The MS 961-150-150-L3 rotule is an aviation-grade ball joint (rod end / spherical bearing assembly) used in the Standard Cirrus glider control linkage system, typically in the air brake / control system mechanical connections.

This specific part designation appears in the maintenance and service documentation for Standard Cirrus sailplanes, where it is listed as a mandatory replacement item after defined operating hours due to wear limits in the control system joints.

Key features include:

MS-series aviation standard ball joint (rotule)
Used in control linkage / air brake drive lever system
High-precision spherical articulation for low-friction movement
Designed for cyclic load and vibration in sailplane operations
Corrosion-resistant steel construction
Maintenance-critical component (scheduled replacement item)
Part of certified glider airworthiness maintenance system
Ensures precise control surface actuation without play
Typically installed in fuselage-mounted mechanical linkages
Must be replaced according to flight-hour maintenance intervals