FAA Instrument Stage 1 Practice Exam 2025 – All-in-One Guide for Exam Success!

In a typical light general aviation airplane, when the electrical power system for the digital flight instrument fails, redundant power sources are designed to maintain operation. This is a critical aspect of aircraft design, as redundancy in power systems ensures that essential instruments can continue to function even in the event of an electrical failure.

Many modern aircraft, even smaller general aviation ones, may have secondary power sources such as backup batteries or alternative power systems to keep vital instruments operational. This redundancy is crucial for safety, allowing pilots to maintain situational awareness and control over the aircraft despite potential failures in the primary electrical system.

Other options highlight scenarios that would not typically happen in well-designed aircraft systems. For instance, backup instruments do not stop functioning as long as they are designed to operate independently of the primary power source. Similarly, it is not typical for only analog instruments to remain operational without some form of power backup, and a complete shutdown of all systems would compromise safety and operational integrity.