Ow can 4D computer aided goggles can used and help for aircraft engine maintenance tasks

NO need of introduction.
i?? 3D computer aided goggles simulation (explain)
i?? What kind of 3D simulation use in aircraft industry at the present time
i?? What kind sensors can use to monitor aircraft engine noise, temperature and pressure ( normal and if there is some thing wrong)
i?? How can 4D computer aided goggles( smell and noise) can used and help for aircraft engine MAINTENANCE tasks ( at least 10 pages)
i?? Recommendation for 4D computer aided goggles