Regarding the Mode S EHS MMEL / MEL, how does the pilot know if one or more DAP parameters is not functioning properly?

There are no flight deck indications to inform the pilot that the transponder is not sending one or more DAP’s, or the accuracy of the downlinked information. The pilot may be aware, indirectly, due to the failure of sensors which provide information to the transponder, such as the Flight Management System or Air Data System. The Air Traffic Controller may also report lost, missing or incorrect DAP’s, which should be recorded in the aircraft’s techical fault log – to be corrected within the time stated in the MMEL.

Alternatively, lost or missing DAP’s may be discovered during the periodic maintenance check (see JAA NPA 20-12a para 12 and JAA Temporay Guidance Leaflet No. 13 para 12). More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.