If an [[Aerotow Rope]] or winch launch cable exceeds the maximum strength requirements established by regulations or manufacturer limitations, weak links or "safety links" must be used.
![[TOST aerotow schematic modified.png]]
Weak links are attached to tow lines or [[Rings]] using shackles and bolts. Weak links may be configured as a single- or double-insert system, with or without a protective sleeve. The single-insert system uses a weak link with round holes. The double-insert system uses two weak links; one with round holes, and one with oval holes. The weak link with round holes serves as the primary weak link, and the weak link with oval holes serves as the reserve weak link; with repeated use over time, the primary weak link may fail at less than the rated strength, so the reserve weak link will take the load for the remainder of the launch. If a protective sleeve is used, the open slot should face towards the glider. The weak links are numbered and color-coded to indicate the rated breaking strength.
![[TOST weak link photo.jpg]]
![[TOST weak link single reserve sleeve.jpg]]
![[TOST weak link load table.png]]
## References
- 14 CFR Part 91
- FAA, *Glider Flying Handbook*
- TOST, *Product Catalog* (2022)
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by Kevin Sakson