Noske
I think that Gerry Soejatman did a good job in his blog articles to explain how these pilots could end up heading for Mount Salak, without doing anything unusually stupid or daring.
How are you qualifying the descent below MSA over those mountains?
Noske
Nevertheless, this accident should never have happened in an aircraft equipped with EGPWS (or TAWS, or T2CAS, or whatever you call it). That's what I'd hope to learn from the CVR: was the TAWS trying to warn them at all?
This accident should never have happened in any IFR equipped aircraft on an IFR flight plan, regardless with or without the terrain avoidance gadgets.
Itīs wise to plan and fly in a way, that those systems keep quiet all the time.
It might be interesting, wether the system was operational, operational but malfunctioning, operational but not switched on, but mainly in relevance to the mindset of the crew.