Squawk Box

February 2009 Issue

Heating And Cooling

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.

A mechanic found the same problem on two identical aircraft:, "The carburetor heat control arm (p/n: D4F-7326-12-00-1) broke off the carburetor air box, causing uncontrolled selection of carburetor heat versus ram (cold) air intake." The mechanic recommends installing thicker material on the carburetor heat control arm lever, or a different welding/heat treating process, or a different attachment provision altogether.

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