Lycoming

Aviation Part MES-98S

P/N MES-98S

Condition disclosed

Condition as listed — Condition disclosed — is shown up front on this listing, along with the exact price, current availability, and what certification paperwork ships with the part, so you can confirm fit and airworthiness before you buy. Full specifications and answers to common questions are below.

Stocked & sold by AAP

Request a quote for pricing

On backorder

UOM EA · MOQ 1

Paperwork shown up front · 30-day returns · secure checkout

Request certification documents (8130-3 / EASA Form 1 / C of C)

Description

The Lycoming MES-98S engine stud is a precision-engineered threaded fastener integral to the structural integrity and reliable operation of the Lycoming IO-720 series aircraft engine. This specialized stud plays a crucial role in securing specific components within the engine assembly, ensuring that critical loads are properly distributed and maintained during all phases of engine operation. Its precise dimensions and material composition are vital for resisting the dynamic stresses, vibrations, and thermal cycles inherent in high-performance piston engines, thereby contributing directly to the safety and longevity of the powerplant.

Overview

This Lycoming MES-98S component functions as a critical fastening element within the Lycoming IO-720 engine family. As an engine stud, it is designed to provide a robust and secure connection point for various accessories, covers, or internal structural elements, preventing movement or separation under severe operating conditions. The integrity of each MES-98S stud is paramount to maintaining the engine's designed performance characteristics and preventing potential failures that could compromise flight safety. Its specific location and application within the engine are detailed in the official Lycoming IO-720 Parts Catalog PC-119 and associated Service Instructions.

Specifications

While specific detailed specifications for the MES-98S are proprietary to Lycoming and found within their engineering documents, typical characteristics for such a critical engine fastener include:

AI disclosure: this product description and its specifications were generated with AI assistance from the manufacturer's Illustrated Parts Catalog.

Specifications

Part number	MES-98S
Manufacturer	Lycoming
Condition	—
Airworthiness	Condition disclosed
Country of origin	—
Lead time	days

Frequently asked

Does the Aviation Part MES-98S include certification paperwork?

This item is supplied as "Condition disclosed" rather than with full 8130-3 traceability — normal for some condition codes, and it does not mean the part is unusable, only that the paperwork profile differs. Check the listing for exactly what documentation is included, and request any available records before you purchase if your installation requires them.

What condition is this part?

This part is listed in condition as listed — Condition disclosed. Condition codes describe how a part reached its current state (for example new, overhauled, serviceable, repaired, or as-removed) and directly affect what paperwork ships with it and how it should be installed. See the Glossary for the full definition of every condition code we use.

How fast does it ship?

This item is currently on backorder, meaning demand has temporarily outpaced our stock and a new shipment is inbound from the manufacturer or our supplier. Request a quote and we will confirm the current estimated delivery window before you commit. If your aircraft is grounded, AOG expedited handling is available on request.

Can I return it?

You may return this item within 30 days of delivery if it is unopened, uninstalled, and in its original packaging. Items that have been installed, powered on, opened hazmat, or separated from an attached 8130-3 tag are non-returnable because their airworthiness status can no longer be confirmed once removed from the part. See our Returns policy for the full process.