Beta 4.5 Nav 1 vs. Nav 2 CDI problem

[JRBarrett 3,077]

Another user had posted that he was having a problem doing a coupled ILS approach from the copilot side using the autopilot transfer switch set to the right side.

I haven't tried that specifically, but I have found that there is an issue with the CDI in the copilot's HSI, being affected by the Nav 1 receiver.

I positioned the aircraft at San Francisco, KSFO on taxiway "C" exactly midway between the thresholds of runways 28L and 28R, aligned with the runway heading of 284 degrees.

I set both pilot and copilot HSI course selectors to 284 degrees. I tuned the number 1 NAV to the 28L ILS I-SFO, frequency 109.55

I tuned the number 2 NAV to the 28R ILS, I-GWQ, frequency 111.7

Initially, everything appeared correct. The pilot CDI was deflected fully left, and the copilot CDI was deflected full right. Both G/S needles were fully up, and the correct morse code identifiers were heard with the audio panel selected to NAV 1, then NAV 2.

However, I found that if I tuned the NAV 1 radio to a non-active ILS frequency, the copilot's CDI centered and became inactive. The copilot glideslope remained deflected up, and the runway 28R ILS identifier was still being heard, but the CDI was dead.

This does not appear to be a case where the NAV 1 ILS localizer is being displayed on the copilots HSI, but unless the NAV 1 receiver is tuned to a valid ILS, the copilot CDI goes dead.

Changing the copilot NAV 2 receiver to a non-active ILS frequency has no effect on the pilot CDI.

This is using a single instance of the RXP GTN750 on the pilot side.

 

Jim Barrett 

[ark 1,291]

21 minutes ago, JRBarrett said:

Another user had posted that he was having a problem doing a coupled ILS approach from the copilot side using the autopilot transfer switch set to the right side.

I haven't tried that specifically, but I have found that there is an issue with the CDI in the copilot's HSI, being affected by the Nav 1 receiver.

I positioned the aircraft at San Francisco, KSFO on taxiway "C" exactly midway between the thresholds of runways 28L and 28R, aligned with the runway heading of 284 degrees.

I set both pilot and copilot HSI course selectors to 284 degrees. I tuned the number 1 NAV to the 28L ILS I-SFO, frequency 109.55

I tuned the number 2 NAV to the 28R ILS, I-GWQ, frequency 111.7

Initially, everything appeared correct. The pilot CDI was deflected fully left, and the copilot CDI was deflected full right. Both G/S needles were fully up, and the correct morse code identifiers were heard with the audio panel selected to NAV 1, then NAV 2.

However, I found that if I tuned the NAV 1 radio to a non-active ILS frequency, the copilot's CDI centered and became inactive. The copilot glideslope remained deflected up, and the runway 28R ILS identifier was still being heard, but the CDI was dead.

This does not appear to be a case where the NAV 1 ILS localizer is being displayed on the copilots HSI, but unless the NAV 1 receiver is tuned to a valid ILS, the copilot CDI goes dead.

Changing the copilot NAV 2 receiver to a non-active ILS frequency has no effect on the pilot CDI.

This is using a single instance of the RXP GTN750 on the pilot side.

 

Jim Barrett 

Jim,

The  Nav2/co-pilot HSI CDI problem was fixed last night. I expect all will work well in the next Beta update.

Al

Edited December 6, 2018 by ark

[JRBarrett 3,077]

29 minutes ago, ark said:

Jim,

The  Nav2/co-pilot HSI CDI problem was fixed last night. I expect all will work well in the next Beta update.

Al

Perfect! Thanks for the update.

Jim B