mos.directory

Navy NEC · Engineering

U25A LSD-41 Class Propulsion Technician

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.

Browse Navy

Overview

The LSD-41 Class Propulsion Technician safely operates the Advanced Engineering Control System and Machinery Control System aboard upgraded LSD 41/49 class ships using Engineering Operational Sequencing System procedures. This technician maintains the propulsion system and calibrates, inspects, assembles, disassembles, troubleshoots, and overhauls the Colt Pielstick propulsion diesel, associated subsystems, and power trains.

Core Skills

  • AECS-MCS operation using EOSS procedures
  • Colt-Pielstick propulsion diesel troubleshooting and overhaul
  • Propulsion subsystem and power train calibration

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.

Bus and Truck Mechanics and Diesel Engine Specialists

Colt-Pielstick diesel inspection, troubleshooting, disassembly, and overhaul provide directly transferable experience for diesel engine diagnostic and repair work.

How to prepare: Complete hands-on training in truck diesel diagnostics using Cummins INSITE, targeting engine-focused work while building familiarity with vehicle systems.

What the civilian work involves
  • Use handtools, such as screwdrivers, pliers, wrenches, pressure gauges, or precision instruments, as well as power tools, such as pneumatic wrenches, lathes, welding equipment, or jacks and hoists.
  • 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

Motorboat Mechanics and Service Technicians

Shipboard propulsion operation and diesel subsystem maintenance transfer to diagnosing engine performance and repairing marine mechanical equipment.

How to prepare: Take a practical small-vessel engine service course covering engine diagnostic scanners, routine maintenance, and accessories that differ from LSD-class propulsion equipment.

What the civilian work involves
  • Start motors and monitor performance for signs of malfunctioning, such as smoke, excessive vibration, or misfiring.
  • Repair engine mechanical equipment, such as power tilts, bilge pumps, or power take-offs.
  • Perform routine engine maintenance on motorboats, such as changing oil and filters.
Civilian tools and software (examples)
  • Engine diagnostic scanners

Notes & Sources

Evidence for this guidance (3 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC U25A

    [1] NEC entry "U25A - LSD-41 Class Propulsion Technician"; cached text line 11704; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: AECS-MCS operation using EOSS procedures, Colt-Pielstick propulsion diesel troubleshooting and overhaul, Propulsion subsystem and power train calibration, Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00), Motorboat Mechanics and Service Technicians (O*NET 49-3051.00)

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

    [2] O*NET 30.3 occupational data

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

  3. O*NET: Motorboat Mechanics and Service Technicians

    [3] O*NET 30.3 occupational data

    Supports: Motorboat Mechanics and Service Technicians (O*NET 49-3051.00)

Defense contractor jobs for U25A

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

Report an error on this page