We are 4M Sigma Corporation located in Seattle, Washington, and in business for 23 years. We have supported commercial aircraft operations with design, manufacturing, calibration and repair solutions since 1992. This includes building proprietary electrical designs used both in the air and on the ground. We have flight hardware on aircraft as new as 737NGs and as old as MD-80s. Our operational support equipment and electrical/electronic, mechanical, hydraulic, and pneumatic test equipment, and specialty tooling interfaces with most Commercial Aircraft. These equipments are in use in 220 countries Worldwide at line stations, ramps, hangars, and backshops.

We build 4M Sigma-unique designs and airline-unique designs including:

We also build to customer-supplied prime and subtier drawings: