diu Broff" wrote in message
...
"MJC" wrote in :

wrote in message
...
In addition to the frequency tests mention, the GPS has to display on
an external CDI, there has to be a switch and annunicator to change
that external CDI from VOR/LOC to GPS, and some installations require
an
external
annunicator for Approach Mode.



I apologize if this changes the subject a little, but I'm
wondering
about something related to your comment.
I'm planning a panel for my Experimental (RV7), and it will have
the
Grand Rapids EFIS/AHRS display. For radios, there will be both the
GNS-430 GPS and the SL-30 Nav/Com.
The interesting part about the setup is that both radios can be
switched
to display and drive the HITS on the EFIS (if I understand the specs
correctly).
So, the question is: Is a HITS display driven by either a
certified GPS
or a certified NAV signal a "legal" equivilant for a separate CDI
instrument?

MJC



The CDI needs to be seperate from the display on the GPS box. It can be
switched between GPS and VOR/ILS. Every IFR GPS installation that I have
ever seen in an airplane with an HSI switches the HSI between the GPS and
the VOR/ILS. Note: a while ago (I can't define "a while") there was a
requirement that if the HSI (or CDI) was displaying the GPS info, it
would automatically be switched to the NAV radio when the NAV was tuned
to a localizer frequency. This is no longer a requirement. My
installation is not set up that way.

As I understand it, the following are required to certify
the Apollo 2001 for APPROACH.
1. The IFR version of the 2001. This has a different
set of circuit boards from the VFR version.
2. A CDI that is in the pilot's view. Only some VOR
CDIs can take an external DC input, so you may need a new CDI.
You might be able to get away with a CDI meter movement from
an old Omnigator if you can find a suitable spot for it.
3. An annunciator panel with a few switches and lights
4. Serialized barometric input. Most installed encoders
and transponders use parallel.

BTW I've been told that the 480 with WAAS does not require the
baro input.

Start saving your dimes for a 480.

--
Chuck Forsberg www.omen.com 503-614-0430
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 FAX 629-0665