new high-accuracy inertial navigation system will be phased in
to augment the present KT-70 inertial measurement units in 1988-89.
These new IMUs will result in lower program costs over the next
decade, ongoing production support, improved performance, lower
failure rates and reduced size and weight. The HAINS IMUs also
contain an internal dedicated microprocessor with memory for processing
and storing compensation and scale factor data from the vendor's
calibration, thereby reducing the need for extensive initial load
data for the orbiter's computers. The HAINS is both physically
and functionally interchangeable with the KT-70 IMU.