704CH
Well Known Member
This one is a tough one.. Please HELP ! I am working on my IFR Proficiency Now, as you can tell..
When on an ILS, the CDI button should be initiated when joining the localizer to ensure that you have CDI sensitivity vs. VNAV sensitivity that the WAAS GPS would normally be providing during an ILS approach. This is common practice I believe for the GTN650 and 430. Always switch to CDI when joining the localizer? That said, the GTN has two separate Arinc out sources to my Skyview. First is the ?Nav? Source which sources direct from the Nav frequency on the GTN, the second source is the ?GPS? source which sources the GPS information from the GTN. Either of these sources is selectable via the HSI on the Skyview.
So my question is I have a couple options to ?legally? fly the ILS with this equipment.
1) If my Dynon HSI is set for GPS Source while enroute and upon joining the localizer I switch the HSI source to be ?Nav?. This now disregards the GPS Signal and uses the frequency tuned into the GTN Nav. In this case the HSI is flying the actual Localizer signal. This is legal even if the GPS was left on VNAV, i.e. the CDI button was not pushed.
2) If upon joining the localizer I switch the GTN from VNAV to CDI by hitting the CDI button, the GPS then puts out the ?Nav? Signal using CDI sensitivity from the GPS Source, so I could continue to fly the Dynon HSI on the ?GPS? mode. (i.e. without switching the HSI source to ?Nav?.)
3) Alternatively I could Switch both (Skyview HSI and GTN) Modes.. Skyview HSI to ?Nav? and GTN GPS by selecting the CDI button. In this case the Skyview HSI would be flying the ?Nav? signal from the Nav frequency tuned into the GTN Nav, and also the Readout on the GTN and the GPS source from the GTN would put out CDI sensitivity for the Localizer approach. (note in this last option, the HSI wouldn?t care because it was already tuned to the ?Nav? source from the GTN)
Is someone close enough to this problem to Confirm the above ?
Thx
When on an ILS, the CDI button should be initiated when joining the localizer to ensure that you have CDI sensitivity vs. VNAV sensitivity that the WAAS GPS would normally be providing during an ILS approach. This is common practice I believe for the GTN650 and 430. Always switch to CDI when joining the localizer? That said, the GTN has two separate Arinc out sources to my Skyview. First is the ?Nav? Source which sources direct from the Nav frequency on the GTN, the second source is the ?GPS? source which sources the GPS information from the GTN. Either of these sources is selectable via the HSI on the Skyview.
So my question is I have a couple options to ?legally? fly the ILS with this equipment.
1) If my Dynon HSI is set for GPS Source while enroute and upon joining the localizer I switch the HSI source to be ?Nav?. This now disregards the GPS Signal and uses the frequency tuned into the GTN Nav. In this case the HSI is flying the actual Localizer signal. This is legal even if the GPS was left on VNAV, i.e. the CDI button was not pushed.
2) If upon joining the localizer I switch the GTN from VNAV to CDI by hitting the CDI button, the GPS then puts out the ?Nav? Signal using CDI sensitivity from the GPS Source, so I could continue to fly the Dynon HSI on the ?GPS? mode. (i.e. without switching the HSI source to ?Nav?.)
3) Alternatively I could Switch both (Skyview HSI and GTN) Modes.. Skyview HSI to ?Nav? and GTN GPS by selecting the CDI button. In this case the Skyview HSI would be flying the ?Nav? signal from the Nav frequency tuned into the GTN Nav, and also the Readout on the GTN and the GPS source from the GTN would put out CDI sensitivity for the Localizer approach. (note in this last option, the HSI wouldn?t care because it was already tuned to the ?Nav? source from the GTN)
Is someone close enough to this problem to Confirm the above ?
Thx