[NY Attitude]

ATR = Radar Technician and ATN was for communication equipment. ADR as you said was for recips and ADJ was for jets. As for the question, are we discussing a regenerative feedback circuit? Since the company I work for provides equipment to the US and other Navies, the highest maintenance level for the US Navy is O level both for aircraft and for shipboard equipment.

[tongue-tied]

ADJ...that's right. Was before my time.

No, generally they ask about simple meter circuitry.

This past week I learned about the main fuel control, and how different parts of it provide governing and control though mechanical means. Amazing to me, to see how fuel pressure, air pressure, and RPM measurements can be used to give the same control as a feedback circuit on an electronic system.

Self-correcting power and rotor RPM design through a "carburetor". Who knew?!