Updated: April 2021

What does a 3E1X1 do?

Installs, operates, maintains, and repairs heating, ventilation, air conditioning and refrigeration (HVAC/R) systems, combustion equipment, and industrial air compressors. Maintains and repairs non-electric kitchen equipment. Manages HVAC and R functions and activities.

Where and How Long is the Tech School For a 3E1X1?

Tech School

98 Days - Sheppard AFB


Electronic Systems Technology

What Does the 3E1X1 Duty Badge Look Like?

Civil Engineer Badge

What are the Demographics for the 3E1X1 Career Field?







Total: 1359

What are the Requirements to Become a 3E1X1?


Mechanical: 47


Electrical: 28


90 lbs

  • Normal color vision.

What are the Duties and Responsibilities For a 3E1X1?

Installs and operates HVAC and R systems and equipment. Interprets drawings and schematics, and installs HVAC and R components. Installs, repairs, fabricates, and tests piping and tubing systems. Installs, connects, troubleshoots, and maintains HVAC and R controls. Tests HVAC and R equipment for proper operation. Balances air and water in HVAC systems. Monitors systems operation to ensure efficiency and compliance technical orders, manufacturer handbooks, local procedures, codes, and directives. Evaluates water treatment for heating and cooling systems. Ensures compliance with safety and environmental regulations for fuels, refrigerants, and hazardous materials.

Maintains, and repairs HVAC and R equipment and systems. Performs recurring maintenance and seasonal overhaul on systems and components. Uses drawings and schematics to analyze and isolate system malfunctions. Troubleshoots malfunctions. Repairs or replaces components. Modifies equipment for specific missions or to increase efficiency.

Maintains tools and equipment. Maintains shop tools and equipment.

Advises on problems installing and repairing HVAC and R equipment and systems. Solves maintenance problems by studying layout drawings, wiring and schematic drawings, and analyzing construction and operating characteristics. Develops and establishes operation and maintenance procedures to ensure maximum efficiency.

Performs planning activities. Performs facility surveys. Surveys proposed work to determine resource requirements. Prepares cost estimates for in-service work. Applies engineered performance standards to plan and estimate jobs. Coordinates plans and other activities.

What Are the Specialty Qualifications for a 3E1X1?

Knowledge. Knowledge is mandatory of: principles of HVAC and R systems, controls, and components; combustion systems; air and water balancing; non-electric kitchen equipment; industrial air compressors; interpreting drawings and schematics; fundamentals of HVAC and R equipment and troubleshooting techniques; industrial water treatment; environmental regulations for fuels, refrigerants, and hazardous materials; and military and commercial publications and environmental regulations.

Education. For entry into this specialty, completion of high school with courses in mathematics, general science, physics, shop mechanics, electricity, and computer fundamentals is desirable.

Training. For award of AFSC 3E131, completion of a basic HVAC and R course is mandatory.

Experience. The following experience is mandatory for award of the AFSC indicated:

  • 3E151. Qualification in and possession of AFSC 3E131. Also, experience in functions such as operation, maintenance, and repair of HVAC and R equipment and control systems.
  • 3E171. Qualification in and possession of AFSC 3E151. Also, experience performing or supervising functions such as operation, maintenance, and repair of HVAC and R equipment and control systems.

For more information on AFSCs and Shredouts check this article out!


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What Are the Possible Assignments for 3E131?

  • Altus, Oklahoma
  • Andersen, Guam
  • Aviano, Italy
  • Barksdale, Louisiana
  • Beale, California
  • Bolling, District Of Columbia
  • Cannon, New Mexico
  • Davis-Monthan, Arizona
  • Dover, Delaware
  • Dyess, Texas
  • Eielson, Alaska
  • Ellsworth, South Dakota
  • F E Warren, Wyoming
  • Fairchild, Washington
  • Grand Forks, North Dakota
  • Holloman, New Mexico
  • Hurlburt Field, Florida
  • JB Andrews, Maryland
  • JB Charleston, South Carolina
  • JB Elmendorf-Rich, Alaska
  • JB Langley-Eustis, Virginia
  • JB Prl Hbr-Hickam, Hawaii
  • Joint Base Lewis–McChord, Washington
  • Joint Base McGuire-Dix-Lakehurst, New Jersey
  • Kadena, Japan
  • Kunsan, South Korea
  • Lakenheath, United Kingdom
  • Little Rock, Arkansas
  • Luke, Arizona
  • Malmstrom, Montana
  • McConnell, Kansas
  • Mildenhall, United Kingdom
  • Minot, North Dakota
  • Misawa, Japan
  • Moody, Georgia
  • Mountain Home, Idaho
  • Nellis, Nevada
  • Osan AB, South Korea
  • Ramstein, Germany
  • Scott, Illinois
  • Seymour Johnson, North Carolina
  • Shaw, South Carolina
  • Spangdahlem AB, Germany
  • Travis, California
  • Whiteman, Missouri
  • Yokota, Japan

Questions and Comments:

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