- Avionics (492)
- Communication systems (mechanical and electrical systems) (472)
- Testing equipment (304)
- Protective and life-saving equipment (281)
- Tools (245)
- Artificial satellites (120)
- Electrical systems (73)
- Scientific instruments (64)
- Parachutes (life-saving equipment) (47)
- Instructional materials (46)
- Containers (42)
- Breathing devices (29)
- Landing equipment (10)
- Specimens (9)
- Power producing equipment (7)
- Antennas (5)
- Autopilots (5)
- Meteorological instruments (5)
Our collections specialists actively work on the conservation, preservation, restoration, and long-term care of the objects in our collection. From full-scale restoration projects to applying preservation techniques and doing regular assessments, these activities form a crucial part of our stewardship of the National Collection.