Slow Descent: even at a major airport (DTW), your ADI might indicate that you are on the glideslope-a few miles before you get to the actual glideslope intercept point...but the HSI repeater might not show it.
Shuttlebus:
Are you assuming that the aircraft has some automation, or that it can have the older technology, and with two or three c0ckpit crewmembers? The subject can become ultra complex.
The twin-turbofans planes which we fly have no map mode-an ADF, 2 VORs and only two pilots, plus altitude hold.
Read up on an incident at Las Vegas (LAS), which involved a highly-automated aircraft, if you can find it. They almost crashed and apparently there were no system malfunctions. It is possible to imagine, especially if partial automation is used. When I went around at LAS years ago in a 757, due to Approach control abruptly squeezing in a B-737 on final, I told the Captain, "let's stay over the valley lights, no matter what vectors they give us, there are no mountains there".There have been many major incidents, due to the lack of understanding newer c0ckpits, and with partial automation engaged.
This type of confusion was supposedly much less common with "classic" aircraft.