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TOST Connecting Ring Pair
TOST Connecting Ring Pair TOST Aeronautical Standard LN 65091 TOST Connecting Ring Pair

TOST Double Tow Ring

Sale Price: $44.00

SKU: 5235


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Detailed Description

TOST Connecting Ring Pair

General Description

TOST Connecting Ring Pairs are forged from a fine steel cast. The small ring and large ring are caste into each other without a weld. This is a difficult and elaborate process.

TOST connecting ring pairs are vital for safe connection and reliable separation of tow cables and tow releases. The type certification stipulates that every TOST tow release must be operated only wit a ring pair meeting the Aeronautical Standard LN 65091. Rings must be stamped with the manufacturer's name and standard number.

Welded rings are prohibited!

Use of welded rings voids tow release warranties. Welded rings cause damage to releases. Also, undersized or deformed rings can cause the ring pair to jam the release and inhibit correct operation under load, a potential danger for the pilot.

Connecting ring pairs must be visually checked and measured at regular intervals. Ring pairs that deviate from standard dimensions must be replaced.

2005 Edition of LN 65091

The links of the connecting ring pair shall not be welded!

Permissible constant load:

The permissible constant load shall not exceed 15 kN (i. e. it must withstand this load without deformation). A momentary (3 seconds) load of 18 kN is permissible.

Operation and technical specification:

Prior to each commissioning of the connecting according to LN 65091 testing shall be carried out for scratches, cracks and burrs in accordance with DIN EN ISO 8785 as well as for permanent deformation.

Surface imperfections and permanent deformation shall be determined by visual inspection. The detectable deformations and surface imperfections, which were determined during the test, are not permitted.

All connecting ring pairs supplied according to this standard shall be accompanied by an EASA Form-1 issued by the manufacturer for each production lot.

*Actual color may vary from pictures

Connecting Ring Dimensions

The Aeronautical Standard LN 65091 specifies characteristics of connecting ring pairs for tow releases, tow launching of aircraft, non-controllable tow-trailers and for winch launching for aerospace applications.

Connecting Ring Dimensions

Why Buy From Us?

Wings & Wheels has been serving the sport aviation and soaring community for more than 20 years.  We have the largest and most comprehensive inventory of sailplane and soaring supplies.  Nearly everything you find here is in stock and can ship the same day.  We are here for aviators, businesses, mechanics and government.  Our goal is to fulfill your order promptly and as conveniently as our resources allow.

Wings & Wheels is proud to be the American representative for HpH Ltd, producer of the finest quality 304 sailplanes.

Our staff has over 8,000 hours of flying experience in gliders and airplanes. Wings & Wheels is staffed by Sean, Garret, Miki, Matt and Linda. You will have a friendly voice pick up when you call. Our staff is trained to promptly take your orders and ship your products.

Shipping Information

Same Day Shipping

Orders placed by 3:00 pm PST Monday-Friday for “off-the-shelf“, in-stock items are normally shipped same day by UPS.  Although we stock the vast majority of the items on our online store, we cannot assure that they will all be on hand at all times. We ship every order as quickly as possible, and in the event of a delay, be assured that we are working hard to get your order shipped promptly. Due to order volume during holidays, we cannot guarantee that all orders placed can ship on the day after the holiday closure. 

Orders for special cut products may take a few days to ship depending on order volume. Special order products ship based on the lead times of each manufacturer. 

Shipping Service

UPS LogoUPS Shipping

UPS orders will need to be placed before 4:00 pm EST and 4:00 pm PST Monday-Friday to ship out the same business day.  We apply UPS retail rates to calculate shipping costs.  Packages may not qualify for actual wieight due to size.  If dimensional weight is applied by UPS your shipping & packing rate will be adjusted.  Packages are only insured aganst theft if signature delivery is accepted.  Request signature delivery.


Priority Mail & 1st Class order has to be placed by 11am. We will use the flat rate box service if your parts fit in the box and the service cost is less than USPS Priority Mail. USPS may not always have tracking information available.  If you request lower cost USPS shipping you agree to accept all responsibility for lost, stolen and damaged packages.

Delivery Timing

UPS Ground Delivery

USPS Delivery Timing

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