QUICK RELEASE BOX, QRB Mk-4

The QRB is the important connection between the rescue man and the hoist system of the helicopter.

Lite Flites QRB is designed with the ability to open under tension up to 150 kg. This is a very important safety feature. When designing the QRB we always focused on the safety of the rescue man as well as the helicopter crew. With the Lite Flite QRB the rescue man is always able to release himself in an emergency situation. If the rescue man get into problems, entangled on a wreckage or stuck between rocks in the mountains, the helicopter has a problem. In this situation the crew could be forced to cut the cable not to jeopardize the helicopter and the crew. If this happens for a helicopter equipped with a single hoist only, the helicopter is not able to get back to rescue the rescue man, and far the less the casualty.

The QRB Mk-4 is manufactured from anti-corrosion treated stainless steel, which makes it extremely resistant to saltwater corrosion. Furthermore the body of the QRB is given a special surface treatment. A very thin layer, less than 5 microns, of carbon and chrome ions is bonded to the surface, making it glass hard, scratch resistant and super smooth. The resulting silk matt, solid black surface adds another important feature; It makes the moving parts less vulnerable to lack of lubrication.

Daily maintenance after use in saltwater, is limited to a quick shower in fresh water. Only once a year, the QRB must be disassembled, cleaned, lubricated with a special aero grade grease and have new stainless springs.

The rescue man has a distinct feeling of the mechanism when operating the lid. Strong springs improves the safety of operation. The color of the lid is black with a lime green bar inserted in the lid. The contrast between the 2 colors enables the crew members from a distance and even in a dark helicopter, to tell if the QRB is in the safe position. As the bar stays 3mm proud of the lid, the rescue man is able to feel, even with gloves, if the bar is horizontal and in safe position.

In 2012 we updated the QRB to Mk-4. The upgrade makes the QRB even more resistant to foreign objects entering the mechanism, due to the improved lifting plate with interconnected lobes. In addition, the redesigned back plate is equipped with a single flush hole only, as this is adequate in order to ensure proper fresh water flushing.

The Lite Flite Quick Release Box is a must to all quality concerned SAR crews.



Suspension Strap

The suspension strap is the connection between the Quick Release Box and the hoist system of the helicopter.

The design allows the middle ring to carry load in both directions. Downwards if you want to carry extra equipment or a dog during the hoist ride, upwards if the rescue man is forced to shift from one hoist cable to another in the air under a dual hoist equipped helicopter.

In addition, it is fully compatible with our Lanyard Connector P/N 60081629, which secures the rescue man when switching between hoist and lanyard hook up.

CE type approval
The QRB and the suspension strap is part of Lite Flites CE type approved and tested Helicopter Rescue System. The CE type approval is in accordance with EU Directive 89/686/EEC regarding Personnal Protective Equipment. Among utilized common European norms are EN358 and EN1497.

Nato Stock Number
The Nato Stock Number 1680-22-309-1736, our P/N 80049010, covers the complete assembly of the QRB and the suspension strap.

Quick Release Box spare parts and accessories can be ordered seperately.





P/N 90019010


P/N 60081471


P/N 80049010 - QRB assembly connecting the rescuers harness to the helicopter hoist hook.

Selected Part Numbers:
Part No   Nato Stock No   Part Name   
60081471       QRB Suspension Strap NG, 275 mm, A+D ring         
90019010       Quick Release Box, QRB Mk-4         
(Only a few selected part numbers are shown. Please ask for what you do not see.)