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Navy NEC · Engineering

B11A Advanced Construction Mechanic

Current service use not established

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

A Navy Enlisted Classification: a skill designation sailors hold in addition to their rating. Part of the Construction Mechanic rating

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Overview

An Advanced Construction Mechanic diagnoses and repairs engines, fuel and electrical systems, hydraulic and pneumatic systems, power trains, and chassis systems. This mechanic also repairs automotive air conditioning systems and performs oxy-acetylene and gas metal arc welding in field and shop conditions.

Core Skills

  • Hydraulic and pneumatic system diagnosis
  • Power train and chassis repair
  • Automotive air conditioning diagnosis and repair
  • Oxy-acetylene and gas metal arc welding

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.

Mobile Heavy Equipment Mechanics, Except Engines

Military diagnosis and repair of hydraulic, pneumatic, power train, and chassis systems directly overlap with heavy equipment troubleshooting and repair.

How to prepare: Practice diagnosing a civilian equipment model using its operating manual and checking repaired components against the manufacturer's performance specifications.

What the civilian work involves
  • Repair and replace damaged or worn parts.
  • Test mechanical products and equipment after repair or assembly to ensure proper performance and compliance with manufacturers' specifications.
  • Operate and inspect machines or heavy equipment to diagnose defects.
Civilian tools and software (examples)
  • Maintenance management software

Bus and Truck Mechanics and Diesel Engine Specialists

Military engine, fuel, electrical, power train, and chassis repair experience transfers directly to diagnosing and servicing bus and truck systems.

How to prepare: Complete hands-on practice with a civilian diesel diagnostic platform, such as Cummins INSITE, to build familiarity with engine-specific troubleshooting.

What the civilian work involves
  • Inspect brake systems, steering mechanisms, wheel bearings, and other important parts to ensure that they are in proper operating condition.
  • Adjust and reline brakes, align wheels, tighten bolts and screws, and reassemble equipment.
  • Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions.
Civilian tools and software (examples)
  • Cummins INSITE
  • Computerized maintenance management system software CMMS

Notes & Sources

Evidence for this guidance (3 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC B11A

    [1] NEC entry "B11A - Advanced Construction Mechanic"; cached text line 2171; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Hydraulic and pneumatic system diagnosis, Power train and chassis repair, Automotive air conditioning diagnosis and repair, Oxy-acetylene and gas metal arc welding, Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00), Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

  2. O*NET: Mobile Heavy Equipment Mechanics, Except Engines

    [2] O*NET 30.3 occupational data

    Supports: Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00)

  3. O*NET: Bus and Truck Mechanics and Diesel Engine Specialists

    [3] O*NET 30.3 occupational data

    Supports: Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

Defense contractor jobs for B11A

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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