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There are some AD's for aircraft but I am not aware of any for the Skymaster. Typically the service manual suggests when engine is overhauled the hoses should be changed. Check the service manual.
Hoses are available with or without fire sleeve. Your mechanic should have sources and can buy the fire sleeve bulk to install on the hoses purchased.
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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