text: Appendix D
  FIELD MAINTENANCE
  D-4. Field maintenance consists of two subcategories, operator or crew and Ordnance Corps trained
  maintainer. Field maintenance restores unserviceable equipment, communications systems, or weapon
  systems using line replaceable units or modules and component replacement or repair. The owning unit
  normally performs field maintenance using organic tools and test equipment. The unit should retain and repair
  the item until it is ready to return to service. Field maintenance is not limited to simply remove and replace
  actions. If the operator, crew, or maintainer have the skills, special tools, repair parts, references, and adequate
  time to repair an item, the unit should not evacuate equipment for sustainment maintenance.
  D-5. The brigade support battalion has low-density specialty maintainers to maintain specialized equipment
  in the brigade combat team. These personnel perform maintenance the forward support companies are not
  structured to accomplish including missiles, fire control systems, and signal systems.
  D-6. Field maintenance includes actions performed by crew members, operators, and maintenance
  personnel, such as—
  * Adjustment.
  * Alignment.
  * Service.
  * Applying field-level modification work orders.
  * Fault or failure diagnosis.
  * Battle damage assessment and repair.
  * Recovery.
  D-7. Field maintenance is always repair and return to the user. Maintenance personnel at echelons below
  brigade level reside in the owning unit, forward support company, and field maintenance company.
  Operator and Crew Maintenance
  D-8. Operators and crews perform field maintenance on their assigned equipment as outlined in the
  equipment operator’s manual. The operator or crew is typically the first to observe a fault or failure. In many
  instances, operators or crews can repair the fault or minimize its impact, enabling mission completion.
  Operators and crews may also initiate maintenance tasks in response to fault or failure indicators or
  instrumentation. Typical tasks consist of inspecting, servicing, lubricating, adjusting, and replacing minor
  components or assemblies, as authorized in the maintenance allocation chart. Operator and crew tasks in a
  maintenance allocation chart refer to the applicable technical manual and use basic issue items and onboard
  spares.
  D-9. Operators and crews are specialists on their systems. They receive formal military occupational
  specialty or functional training on diagnosing system faults. Operators and crews troubleshoot their systems
  using the operator’s manual and simplified or embedded diagnostic equipment to identify, isolate, and trace
  problems. Operators and crews include signal or military intelligence military occupational specialties, or a
  maneuver unit’s master gunner, who receive advanced individual training, specialized courses, and in some
  instances, specialized tools. Their primary focus is the system’s performance and integrity. After operators
  and crews exhaust their maintenance capabilities, they rely on maintenance personnel to conduct field
  maintenance on their equipment. Most maneuver units receive this maintenance support from the forward
  support company.
  Maintainer Maintenance
  D-10. Maintainer maintenance is performed by Ordnance School-trained maintenance personnel.
  Maintainers repair a component, accessory, assembly, subassembly, plug-in unit, shop replaceable unit, line
  replaceable unit, or other portion of the equipment, either on the system or after removal by a trained
  maintainer.
  D-11. Depending on the system and military occupational specialty involved, the definition of a line
  replaceable unit or shop replaceable unit is flexible. The characterization of line or shop replaceable units for
  wheeled and tracked vehicles, radar, or communications systems shifts as the field maintenance