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Section 5 – Procedures Mast Chain Visual Inspection
5.11-1 Chain Thorough examination
1. Remove all chains from the masts following section 5.12 Mast Disassembly Procedure of the manual.
2. Clean off all debris, grease and lubricant from the chain and anchor sections.
3. Lay the chain onto a clean bench.
4. Inspect the full length of the chain using an elongation gauge to ensure no section fails the limits set out in
table 1.
5. Inspect each chain link for damage as set out in the condition inspections table.
▪
For link wear, use a Digital Calliper
▪
For elongation use a Chain Gauge
▪
Visually inspect for the start of crack propagation and other types of damage
6. Inspect anchor points for missing parts, cracks, damage, rubbing or wear.
7. Turn the chain over and re-inspect each chain link for damage as set out in 5.11-2 Condition inspection
table.
8. Replace chain if necessary.
5.11-2 Condition inspection table
Inspection Description Limit
A
Stretched links &
elongated chain
Stretched &
elongated chain
3% across the chain or links
B
Broken or cracked
links
any broken link or start of
crack propagation on any
leaf
C Stiff links
Any lack of free movement
under load
D Worn link & pins
5% material loss on any link,
leaving height of 11.5 mm
E Corroded links Any evidence
F
Turned or
abnormally
protruding pins
Abnormal
protruding pin
Turned pin
Any evidence
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