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Marine Corps MOS · Aviation

6391 Avionics Chief

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

Avionics chiefs lead avionics departments and supervise the maintenance and repair of aircraft avionics systems, equipment, and components at intermediate and organizational maintenance activities. At organizational maintenance activities, they manage tier III EKMS accounts and assets and oversee avionics manpower within the unit.

Minimum clearance: Secret

Minimum ASVAB: EL 105

ASVAB policy: Not policy-reviewed · coverage unknown · as of 2026-10-19

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: navmc-1200-1l-fy26 (source date 2025-03). Policy applicability has not been established.

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

Core Skills

  • Intermediate and organizational avionics maintenance oversight
  • Tier III EKMS account and asset management
  • Unit avionics manpower management

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.

Avionics Maintenance Supervisor

Supervising aircraft avionics maintenance and repair while managing unit avionics manpower transfers directly to avionics shop supervision.

How to prepare: Build a civilian resume section documenting the maintenance scope, staffing responsibilities, and organizational or intermediate maintenance activities you supervised.

What the civilian work involves
  • Monitor employees' work levels and review work performance.
  • Inspect, test, and measure completed work, using devices such as hand tools or gauges to verify conformance to standards or repair requirements.
Civilian tools and software (examples)
  • Microsoft Excel

Avionics Technicians

Oversight of aircraft avionics systems, equipment, and component repair provides relevant maintenance knowledge for a return to hands-on avionics work.

How to prepare: Complete a practical avionics troubleshooting refresher using circuit testers, oscilloscopes, or voltmeters to assess and refresh hands-on proficiency.

What the civilian work involves
  • Test and troubleshoot instruments, components, and assemblies, using circuit testers, oscilloscopes, or voltmeters.
  • Keep records of maintenance and repair work.
  • Adjust, repair, or replace malfunctioning components or assemblies, using hand tools or soldering irons.
Civilian tools and software (examples)
  • Microsoft Office software

Training & Development

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

Getting Started

  • ASTM NCATT Aircraft Electronics Technician (AET)

    Validate electronics fundamentals, aircraft fundamentals, and maintenance knowledge for civilian avionics work.

    Eligibility and preparation: No mandatory education, experience, or prior certification is required to take the AET examination.

    For: Avionics Maintenance Supervisor, Avionics Technicians

Notes & Sources

Evidence for this guidance (5 documents)
  1. NAVMC 1200.1L (FY26, in force): MOS 6391

    [1] MOS 6391 section "a. Summary"; cached text line 52391; NAVMC 1200.1L signed 2025-03-07, in force until 2026-10-01

    Supports: Intermediate and organizational avionics maintenance oversight, Tier III EKMS account and asset management, Unit avionics manpower management, Avionics Maintenance Supervisor (O*NET 49-1011.00), Avionics Technicians (O*NET 49-2091.00)

  2. O*NET: First-Line Supervisors of Mechanics, Installers, and Repairers

    [2] O*NET 30.3 occupational data

    Supports: Avionics Maintenance Supervisor (O*NET 49-1011.00)

  3. O*NET: Avionics Technicians

    [3] O*NET 30.3 occupational data

    Supports: Avionics Technicians (O*NET 49-2091.00)

  4. COOL credential mapping: ASTM NCATT Aircraft Electronics Technician (AET)

    [4] 6391 cached COOL credential feed

    Supports: ASTM NCATT Aircraft Electronics Technician (AET)

  5. SpaceTEC Partners, Inc.: Qualifications for ASTM NCATT Certifications

    [5] Sole qualifications statement on page; retrieved 2026-09-23

    Supports: ASTM NCATT Aircraft Electronics Technician (AET)

Defense contractor jobs for 6391

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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