The center of gravitiy CG is not the same as MAC but it is usually located between 25 and 33% of the main wing's MAC.

More acronyms:
STOL - Short Take Off and Landing
PCM - Pulse Code Modulation
EMC - Electromagnetic Compliant

I don't know how it is in the US, but the electric designations here in yurope are:
Power: P - unit: W (watt)
Current: I - unit: A (ampere)
Voltage: U - unit: V (volt)
Resistance: R - unit: W (ohm)
Energy: E - unit: j (joule)
Frequency: f - unit: Hz (hertz)
Period: T - unit: s (seconds)