How does the BAK-14 support system pendant retract into the runway trough?

The BAK-14 support system pendant retracts into the runway trough using a pneumatic system. In such systems, pressurized air is utilized to drive mechanisms that control the movement of components. When the pendant needs to retract, the pneumatic system activates, utilizing the force of compressed air to pull the pendant back into the trough smoothly and efficiently.

A pneumatic system is often preferred in this context due to its ability to provide quick and dynamic motion, which is critical for maintaining operational efficiency on runways. It allows for rapid deployment and retraction of the pendant, accommodating the frequent use and changing conditions associated with runway operations.

In contrast, other systems such as mechanical, hydraulic, or gravity-driven systems do not apply in this scenario as they either lack the precision and speed required or operate on different principles that would not suit the specific needs of the BAK-14 support system.