AIRS Mechanical Subsystem

The AIRS Instrument Support Structure (ISS) is designed to maintain instrument alignment stability and boresight relative to the spacecraft. It provides a 7 point interface to the spacecraft including a 3 point kinematic mount to the platform and maintains the alignment after exposure to the environmental loads ang gravity release. 

Alignment is maintained evan after the instrument achieves operational temperature and provides thermal isolation between the three thermal zones of 155K, 190K and 290K. It provides high thermal conductivity between the HRS (Heat Rejection System) and the electronics. The ISS provides vibration isolation between the cryocoolers and the spectrometer. 

Finally the ISS serves as electrical ground and insulation for sensitive electronic subsystems. The ISS baseplate is made of aluminum, while the support Trusses are made of beryllium, aluminum and titanium.