AD 2018-02-04
Effective 02/21/2018 · Published 01/17/2018
Airworthiness Directives; Aerospace Welding Minneapolis, Inc., Mufflers
Summary
We are adopting a new airworthiness directive (AD) for certain Aerospace Welding Minneapolis, Inc. mufflers, part numbers A1754001-23 and A1754001-25, installed on airplanes. This AD was prompted by occurrences of cracks or broken welds in the connecting weld of the muffler body to muffler cuff that may allow carbon monoxide exhaust fumes into the cockpit heating system. This AD requires an inspection of the muffler…