Accreditation: Where ADEs are engaged in work requiring accreditation, they will either have that accreditation in place, or will obtain the accreditation as a pre-requisite of accepting a contract.

Quality standards: All ADEs have quality control mechanisms in place to ensure their products and services meet the required standard. Many ADEs maintain ISO 9001 accreditation.

Machinery and equipment: ADEs have a wide range of plant and equipment from heavy vehicles, trucks, trailers, ground maintenance equipment, forklifts, welding and other workshop plant. When an ADE applies for a contract, the equipment required will already be available, or the finance will be available for its purchase.