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I've noticed that on some older planes they will have a "glass" VSI but all of the other instruments will be the old "steam guages". I've seen this on WN 733's and in a few cockpit shots of DC-8's. Why did they choose only to install a new VSI? Might be a dumb question but I'm really curious about it.
I haven't seen one used as a navaid, but I don't see why that's not possible.
The TCAS function on the VSI shows a distance arc from your aircraft and targets aircraft with transponders on it.
If you get a traffic advisory, the blip for that airplane turns yellow, and you get an audible voice as well. A resolution advisory turns the blip red, and an arc appears on the VSI to prompt the required descent or climb. You also get an audible voice telling what to do.
While taking a class in CRJ systems here at school, I got to wondering why they dont use the voice of "Frau" from Austin Powers for any warnings/resolution advisories. Would certainly get your attention.
FedEx has glass VSI's, they can update and make glass PFD's and HSI's but that costs $4 mil to do on one 727, and that upgrade is worth more than the aircraft.
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