The AIRS Instrument Support Structure (ISS) holds the various subsystems together, as well as providing alignment, thermal isolation and conduction, vibration isolation, and electrical ground.
- provides a 7-point interface to the spacecraft
- This includes a 3-point kinematic mount to the platform
- The ISS baseplate is aluminum, while the support trusses are beryllium, aluminum and titanium.
- The scan head support system, made from beryllium, consists of a three-point interface to the base ring of the instrument support truss.
- maintains instrument alignment stability and boresight relative to the spacecraft
- maintains the alignment after exposure to the environmental loads and gravity release.
- maintains alignment after the instrument achieves operational temperature
- thermally isolates the three thermal zones of 155 K, 190 K and 290 K
- provides high thermal conductivity between the Aqua spacecraft’s Heat Rejection System (HRS) and the electronics
- provides vibration isolation between the cryocoolers and the spectrometer
- serves as electrical ground and electrical isolation for sensitive electronic subsystems.