MC0523921 – McFarlane FAA-PMA Wide Flap Roller Bearing
Available now on the Airparts.aero Marketplace.
Overview
The McFarlane MC0523921 is an FAA-PMA approved, wide flap roller bearing, engineered as a superior, direct replacement for the original Cessna OEM part number S2398-1. This flight-critical component is designed to guide the wing flap assembly as it moves along the flap tracks during extension and retraction. McFarlane has redesigned this roller using an advanced, wear-resistant polymer to address the common issues of wear, swelling, and binding found with original components. This results in smoother, more reliable flap operation and a significantly longer service life.
Key Features
- Advanced Polymer Material: Fabricated from a vastly improved, proprietary polymer that is not susceptible to moisture absorption. This eliminates the risk of the roller swelling and binding in the track, a common problem in humid environments.
- Superior Wear Resistance: The specialized material offers significantly higher resistance to wear and the development of "flat spots" compared to the original nylon rollers, ensuring a smooth rolling action for thousands of cycles.
- Low-Friction Performance: The inherent lubricity of the polymer material ensures the flaps travel with minimal effort, reducing strain on the flap actuator motor, cables, and drive train.
- Precision Machining: CNC machined to exacting tolerances, guaranteeing a perfect fit on the axle and within the flap track, which is essential for preventing flap "slop" and ensuring symmetrical deployment.
- Direct PMA Replacement: A certified FAA-PMA direct replacement for Cessna P/N S2398-1, guaranteeing perfect form, fit, and function, providing an airworthy and often superior alternative to the original part.
Technical Specifications
- Part Number: MC0523921
- Manufacturer: McFarlane Aviation Technologies
- Component Type: Wide Flap Track Roller Bearing
- Material: High-Strength, Low-Friction, Moisture-Resistant Polymer
- OEM Replacement for: Cessna P/N S2398-1
- Dimensions:
- Outside Diameter: 0.875 inches
- Width: 0.500 inches
- Axle/Bolt Size: 1/4 inch
- Certification: FAA-PMA
Aircraft Compatibility
The McFarlane MC0523921 is FAA-PMA approved for installation on a wide range of high-performance Cessna single-engine aircraft that specify the S2398-1 roller. It is imperative to consult the McFarlane eligibility chart or the specific aircraft's Illustrated Parts Catalog (IPC) for final verification.
- Compatible Aircraft Models (Examples):
- Cessna 172 Skyhawk (later models)
- Cessna 182 Skylane (later models)
- Cessna 206 Stationair / Turbo Stationair
- Cessna 210 Centurion / Turbo Centurion
Applications
The MC0523921 is the premier solution for maintaining and upgrading the flap system:
- Flap System Overhaul: The ideal choice when replacing all rollers during a flap system overhaul to ensure longevity and smooth operation.
- Repair of Sticking or Binding Flaps: Directly addresses the common cause of flap binding related to swollen or worn original rollers.
- Performance & Safety Upgrade: An excellent upgrade for any eligible aircraft, providing a more reliable and durable component in a flight-critical system.
Why Choose MC0523921?
Smooth, reliable, and symmetrical flap operation is critical for safe flight, especially during approach and landing. The McFarlane MC0523921 roller directly targets and solves the known failure modes of the original component. By using a superior, moisture-proof polymer, McFarlane has engineered a roller that will not bind in the track, providing a smoother feel and enhanced reliability. For a flight-critical component, choosing a McFarlane PMA part not only provides a cost-effective solution but also a measurable engineering improvement.
Order Your McFarlane MC0523921 Flap Rollers Now
Upgrade the reliability and performance of your aircraft's flap system with a superior PMA part from McFarlane. Visit Airparts.aero to order your MC0523921 wide flap rollers today.
The McFarlane MC0523921 flap roller is a key element in the Fowler flap systems common on many Cessna aircraft. As the flaps extend, they not only pivot downward but also travel aft along a curved track, increasing the wing's surface area and camber. The rollers guide this complex movement. The advanced polymer used in the MC0523921 has a lower coefficient of friction and higher dimensional stability than the nylon used in the original parts. This means that even under the high loads experienced during flap deployment in flight, the roller maintains its shape and smooth surface, preventing the "skidding" and "binding" that can cause asymmetric flap deployment or over-stress the flap actuator system.
Note: This is a flight-critical component. Installation must be performed by a certified A&P mechanic in accordance with the current Textron Cessna maintenance manual. It is highly recommended to replace all rollers on a flap carriage simultaneously to ensure even wear and smooth operation.
