451: Hidden Tachometer on A2A C172R

This morning I received an email from Paul Wasserman who asked me why the red line on my A2A C172R tachometer is set at 2,400 rpm, rather than 2,700 rpm as shown on his cockpit.   Looking at his photo, I was bewildered because I had never seen the gauge before; and it was the first time someone reported to me about this inconsistency.

In order to confirm that there were nothing I had missed, I re-downloaded, re-installed and re-updated the aircraft in the following hours.   “Without luck”, the result was the same — the red line is still at 2,400 rpm.   I really had my head scratched. Continue reading