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Army MOS · Engineering

91C Utilities Equipment Repairer

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

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Overview

A Utilities Equipment Repairer performs field and sustainment level maintenance on utilities equipment. They also maintain special purpose support systems and supervise maintenance work.

Minimum ASVAB: GM 93

ASVAB policy: Not policy-reviewed · coverage unknown · as of 2026-10-18

Program scope has not been reviewed.

Policy applicability and coverage of the program's score routes have not been reviewed. Shown-route arithmetic is not an eligibility decision.

Source: smartbook-611-21-ch10c-fy2025 (source date 2025-12). Policy applicability has not been established.

See if you would hit this score: free ASVAB practice test

Core Skills

  • Air-conditioner electrical and vapor-system repair
  • Refrigeration-unit electrical system inspection and repair
  • Portable-heater fuel and electrical system repair
  • Fire-extinguisher recharging equipment and valve maintenance

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Heating, Air Conditioning, and Refrigeration Mechanics and Installers

Inspection and repair of military air-conditioning, refrigeration electrical systems, and portable-heater fuel and electrical systems directly overlap with civilian HVAC service work.

How to prepare: Ask an HVAC program or apprenticeship sponsor to assess your documented military training for remaining installation and service gaps before choosing coursework. Some states and localities require technician licensing, separate from EPA refrigerant certification.

What the civilian work involves
  • Test electrical circuits or components for continuity, using electrical test equipment.
  • Study blueprints, design specifications, or manufacturers' recommendations to ascertain the configuration of heating or cooling equipment components and to ensure the proper installation of components.
  • Discuss heating or cooling system malfunctions with users to isolate problems or to verify that repairs corrected malfunctions.

Maintenance and Repair Workers, General

Maintenance of utilities equipment, heater systems, refrigeration electrical systems, and valves provides a practical foundation for broader equipment maintenance and repair.

How to prepare: Request a hands-on skills assessment from a facilities maintenance employer to identify building-system repair gaps beyond your military utilities equipment experience.

What the civilian work involves
  • Inspect, operate, or test machinery or equipment to diagnose machine malfunctions.
  • Repair machines, equipment, or structures, using tools such as hammers, hoists, saws, drills, wrenches, or equipment such as precision measuring instruments or electrical or electronic testing devices.

Training & Development

Choose credentials for your target role. COOL funding markers describe program listings, not a guarantee of eligibility or funding.

Getting Started

  • Section 608 Technician Certification (Universal)

    Support refrigerant service across all Section 608 equipment types rather than limiting certification to one equipment category.

    Eligibility and preparation: Pass the EPA-approved certification tests for all equipment types through an approved certifying organization; Universal requires a proctored core test, not an open-book core result.

    For: Heating, Air Conditioning, and Refrigeration Mechanics and Installers

Notes & Sources

  • EPA Section 608 certification applies to covered work that could release refrigerants, not every HVAC or maintenance task; certification must cover the equipment type. Apprentices are exempt only while closely and continually supervised by a certified technician.
Evidence for this guidance (5 documents)
  1. Army National Guard: 91C Utilities Equipment Repairer

    [1] Overview and Job Duties; rendered official recruiting page retrieved through Jina Reader

    Supports: Air-conditioner electrical and vapor-system repair, Refrigeration-unit electrical system inspection and repair, Portable-heater fuel and electrical system repair, Fire-extinguisher recharging equipment and valve maintenance, Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00), Maintenance and Repair Workers, General (O*NET 49-9071.00)

  2. O*NET: Heating, Air Conditioning, and Refrigeration Mechanics and Installers

    [2] O*NET 30.3 occupational data

    Supports: Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00)

  3. Bureau of Labor Statistics: Heating, Air Conditioning, and Refrigeration Mechanics and Installers

    [3] How to Become; Education and Training; Licenses, Certifications, and Registrations; updated August 27, 2026

    Supports: Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00)

  4. US EPA: Section 608 Technician Certification Requirements

    [4] Requirements and Types of Certifications; updated July 15, 2026

    Supports: Heating, Air Conditioning, and Refrigeration Mechanics and Installers (O*NET 49-9021.00), Section 608 Technician Certification (Universal)

    [6]COOL credential mapping: Section 608 Technician Certification (Universal) · 91C cached COOL credential feed

    Supports: Section 608 Technician Certification (Universal)

  5. O*NET: Maintenance and Repair Workers, General

    [5] O*NET 30.3 occupational data

    Supports: Maintenance and Repair Workers, General (O*NET 49-9071.00)

Defense contractor jobs for 91C

Predecessor codes

Historical codes with documented links to 91C. Each history page explains the change.

52C1Utilities Equipment Repairer52C2Utilities Equipment Repairer52C3Utilities Equipment Repairer

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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