The GL14 bearing used in the Standard Cirrus glider is a small precision control-system bearing (typically ball or plain spherical bearing depending on installation point) designed for use in airbrake and flight control linkage assemblies.

It is specified under MIL-PRF-23827 lubrication standard, which defines the required performance characteristics of aircraft and instrument greases used in bearings and control mechanisms rather than the bearing geometry itself.

In this context, “GL14” refers to a designated bearing location/type in the Cirrus maintenance documentation, where the bearing must be:

lubricated with MIL-PRF-23827 qualified grease
capable of low-friction oscillating motion
compliant with aircraft control-system safety requirements
Key features:

Precision aerospace control-system bearing (GL14 position)
Used in airbrake / control linkage assemblies (Standard Cirrus sailplane)
Lubricated with MIL-PRF-23827 aircraft instrument grease
Designed for low-speed oscillating motion (not high-RPM rotation)
Corrosion-resistant steel construction
Tight tolerance to minimize play in control surfaces
Maintains smooth actuation of airbrakes and linkage systems
Replacement typically done at scheduled sailplane maintenance intervals
Safety-critical flight control component
Installed in fuselage or wing-root control linkage points depending on variant