General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

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What occurs if the ADIRU switch is selected to 'off' during flight?

The ADIRU is powered off completely
Nothing, it remains powered due to system logic
The aircraft alerts the crew with alarms
The system resets automatically

The correct answer is: Nothing, it remains powered due to system logic

Selecting the ADIRU switch to 'off' during flight typically results in the system remaining powered due to the inherent system logic designed to ensure aircraft safety and continuous operation. This design prevents accidental shutdowns that could jeopardize navigational and flight data systems while in the air. The ADIRU (Air Data Inertial Reference Unit) is a critical component, providing essential data such as altitude, airspeed, and navigation parameters. If it were to power off completely (which would be indicated by other choices), it could lead to significant operational issues for pilots who rely on these data for safe navigation and aircraft control. In practical terms, even when the switch is in the 'off' position, the ADIRU often continues to function because of protective measures and integrated logic within the aircraft systems to maintain navigation continuity and safety during flight operations. This characteristic of the ADIRU system offers an added layer of reliability, particularly in the demanding environment of airborne operations.