AET Study Guide 2026

Modern IRS units use ring laser gyroscopes (RLGs) or fiber optic gyroscopes (FOGs) to measure angular rate without moving parts.

A 12-bit ADC can represent 2^12 = 4,096 discrete digital values, ranging from 0 to 4,095.

Only an FAA-certificated Airframe and Powerplant (A&P) mechanic, Repairman, or authorized repair station representative may approve an aircraft for return to service after maintenance.

Safety wire must be installed so that the fastener cannot rotate in the loosening direction without pulling the wire taut, providing positive locking.

Regular calibration of test equipment is essential in aircraft maintenance to guarantee that all measurements taken are consistently accurate and reliable. Uncalibrated equipment can provide erroneous readings, leading to misdiagnosis of issues or incorrect adjustments, which could compromise aircraft safety and operational integrity. Calibration ensures that the tools perform within specified tolerances, maintaining the highest standards of precision.

A regulated 28V system operates between approximately 27.5 and 28.5 volts to properly charge 24V batteries while powering the aircraft's electrical loads.