TOST Weak Link Protective Sleeve

General Description

TOST Weak Link Protective Sleeve - Protect the weak link against deformation, premature wear and tear, and uncontrolled change of breaking load.

TOST protective sleeves are manufactured from stainless steel. They have inspection holes on both sides to check for the correct weak link insert and its condition. 

Single System: uses one Primary Weak Link. Reserve System: uses 1 Primary Weak Link and 1 Reserve Weak Link.

Use above selections for TOST Protective Sleeve selection.

P/N

SKU

Applicataion

111000

5061

Single-insert weak link (1 Primary Weak Link)

111200

5068

Reserve-insert weak link (1 Primary Weak Link and 1 Reserve Weak Link)

111030

5067

DISCONTINUED

CRG – Tow Cable End Piece (Holds 1 Weak Link)

FAR Rules on Glider Towing

FAR 91.309 Towing: Gliders: (3) The towline used has breaking strength not less than 80 percent of the maximum certificated operating weight of the glider and not more than twice this operating weight. However, the towline used may have a breaking strength more than twice the maximum certificated operating weight of the glider if–

(i) A safety link is installed at the point of attachment of the towline to the glider or unpowered ultralight vehicle with a breaking strength not less than 80 percent of the maximum certificated operating weight of the glider and not greater than twice this operating weight;

(ii) A safety link is installed at the point of attachment of the towline to the towing aircraft with a breaking strength greater, but not more than 25 percent greater than that of the safety link at the towed glider end of the towline, and not greater than twice the maximum certificated operating weight of the glider.

TOST Weak Links

Tost weak links in their optimized format combine the following improvements:

  • Longer service life
  • Correct marking with load group and manufacturer’s name
  • Made of high-quality certified aircraft steel
  • Clear distinction from inferior copies
  • Manufacturing tolerance only 5% (10 % are demanded in the requirements)

Like our type-approved products, our weak links are also manufactured according to
EASA approved production methods. Each batch is tested on computerized test equipment and the
results are documented. This guarantees consistent high quality and traceability

Important Notes

Weak links protect your aircraft against overloading

  • Use only the weak link stipulated in your aircraft TCDS or aircraft manual
  • Checking the cable preamble is mandatory according to SBO (German Gliding Operation  Regulations); this includes the inspection of weak links
  • Replace the weak link immediately in the case of a visible damage
  • We recommend that the weak link inserts are replaced after 200 starts:

 an insert exchanged in time is always safer and cheaper than one single aborted launch

  • Always use the protective steel sleeve
  • Use only the correct shackles: they prevent the weak link and the steel sleeve from twisting,  leading to an undefi ned increase of the breaking load
  • Never use two equal inserts, eg, both with round holes, in a reserve system, since this would double the breaking load

Warning
Using combinations of weak link inserts from diff erent manufacturers can double the breaking
load because of the elongation of inferior inserts! 

Connecting Ring Pairs

Connecting ring pairs are vital for the safe connection and reliable separation of tow cable and tow release.

The type certification stipulates that every Tost tow release must be operated only with a ring pair meeting the Aeronautical Standard LN 65091 (in its respective current edition).

 These connecting ring pairs must be stamped with the manufacturer‘s name and the standard number.

Welded rings are categorically prohibited.

Their use voids the warranty of our releases. Welded rings cause damage to the releases. Moreover, 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 the standard dimensions must be replaced.

Wings & Wheels typically stocks all TOST Weak Link Protective Sleeves.

Always use TOST Tires and Tubes when available.

See "Tech Data" tab for Description, Application and Technical Data.

See "Docs" tab for "TOST Tire, Tube & Wheel Selection Guide".


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