Radar altimeter
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Unless I am misunderstanding something, it seems that the decision height indication is not working.
According to the manual: "When passing the decision height in a descent, the
integrated, yellow, decision height indicator will illuminate, as well as the connected indicator on
the KI 256 attitude indicator."For me, unfortunately the DH indicator seems to be always illuminated on the radar altimeter no matter if I am cruising or descending below DH.
Minor detail in the text as well. As far as can tell the Duke also doesn't have a KI 256 installed - perhaps a leftover text from one of the other planes?
Flying the Turbine duke for reference. -
I see no problem over here with the indication, but you're very right about the old language from the manual. I'd be happy to look at a screenshot or video of the indicator if you wanted to share.
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@Black-Square
A delayed response as I had to find time to fly to check that I wasn't overlooking something and get screenshots.In cruise:
The needle has moved away from off and nothing noteworthy.After passing the DH during descent:
Nothing I can find has changed - no illumination visible. So either the lamp is incredibly weak, or it is not working on my side.
After shutdown I can't detect the DH indicator getting any darker:
This was in daylight but not with direct sun on the gauges. I might do another test in the dark to see if i can spot any light just to be sure.
Looking through documents online for the KI-250 indicator unit for the KRA-10A Radar Altimeter System, it should also include a 2 second aural warning in addition to the illumination(and a self test mode)? Perhaps nice features to include in the future (which might even bring more sub-parts that could fail individually). Or maybe the audio output is just not connected up on this particular panel installation?
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@Avionic The little yellow DH spot on the indicator's face does illuminate for me, but then goes off when I'm well below the DH pointer. In your middle picture, you're probably too far below for it to light up. Try to fly at around height of 500ft and move the DH pointer around your indicated height, you should see it light up when you move it just past your current height.
Though I don't hear any alarm sound when it lights up :(
This is how it looks for me on and off:
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I was just doing a test with night flying and saw it come on very briefly (
perhaps the 2 seconds that the audio should play?). Tested a bit more and it stays illuminated longer the less VS you pass it with, so it is just connected to distance below DH selected.
The lamp is however supposed to stay illuminated untill you reach 20 feet AGL so it should have stayed on for my screenshot.
