The 487-495 is a Piper OEM main landing gear downlock spring used in the landing gear locking mechanism to ensure the gear remains securely locked in the down-and-locked position during flight and ground operations.

In Piper aircraft landing gear systems, the downlock spring provides the necessary tension and mechanical force to assist or maintain engagement of the locking mechanism, helping prevent unintended gear retraction or partial locking. It works as part of the gear actuator and over-center locking system, ensuring positive mechanical retention when the landing gear is extended.

The spring is typically installed within the landing gear mechanism where it applies constant force to maintain engagement of the lock components. This contributes to system safety by ensuring that aerodynamic loads and vibration do not overcome the locking geometry.

Manufactured to Piper OEM specifications, the 487-495 is made from high-strength spring steel or corrosion-resistant alloy steel, designed to maintain consistent elasticity and fatigue resistance under repeated landing cycles, vibration, and environmental exposure.

Because it is part of a critical safety system (landing gear locking mechanism), maintaining correct spring tension and condition is essential. Loss of elasticity, deformation, or corrosion can compromise gear locking reliability and must be addressed during maintenance inspections.

Key features include:

Piper 487-495 main landing gear downlock spring (OEM component)
Ensures secure landing gear down-and-locked position
Supports mechanical locking system engagement
Helps prevent unintended gear retraction
Material: high-strength spring steel or corrosion-resistant alloy
Designed for repeated cyclic loading and fatigue resistance
Maintains consistent elastic force over service life
Installed in landing gear locking mechanism assembly
Critical safety component for landing gear operation
Direct replacement part per Piper IPC specifications