Cracks one-half inch long or greater on jack legs require what action?

Cracks one-half inch long or greater on jack legs require what action?

• A. Stop drilled and welded
• B. Replaced
• C. Inspected and monitored
• D. Removed from service

Answer: (D)

A crack that length in a critical load-bearing part must take the equipment out of service. In this case, a jack leg is a load path that supports the aircraft during maintenance. A crack half an inch long indicates a significant loss of structural integrity, and continued use could allow crack growth under load, leading to sudden failure. Removing the jack from service stops any risk of a catastrophic collapse and prompts replacement or repair through proper procedures. Stop drilling and welding aren’t appropriate for this size of crack on a critical member, since repairs here aren’t reliably safe. Inspecting and monitoring would not address the immediate safety risk, and while replacement is the eventual goal, the required action is to take the unit out of service first.

A crack that length in a critical load-bearing part must take the equipment out of service.

In this case, a jack leg is a load path that supports the aircraft during maintenance. A crack half an inch long indicates a significant loss of structural integrity, and continued use could allow crack growth under load, leading to sudden failure. Removing the jack from service stops any risk of a catastrophic collapse and prompts replacement or repair through proper procedures.

Stop drilling and welding aren’t appropriate for this size of crack on a critical member, since repairs here aren’t reliably safe. Inspecting and monitoring would not address the immediate safety risk, and while replacement is the eventual goal, the required action is to take the unit out of service first.