A question for anyone with a better understanding of the actual equipment installed in this airplane.
In the avionics suite installed in my airplane, we have the ability to set the MDA/DA separately from the altitude in the altitude alerter window. This does two things: It superimposes a MDA line on the altitude tape, and it triggers two aural alert, "approaching minimums" and "minimums".
I don't see any mention of similar alerts in the NTSB briefing one the CVR, but of course it's not a complete transcript.
Would the system installed in the accident airplane have a similar capability, and would you expect similar aural alerts approaching and reaching MDA?