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:
- Stock: Out of Stock - On Backorder
- Manufacturer Part #: MES-98S
- Part#: MES-98S
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Returns & refund summary
- 30-day return window — with prior return authorization, unopened in original packaging.
- Restocking fee: 20% on unopened items, 30% on open-box items.
- Refund processing fee: 5.51% applies to all refunds (returns, cancellations, core-fee refunds) regardless of reason.
- Return shipping: paid by buyer.
- Non-returnable categories: installed/used parts, special-order or rebuilt items, programmed items (incl. ELTs), batteries, AOG-priority orders, international orders.
Full terms: Return Policy.
Authenticity & authorization
All parts sold by American Aviation Parts are genuine factory products sourced through authorized distribution channels. Our authorization status varies by brand — for some brands we are a direct authorized dealer; for others we are an independent reseller through authorized distribution. Either way, the part you receive is the same factory product, with standard documentation available on request.
See our full Manufacturer Authorizations page for the current per-brand status.
Need traceability paperwork?
If your installation requires FAA Form 8130-3, manufacturer Certificate of Conformance, or other traceability documentation, please call 1-877-722-8727 or email [email protected] before placing the order so we can confirm what is available for this part.
Shipping
Standard ground, expedited, and AOG shipping options are available at checkout. Full shipping-cost tiers and timelines are published on our Delivery Information page.
