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 TB 55-1900-201-45/1
test or by a test with electronic or ultrasonic devices or other non-destructive testing (NDT).
c. For certification, testing of the assembled units under proof loads, followed by a disassembly of such gear for a
thorough examination shall be made once every four (4) years, or more often if necessary. The "disassembly" of units of
gears is necessary to determine the suitability of such gear for continued service.
d. Quadrennial inspections and certification of cargo gear shall be performed by one of the following approved
certifying organizations:
(1)
National Cargo Bureau
(2)
International Cargo Gear Bureau
(3)
Universal Cargo Gear Survey and Certification Bureau
2-35. Factors of Safety. In the testing of the cargo gear, the safety factors in Table 2-2, shall be used and regarded as
minimum.
Table 2-2. Safe Working Loads for Component Parts
COMPONENT PARTS
SAFETY FACTORS BASED ON
ULTIMATE
YIELD
BREAKING
STRENGTH
POINT
TEST LOAD
All metal structural parts, except steel booms:
When the working load of the assembled gear is 10 tons*
` **
5
or less
When the working load of the assembled gear is 13 tons or
`
4
over
Steel booms:
When the working load of the assembled gear is 10 tons or
`
3
less
When the working load of the assembled gear is 13 tons or
over
` 1/2
2
Wooden structural parts
'8
Chains
4
Wire Rope:
For working loads 10 tons or under
5
For working loads over 10 tons4
4
Fiber rope:
When intended for running rigging
7
When intended for fixed gear & vangs
5
2-21
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