Most of the Trimmable Horizontal Stabilizer Actuators (THSA) feature a dual structural load path, the primary load path being loaded, the secondary load path being normally unloaded, or both load paths sharing in parallel the Horizontal Stabilizer load. This document describes existing methods for detecting rupture or disconnection of loaded load paths as an overview for those specifying or designing Horizontal Stabilizer Trim Actuators in order to compare existing solutions as reference for implementation in new aircraft programs.
Rationale: This document is being updated in response to a five-year review.
The new scope has been balloted by the panel committee in Fall 21 as follows:
This Aerospace Information Report (AIR) supplies information on Trimmable Horizontal Stabilizer Actuator structural load path integrity. It describes the different methods for detecting rupture or disconnection of load paths. Moreover, it describes the monitoring principle in order to compare existing solutions as reference for implementation in new aircraft programs.
