The most likely reason for critical damage to the sensor is damage in shipping. The unit must be shipped in an approved box available from the OEM or Regional Avionics Repair LLC.
WARNING!!!
DO NOT SHIP WITHOUT THE APPROVED BOX!
Handle with EXTREME CARE
Avoid damage to sensitive Multisensor
The AHC-85/85E is a precision aircraft sensor, easily damaged by mishandling.
Sensor operation is based on the use of piezoelectric accelerometers. Each sensor
contains four miniature piezoelectric elements mounted on a spinning wheel.
AHC Shipping Container 1 (PDF) Outdated Pricing
AHC Shipping Container 2 (PDF)