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About 30 small aluminum brackets and fittings were replaced or reinforced in Apollo lunar modules to rule out the possibility of cracking from stress corrosion.
Stress corrosion monitoring began in December 1967 when small cracks were discovered in LM landing gear struts. Nine fittings were replaced in LM-3, scheduled for the Apollo 9 mission, and six fittings were repaired in LM-4, scheduled for the Apollo 10 flight. About 25 fittings were being replaced on LM-5 and LM-6 and 8 fittings on each of these vehicles were being reinforced.
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