HOT-STOP® 'L' Heli-L – Aircraft Lithium-Ion Battery Fire Containment Bag

For proper readiness, the HOT-STOP® ‘L’ helicopter fire containment bag should be stored unzipped with the pull strap positioned over the hook-and-loop closure. This staging method allows the bag to be deployed quickly during a lithium-ion battery thermal runaway event.

Because the bag is made from flexible, fire-resistant materials, it can be stored compactly in cockpit or cabin compartments where emergency equipment is easily accessible. Operators should periodically check the zipper and apply a light beeswax lubricant to ensure smooth operation.

To deploy the bag, crew members should first retrieve the containment kit and put on protective gloves. The overheating or damaged electronic device should then be carefully placed inside the bag beneath the internal baffle system.

Next, pull the red “PULL” tab to close the hook-and-loop seam and zip the bag completely until the zipper reaches the stopper. Properly sealing the bag ensures the containment system can effectively control heat, flames, and smoke from the lithium-ion battery event.

Yes. HOT-STOP® ‘L’ fire containment bags are backed by a lifetime replacement warranty if the bag is deployed during an actual lithium-ion battery thermal runaway incident.

After such an event, operators must complete an incident report and return the used bag to the manufacturer for evaluation and replacement. This warranty program reflects the manufacturer’s confidence in the bag’s fire containment capabilities.

The HOT-STOP® ‘L’ containment system has undergone extensive burn testing in FAA-registered laboratories. Official burn test certificates and supporting documentation are available through the manufacturer.

These tests demonstrate the bag’s ability to withstand extreme heat, pressure bursts, and smoke generation associated with lithium-ion battery fires. Operators may use this documentation during safety audits or regulatory compliance reviews.

The HOT-STOP® ‘L’ containment bag is constructed from multiple layers of fire-resistant fabric combined with an airtight zipper system and internal baffles. These design elements help trap flames, heat, and toxic smoke inside the bag.

Once sealed, the bag restricts oxygen flow and prevents the spread of flames or hazardous fumes within the aircraft cabin. Correct deployment and full zipper closure are critical to maintaining the integrity of the containment system.

Yes. HOT-STOP® ‘L’ containment bags are designed with shielding materials that can limit cellular and radio frequency signals from devices placed inside the bag. By preventing a damaged device from attempting to reconnect to cellular networks, this shielding can reduce additional heat generation and help stabilize the device during a thermal runaway event.

Operators should regularly inspect the bag for any signs of wear or damage. Key areas to check include the zipper teeth, zipper stitching, pull-tab strap, and the outer fire-resistant shell. If cuts, abrasions, or structural damage are discovered, the bag should be removed from service and returned for repair or replacement. Storage pouches and strap assemblies should also be checked to ensure they remain in good condition.

The containment bag is designed for intuitive, rapid deployment during an emergency. However, flight crews are encouraged to review the manufacturer’s Standard Operating Procedures (SOP) videos and training materials.

Many helicopter operators incorporate HOT-STOP® ‘L’ deployment procedures into their emergency equipment training programs so crews can respond quickly and confidently during a battery fire incident.

Maintenance requirements are minimal. Operators should perform regular visual inspections and occasionally apply beeswax to the zipper to maintain smooth operation. The bag should be stored clean, dry, and unzipped so it remains ready for immediate deployment during an emergency.

HOT-STOP® ‘L’ containment bags are designed for single-event use during an actual lithium-ion battery thermal runaway incident. After deployment in a real event, the bag must be returned under the manufacturer’s lifetime replacement warranty. If the bag has not been used in an incident and remains undamaged, it may continue to remain in service or be used for training demonstrations.

Because fire containment bags are generally classified as loose tools or onboard safety equipment, a Certificate of Conformance (CofC) is not typically required. However, a CofC may be issued upon request if an operator requires documentation for internal compliance procedures or procurement records.