Leading edge devices can be retracted by the standby hydraulic system

Question

BlackTom AI · Accepted Answer

The statement to evaluate is: 'Leading edge devices can be retracted by the standby hydraulic system.'

First, consider what standby hydraulic systems are typically used for in aircraft. Standby hydraulics are generally provided to support essential or backup functions in case the primary hydraulic system fails. These systems often power critical controls or flight-safety-related components, but not routinely the normal primary flight control surfaces.

Next, examine leading edge devices (such as slats) and how they are actuated. In most aircraft, leading edge devices are controlled by the primary hydraulic system or dedicated actuation circuits that are part of the normal flight-control hydraulics. Their retraction and extension are tied to flight-control logic and aircraft systems that rely on primary hydraulic power, not the standby system.

Therefore, the idea that leading edge devices can be retracted by the standby hydraulic system contradicts the typical design and purpose of standby hydraulics, which is to support essential systems in abnormal or degraded hydraulic conditions, not to control standard, non-emergency surface movement.

Some pilots or maintenance explanations might suggest limits or exceptions for specific aircraft types, but in general aviation training and standard practice indicate that standby hydraulics do not handle the retraction of leading edge devices.

In summary, the claim is incorrect because leading edge device actuation is normally powered by the primary hydraulic system or dedicated control circuits, while standby hydraulics serve backup, essential-system roles rather than routine surface retraction.

AS 411 Exam 03

Leading edge devices can be retracted by the standby hydraulic system

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