Whilst there is a degree on consensus in this tread, I fear that it could fade away with the usual negative conclusion; - we have a problem, it is a hazard, not much is happening.
Thus I question what are we doing about it? How have those operators who are coping changed? How to El Al or others maintain the communication element of CRM with locked doors? Any new ideas out there? Share a CRM safety tip if you have one, let us look for the positives in this thread.
I will kick off with a ‘Gosport tube’ … seriously! A simple, minimum technology communication device that could be used for speech or sound coded messages. Then there is the optical version; known as a mirror, or probably a series of mirrors (fiber optics now days). Both of these systems would enable a 40 min ‘peep’ and ‘squeak’ check on the flight crew.