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AS350 HYDRAULIC SLING CARGO HOOK KIT

Onboard System's new AS350 Sling Hydraulic Cargo Hook kit has been STC certified by the FAA and Transport Canada (EASA pending). Our innovative TALON LC hydraulic hooks are designed to minimize the risk of inadvertent cargo releases caused by excessive movement during external load operations, which can activate an improperly rigged manual release cable on a cargo hook system. Hydraulic hook systems allow for simplified cable routing along the belly of the aircraft, and snagging or damage to the cable will not lead to accidentally dropping the cargo.

Eliminates the common causes for inadvertent releases

Recently, Onboard Systems has pioneered and developed hydraulic technology to serve as the emergency release for a number of critical reasons. The United States Department of the Interior Aviation Management released a Technical Bulletin dated July 16, 2004 that outlined common safety issues involved in inadvertent cargo hook releases. Their major findings were:

  • Cables must be rigged to exact specifications each time the hook is installed
  • Cables are prone to damage that can cause a load release AS350 Hydraulic Sling

The Onboard hydraulic release mechanism consists of a small, self-contained hydraulic reservoir that is used to open the hook. It does not use any hydraulic power from the aircraft. The hydraulic release is activated with a cabin-mounted lever that incorporates a compact master cylinder. A slave cylinder integrated in the cargo hook interfaces with the release mechanism.

System Advantages

The hydraulic release offers significant advantages for installation, maintenance and operation:

  • Installation — Manual "push-pull" cable release systems need to be installed with very precise limits in order to make sure the system performs properly. A mistake one way could prevent the system from opening the hook; a mistake the other way could lead to the system accidentally opening. The nature of the cabled systems requires very large radius bends. The hydraulic system is not subject to any of the tight rigging requirements and can be installed with very tight bends, offering greater flexibility in routing the cable from the hook to the flight controls.
  • Maintenance — For similar reasons maintenance is simpler with a hydraulic system. A dry-break, quick-disconnect allows the hook system to be removed without any hydraulic fluid loss or need to bleed the complete system.
  • Operation — If a mechanical cable gets snagged or hit by the load it can inadvertently open the hook causing the loss of the cargo. The hydraulic system will only open the hook when the pilot activates the release handle — snagging or damage to the cable will not lead to accidentally dropping the cargo.

For more information, visit our Eurocopter AS350 Sling product page.