S4628-1487 – Textron Aviation OEM Wide Wing Flap Bearing Roller Assembly
Available now on the Airparts.aero Marketplace.
Overview
The Textron Aviation S4628-1487 is a genuine OEM, wide-profile wing flap roller, a flight-critical component engineered for the high-performance flap systems of the Cessna Citation 560XL series of business jets. This is not a standard polymer roller; it is a precision-machined bearing assembly designed to withstand the immense aerodynamic loads and high cycle counts associated with jet aircraft operations. The S4628-1487 guides the massive Fowler flaps along their tracks during extension and retraction, ensuring smooth, symmetrical, and binding-free movement. As a genuine Textron OEM part, it guarantees the advanced material properties and exacting tolerances required for the safety and reliability of a transport-category aircraft's flight control system.
Key Features
- High-Performance Polymer Construction: Fabricated from an advanced, high-strength, self-lubricating polymer (such as Torlon® or equivalent). This material is selected for its exceptional compressive strength, low coefficient of friction, and superior wear resistance under high loads and at a wide range of operating temperatures.
- Wide Profile for Load Distribution: The "wide" design provides a broad contact surface within the flap track. This is critical for distributing the high aerodynamic loads evenly, preventing excessive stress on any single point of the track or roller, and minimizing wear.
- Precision Machined for Smooth Travel: Each roller is CNC machined to extremely tight dimensional tolerances for diameter, width, and concentricity. This precision is essential to prevent jamming and to ensure the flaps on both wings deploy and retract symmetrically.
- Maintains Flap System Rigging: The integrity and consistent diameter of these rollers are fundamental to maintaining the proper rigging of the complex flap system. Worn rollers can introduce "slop," leading to flap asymmetry and undesirable flight characteristics.
- Genuine Textron OEM Part: As a genuine factory component, it guarantees conformance to the material, manufacturing, and quality control standards specified in the Type Certificate for the Citation 560XL, Excel, and XLS.
Technical Specifications
- Part Number: S4628-1487
- Component Type: Wide Wing Flap Track Roller Bearing
- Material: High-Strength, Self-Lubricating Polymer (e.g., Torlon® or equivalent)
- Primary Application: Guides the main wing flap carriages within the flap tracks.
- Certification: FAA Production Approval
Aircraft Compatibility
The S4628-1487 is the specific OEM flap roller for the highly successful Cessna Citation 560XL family of mid-size business jets. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for applicability and correct positioning.
- Primary Aircraft Models:
- Cessna Citation 560XL
- Cessna Citation Excel
- Cessna Citation XLS & XLS+
Applications
The S4628-1487 is a flight-critical component essential for the safety and performance of the aircraft's high-lift system:
- Flap Actuation: Ensures the smooth and reliable movement of the wing flaps throughout their entire range of travel.
- Scheduled Maintenance: A mandatory inspection item during detailed phase inspections. Rollers are checked for cracking, delamination, flat-spotting, and diametrical wear.
- Flight Control System Overhaul: Replaced as a set during major overhauls of the flap actuation system to restore it to zero-time tolerances.
Why Choose S4628-1487?
The failure of a flap roller on a business jet can have severe consequences, including a jammed or asymmetric flap condition, which is a serious in-flight emergency. The aerodynamic and inertial loads on the flap system of a 20,000 lb jet are orders of magnitude greater than those on a piston single. Using a genuine Textron Aviation S4628-1487 is the only way to ensure the part is made from the specified advanced polymer capable of handling these loads. For a flight-critical component on a transport-category aircraft, there is absolutely no substitute for a fully traceable, certified OEM part.
Order Your S4628-1487 Flap Rollers Now
Ensure the integrity and reliability of your aircraft's flight control systems with genuine Textron Aviation OEM components. Visit Airparts.aero to order your S4628-1487 wide flap rollers today.
The S4628-1487 roller is a key component in the complex Fowler flap system used on the Citation 560XL. This system extends the flaps aft on carriages before pivoting them down, significantly increasing both wing area and camber to generate high lift for low-speed flight. The rollers bear the entire load of this massive flap surface as it moves through the air. The use of a high-performance polymer like Torlon® is an engineering necessity, as its high compressive strength prevents the roller from deforming under load, while its low coefficient of friction allows it to roll smoothly without requiring external lubrication, which would attract dirt and debris in the exposed flap track environment.
Note: This is a flight-critical component. Installation must be performed by a certified A&P mechanic with experience on Citation aircraft, in strict accordance with the current Textron Aviation maintenance manual. It is highly recommended to replace all rollers on a flap carriage simultaneously to ensure even load distribution and wear characteristics.
