Quote:
Originally Posted by
The Ancient Geek 
There is a simple modification which would alleviate the lockout problem.
The LOCK function should only be enabled when both seats are occupied.
This seems to be a good balance between the terrorist risk and the pilot lockout risk.
Sorry, how would you manage this scenario.
PNF goes to toilet. About to open door passenger attempts to enter cockpit as well.
There is a balance of risks.
Sadly suicides tend to chose a copycat method and we would appear to be suffering from a spate of these incidents. There are no totally foolproof answers, we need to take a considered and balanced action to alleviate a new risk which is an unintended consequence of the successful locked door policy.