Lycoming

Aviation Part LW-13429

P/N LW-13429

NE — New Condition disclosed

Condition NE — 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.

Sold by AAP

What does “New” condition mean?

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

Overview

The Lycoming Cylinder Base Nut (P/N LW-13429) is a vital threaded fastener specifically engineered to secure the cylinder assembly to the crankcase studs on various Lycoming engines, most notably the TIGO-541 series. This robust nut plays a critical role in maintaining the structural integrity of the power section, ensuring proper compression sealing between the cylinder and crankcase, and effectively transmitting combustion forces. Its precise design is paramount for the reliable operation of the engine, preventing cylinder movement and maintaining the specified torque pre-load for the entire cylinder assembly.

Specifications

Part Number: LW-13429
Type: Cylinder Base Nut / Hold-Down Nut
Material: High-strength alloy steel, typically heat-treated for durability.
Finish: Cadmium plated for superior corrosion resistance and reduced thread galling.
Thread Type: Precision-machined internal threads, commonly a fine-pitch UNF (Unified National Fine) series, designed for high clamping force and vibration resistance.
Hex Size: Standard hex head for wrenching, typically 1/2 inch or 9/16 inch across flats, ensuring compatibility with common aviation tooling.
AI disclosure: this product description and its specifications were generated with AI assistance from the manufacturer's Illustrated Parts Catalog.

Specifications

Part number	LW-13429
Manufacturer	Lycoming
Condition	NE
Airworthiness	Condition disclosed
Country of origin	—
Lead time	days

Frequently asked

Does the Aviation Part LW-13429 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 NE — 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.