SLING-LOAD EJECTION DECELERATION SAFETY SYSTEM (SEDSS)
The present invention relates to safety systems for aviation cargo operations, and more particularly to external cargo load safety devices for helicopters conducting sling load operations. Specifically, the invention concerns a parachute-based deceleration system designed to reduce the velocity of an inadvertently dropped external cargo load from a helicopter in flight.
BACKGROUND OF THE INVENTION
In helicopter sling load operations, cargo is suspended from the aircraft using cables or slings that connect the load to a cargo hook mounted beneath the helicopter. While generally reliable, these systems are vulnerable to mechanical failure, unintentional release, or human error. In the event of an inadvertent release, the load may free-fall to the ground, potentially causing significant property damage, injury, or environmental hazard, depending on the nature and location of the drop.
Existing systems attempt to monitor, secure, or cushion loads, but none currently offer a self-contained, rapidly deployable deceleration method specifically suited for external cargo loads released mid-flight. The present invention seeks to fill this critical safety gap.
SUMMARY OF THE INVENTION
The Sling-load Ejection Deceleration Safety System (SEDSS) provides a lightweight, attachable safety mechanism configured to automatically deploy a parachute in the event an external helicopter cargo load is inadvertently released during flight. The system is retrofittable to a wide range of helicopter models and can be installed in under five minutes.
The system comprises a durable, soft-material containment unit affixed directly to the helicopter airframe or skids near the cargo hook, a parachute assembly stowed within the containment unit, a bridle line connecting the sling cable to the parachute, and a mechanical release mechanism triggered by sudden tension loss. Upon load release, the parachute deploys mid-air, decelerating the cargo’s descent and reducing ground impact force.
An integrated Emergency Descent Audio Alert System (EDAAS) is configured to activate automatically upon parachute deployment, emitting a high-decibel alarm to warn personnel below.
DETAILED DESCRIPTION OF THE INVENTION
The SEDSS includes the following key components:
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Containment Bag (Parachute Housing)
Constructed from a highly durable and weather-resistant textile.
Configured for aerodynamic minimal drag and high mechanical wear resistance.
Mountable to the underside of a helicopter airframe or skids in proximity to the cargo hook. -
Parachute Assembly
Stored in a folded state within the containment bag.
Manufactured from aviation-grade parachute nylon or similar high-drag material.
Variable canopy sizes corresponding to different load classes. -
Bridle Line and Attachment Mechanism
A bridle connects the top of the sling line to the packed parachute.
A clip-pin or quick-release mechanism maintains parachute retention until sudden tension loss. -
Cargo Hook and Sling Load Interface
Sling line connects the external cargo load to the helicopter cargo hook.
The bridle line is configured to integrate seamlessly between the hook and the sling. -
Emergency Descent Audio Alert System (EDAAS)
A self-powered, high-decibel alarm.
Mechanically or electronically linked to the parachute deployment sequence.
Activates automatically upon parachute deployment, descending with the load.