Which of the following is also a continuous loop system used in DoD aircraft?

• A. Inconel loop
• B. Systron Donner system
• C. Photoelectric cell devices
• D. Optical detectors

Answer: (B)

A continuous loop system is a closed feedback setup where the device continuously measures angular motion and uses that response to drive corrective action, keeping the instrument or platform stabilized. The Systron Donner system is known for this type of closed-loop gyro/servomechanism used in DoD aircraft, where a gyroscopic element is kept in balance by a servo loop that cancels sensed motion and outputs a precise rate or attitude signal. In other words, the system constantly feeds back its output to reduce error, providing accurate stabilization and navigation data. The other options don’t describe a closed-loop gyro or stabilization system: Inconel loop refers to a material loop, not a feedback system; photoelectric cell devices and optical detectors are sensors, not continuous loop control systems.