ALL of it.....
You can post here, and, advise the authorities. You do everything you can to prevent DEATH. As for the 748, it could not have hurt to have posted here, but it should not have ended with just a PPRUNE post.
“Authorities" in Africa are often bought off. Some on constant payroll of certain commercial endeavors. Even if they are not corrupt they may be slow in action. Most of the time you cannot combat this by notifying the "authorities" alone. You must "Notify" those whom stand to loose. Generally that is the people paying or otherwise using the shoddy aeronautical enterprise.
The more people that know, the better. Notifying the “authorities” alone is simply not enough.