Harken 2234 Bosun's Chair - Manual (Page 5)

03/11/13 Bosun's Chair — General 5
Do not depend on snap shackles; tie each lifting rope or use approved
carabiner, hook, or D-ring for industrial applications. Use both stainless
triangles using a secure locking knot. Secure unused snap shackle out of
the way so it does not catch.
WARNING! Snap shackles can open suddenly. Any shackle,
even stainless steel “D” shackle versions, are subject to stress
corrosion. Tie each lifting rope or use approved carabiner,
hook, or D-ring for industrial applications.
GENERAL Attaching Halyards/Lifting Ropes
Always use two lifting ropes when going aloft, one attached to bosun's
chair and one attached to separate full-body harness.
WARNING! Both equipment and people can fail to secure a
suspended person—using only a single lifting rope greatly
increases risk of falling. Always use a separate lifting rope
attached to a separate full-body harness.
Do not depend on snap shackles; tie each
lifting rope using knot shown on pages 8-9 or
use approved carabiner, hook, or D-ring for
industrial applications.
CORRECT
Snap shackles can open suddenly.
Also any shackle is subject to stress
corrosion and may fail suddenly.
INCORRECT
Always secure halyard or other attachment system to BOTH triangles.
Make sure steel triangles are seated flat in webbing
INCORRECT INCORRECT CORRECT
Shackles may have been stressed in other load
applications while sailing. Overloading is not
always apparent, especially when using high-
load stainless steel such as type 17-4. Stress
corrosion in this material is only detectable
using dyes or X-ray imaging.