0511771-7 – Textron Aviation Door Hinge Pin
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Overview
The Textron Aviation 0511771-7 is a genuine OEM coiled spring pin, a flight-critical component engineered for use in the door hinge assemblies of a vast range of Cessna aircraft. This is not a standard roll pin; it is a specialized, multi-wound spring pin designed to provide a secure, fatigue-resistant pivot and retainer for the door hinges. The 0511771-7 is manufactured from high-strength steel and is designed to be held in place by its own continuous radial spring pressure, creating a durable and vibration-proof hinge point that is essential for the smooth and reliable operation of the aircraft's cabin doors.
As a genuine Textron OEM part, it guarantees the precise dimensions, material strength, and spring characteristics required for this critical airframe application. Its integrity is fundamental to ensuring proper door alignment, latching, and overall safety.
Key Features
Coiled Spring Pin Design: This pin is formed from a sheet of spring steel rolled into a spiral, typically 2.25 times. This multi-coil design provides a more uniform distribution of stress along the pin and in the host material compared to a standard slotted roll pin, significantly increasing its fatigue life.
Positive, Flexible Retention: When installed in a hole, the pin's spring-like construction exerts a continuous and uniform radial force against the wall of the hole. This provides a secure, friction-based retention that is highly resistant to loosening from the constant vibration and shock of door operation.
High-Strength Steel Construction: Fabricated from a high-quality, heat-treated spring steel alloy. This provides the exceptional shear strength required to act as a load-bearing hinge pin while maintaining the flexibility needed for installation and retention.
Corrosion-Resistant Finish: Plated with a durable finish to provide robust protection against corrosion from moisture and other environmental factors, ensuring a long and reliable service life.
Stress Distribution: The coiled design allows the pin to absorb shock and impact loads more effectively than a solid pin, reducing stress on the hinge and the surrounding door and fuselage structure.
Technical Specifications
Part Number: 0511771-7
Component Type: Coiled Spring Pin / Hinge Pin
Material: High-Strength Spring Steel
Finish: Plated for corrosion resistance.
Primary Function: Serves as a pivot and retaining pin for cabin door hinges.
Nominal Diameter: 3/16 inch
Length: Specific to the "-7" dash number, defined by Textron engineering drawings.
Certification: FAA Production Approval
Aircraft Compatibility
The 0511771-7 is a standard hardware component used in the door assemblies of a significant portion of the Cessna piston aircraft fleet. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification.
Common Aircraft Models:
Cessna 100 Series: 152, 172 Skyhawk, 177 Cardinal, 182 Skylane
Cessna 200 Series: 206 Stationair, 210 Centurion
Cessna 300 Series: T303, 337 Skymaster
Applications
The 0511771-7 is a critical component for airframe integrity and safety:
Door Hinge Assembly: The primary pin used to connect the door-side and fuselage-side hinge halves, creating the pivot point for the door.
Airframe Maintenance: A standard replacement item during door rigging, hinge replacement, or major airframe inspections if the original pin shows signs of wear, corrosion, or fatigue.
Why Choose 0511771-7?
The security of an aircraft door in flight is paramount. A worn or failed hinge pin can lead to a loose-fitting door, excessive wind noise, pressurization leaks (on applicable models), or, in a worst-case scenario, a failure of the door structure. Using a genuine Textron Aviation 0511771-7 is the only way to ensure the pin has the certified material strength and specific spring characteristics to provide a secure and durable hinge point as intended by the manufacturer.
The 0511771-7 coiled spring pin offers significant engineering advantages over a simple slotted roll pin in a dynamic application like a door hinge. A slotted pin has a single seam and only provides spring tension opposite that seam, which can concentrate stress on the hole. The 0511771-7's spiral-wound construction means the radial tension is distributed evenly around the entire 360-degree circumference of the hole. This uniform pressure distribution minimizes wear and elongation of the softer aluminum hinge material. Furthermore, as the door pivots, the coiled pin flexes along its entire body, absorbing shear loads and vibrations more effectively and making it far more resistant to fatigue failure. This makes it the superior choice for a joint that experiences thousands of opening, closing, and in-flight vibration cycles.
Note: This is a flight-critical airframe component. Installation must be performed by a certified A&P mechanic in accordance with the current Textron Aviation (Cessna) maintenance manual. Proper tools, such as a pin punch, should be used for installation to avoid damaging the pin or the hinge.