AEL71973 – Continental™ FAA-PMA Magneto Gasket (replaces Lycoming 71973)
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The Continental™ AEL71973 is a premium, FAA-PMA certified gasket engineered as a direct replacement for the Lycoming OEM part number 71973. It is essential for technicians and procurement specialists to correctly identify this component: it is the flight-critical gasket for the magneto mounting pad, not an intake flange gasket. Its specific design and material composition are engineered to create a positive, leak-free seal between the magneto and the engine's accessory drive case, reliably containing the hot, pressurized engine oil that lubricates the ignition system's drive gears.
Manufactured by Continental Aerospace Technologies™, one of the world's leading piston engine OEMs, this part carries the full weight of their engineering and production expertise. As an FAA-PMA approved component, the AEL71973 has undergone a rigorous certification process to demonstrate that its design, materials, and performance are equivalent to or superior than the original Lycoming part, offering the highest level of quality and confidence.
Key Features
FAA-PMA Approved Replacement: Fully certified by the FAA as a safe and direct replacement for Lycoming P/N 71973.
Manufactured by a Premier Engine OEM: Backed by the reputation, engineering, and quality control systems of Continental Aerospace Technologies™.
Prevents Oil Leaks at the Accessory Case: Precision-cut from a durable composite material to reliably contain pressurized engine oil at the magneto flange.
Advanced Oil-Resistant Composite Material: Utilizes a modern, high-grade composite of cellulose fibers and a synthetic rubber binder, specifically formulated to resist degradation from hot engine oil.
Single-Use Design for Maximum Seal Reliability: Engineered to be replaced every time the magneto is installed to ensure a fresh, perfectly conforming sealing surface.
Technical Specifications
Part Number: AEL71973
Component Type: FAA-PMA Magneto Mounting Gasket
Manufacturer: Continental Aerospace Technologies™
Replaces: Lycoming P/N 71973
Material: High-grade, oil-resistant cellulose fiber and synthetic rubber (Nitrile) composite.
Application: Seals the standard two-bolt mounting flange of Bendix or Slick magnetos to the accessory case.
Engine Compatibility
The AEL71973 is FAA-PMA approved for installation on the vast majority of direct-drive Lycoming engines where the Lycoming P/N 71973 is specified. Applicable engine families include, but are not limited to:
O-235, O-320, IO-320, AEIO-320 Series
O-360, IO-360, AEIO-360, TIO-360 Series
O-540, IO-540, AEIO-540, TIO-540, LTIO-540 Series
Crucial Note: The official FAA-PMA supplement for AEL71973 and the specific engine's Illustrated Parts Catalog (IPC) are the final authorities for verifying installation eligibility.
Applications
This gasket is a mandatory replacement part during any maintenance that requires the removal or installation of a magneto.
Complete Engine Overhaul
500-Hour Magneto Inspection and Repair
Magneto Replacement or Timing Adjustments
Why Choose AEL71973?
Choosing the Continental™ AEL71973 provides the ultimate confidence of installing a part made by a world-renowned engine OEM. When a manufacturer like Continental, with over a century of engine design and production experience, produces an FAA-PMA part, it comes with an implicit guarantee of engineering excellence, material science expertise, and manufacturing quality that is second to none. This gasket is a certified, reliable, and cost-effective solution that ensures compliance and safety without compromise.
To gain FAA-PMA approval, the AEL71973 must be manufactured from an engineered composite material that is at least equivalent to the original. This material utilizes a non-asbestos, cellulose fiber matrix to provide structural stability and resistance to extrusion under the clamping pressure of the mounting nuts. This fibrous matrix is then saturated and bonded under heat and pressure with a high-percentage Nitrile (NBR) elastomer. The Nitrile binder provides three critical properties that the fiber alone cannot: 1) Impermeability: It fills the microscopic voids within the fiber matrix, rendering the gasket impervious to the pressurized, low-viscosity engine oil. 2) Conformability: The rubber allows the gasket to flow and conform to any minor surface irregularities on the machined aluminum flanges of the magneto and accessory case, ensuring a complete seal. 3) Resilience: The elastomer gives the gasket the ability to maintain a constant sealing pressure (stress retention) even as the joint experiences minor movements due to the engine's vibration and thermal expansion cycles. This composite approach provides a vastly superior and more durable seal compared to a simple fiber or simple elastomer gasket alone.
Note: This is a single-use component. This gasket MUST be replaced with a new one every time a magneto is installed or reinstalled. Re-using a compressed gasket will result in an oil leak. The magneto and engine mounting surfaces must be perfectly clean, dry, and free of any old gasket material or sealant prior to installation. The magneto mounting nuts should be torqued evenly to the value specified in the engine maintenance manual.
Documentation
The definitive application and installation eligibility for this FAA-PMA component must be confirmed using the official FAA-PMA database and the Illustrated Parts Catalog (IPC) and maintenance manuals for the specific engine model.