The 14H29884 is an oil-regulating piston ring of expander type and is specified for pistons with a 5.125-inch bore. Lycoming parts catalogs identify 14H29884 as the piston oil ring for multiple engine models, including applicable IO-360 and O-540 series engines.

Product Information:

Manufacturer: Lycoming / Textron Lycoming
Part Number: 14H29884
Component: Ring Assembly – Piston
Description: Piston Oil Regulating Ring
Type: Expander Type
Bore: 5.125 in
System: Piston / Engine
Application: Applicable Lycoming piston engines
Supersedes: 14H21950
Replaces: 73857
Condition: New
Unit of Measure: Each
Weight: 0.032 kg (0.07 lb) estimated shipping weight
The 14H29884 is the current replacement for 14H21950; Aircraft Spruce specifically confirms that 14H21950 has been superseded by 14H29884.

Lycoming's current parts documentation identifies 14H29884 as the piston oil regulating ring and lists it in piston and ring assemblies for applicable engines.

Application & Compatibility:
Before installation, verify 14H29884 against the applicable Lycoming Illustrated Parts Catalog, engine model, piston configuration, and current approved maintenance documentation. Confirm supersession and interchangeability requirements for the specific engine application.

Maintenance & Installation:
Installation should be performed by appropriately qualified aircraft maintenance personnel in accordance with the applicable Lycoming maintenance documentation and approved procedures. Proper piston ring inspection, orientation, installation, and measurement should be completed as specified by the applicable engine maintenance instructions.