| Verified object | Different kind of product | Complex operating equipment, narrow operating space equipment, large-scale equipment | All kinds of ORU esp. Complex operation, small operating space based on simulated cabin environment | Maintenance operation and procedure for all kinds of ORU in cabin environment |
| Verified items | Visibility and attainability | Maintenance operation, maintenance tool, scope of impact | Maintenance procedure, maintenance operating, time consumption, scope of impact, certain part supporting | Maintenance procedure, operating design and space, tool, time; default identification, power supply and information separation design, maintenance working mode, scope of impact. |
| Verified method | Computer picture simulation | Computer picture simulation + on ground testing (1-g simulation, hanging maneuver etc.) | 1-g simulation, hanging maneuver, VR | Hanging maneuver, neutral buoyancy tank, VR |
| Product illustration | Preventive maintenance ORU, fluid loop equipment, external cabin ORU | Greater impact scope, passably meet visual and attainable requirement, specialized tools | Cover the verified object in 1st step and 2nd step. Can make adjustment with reference to the current layout. | To cover ORU as more as possible |