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GM137-1405-7 – Bombardier OEM Left-Hand Aerodynamic Side Seal
Available now on the Airparts.aero Marketplace.
The GM137-1405-7 is a precision-engineered, OEM aerodynamic seal specifically designed for the left-hand (LH) side of the fuselage, engine nacelle, or flight control interface on Bombardier Challenger and Global series aircraft. As a high-performance aerodynamic component, this seal is responsible for maintaining a smooth, laminar airflow over the aircraft’s skin, preventing "parasitic drag" and airframe vibration. The -7 designation identifies this as the specific left-side configuration, ensuring a perfect mirrored fit for the airframe’s contoured geometry.
Constructed from a specialized blend of reinforced silicone or fluorosilicone elastomer, the GM137-1405-7 is built to withstand the extreme thermal gradients and pressure differentials characteristic of high-altitude turbine flight. This seal provides a critical "weather-tight" barrier, preventing moisture, de-icing fluids, and debris from entering the internal airframe gaps, which could otherwise lead to corrosion or freezing of underlying mechanical linkages.
Key Features
Aerodynamic Profile Optimization: Features a custom-molded "P-profile" or "T-section" designed to bridge the gap between moving and stationary airframe components (e.g., cowlings, flaps, or fairings) without creating turbulence.
High-Flexibility Elastomer: Manufactured from aerospace-grade silicone that maintains its Shore Hardness and elasticity in temperatures ranging from –60°C to +200°C.
Chemical & Fluid Resilience: Specifically formulated to resist degradation when exposed to Skydrol (hydraulic fluid), Jet-A fuel, and aggressive runway de-icing chemicals (Type IV).
Reinforced Attachment Spine: Typically features an embedded fabric or metallic carrier (Dacron or Stainless Mesh) to prevent "seal stretch" and ensure the mounting fasteners do not tear through the material at high Mach numbers.
Friction-Reducing Coating: Often treated with a PTFE (Teflon) or dry-film lubricant finish to prevent "chatter" and wear when the seal rubs against adjacent metal surfaces during airframe flexing.
Technical Specifications
Part Number: GM137-1405-7
Manufacturer: Bombardier Aerospace (OEM)
Component Type: LH Aerodynamic Side Seal / Fairing Seal
Material: Reinforced Silicone / Fluorosilicone
Position: Left-Hand (LH) Side
Finish: Natural or Low-Friction Coated
Certification: FAA-PMA / EASA Form 1 (with OEM Traceability)
Governing Specification: Bombardier BAMS (Aerospace Material Specification)
Aircraft Compatibility
Bombardier Challenger Series: 604, 605, 650 (Commonly used on engine pylon-to-fuselage or cowling interfaces).
Bombardier Global Series: 5000, 6000 (Express variants).
Note: The GM137-1405-7 is a "handed" part. Always verify the part number in the Aircraft Illustrated Parts Catalog (IPC) Section 53 (Fuselage) or Section 71 (Powerplant) to ensure it matches the specific station number and side of your airframe.
Specifically for:
- Global 5000
- Global 5500
- Global 6000
- Global 6500
- Global Express
- Global Express Extended Range
- Global Vision G5000
Applications
The GM137-1405-7 is utilized for Airflow Management and Environmental Sealing. Its primary roles include:
Nacelle-to-Pylon Sealing: Preventing high-pressure air from "leaking" into the engine pylon gap, which improves fuel efficiency.
Flight Control Fairings: Providing a smooth transition between the wing and the flap/aileron trailing edges.
Fuselage Access Panels: Creating a pressurized seal for the LH side maintenance or battery bay doors.
Why Choose GM137-1405-7?
Choosing a genuine Bombardier GM137-1405-7 is essential for Vibration and Noise Suppression. Non-OEM "universal" seals often lack the specific compressive recovery required for high-speed flight; an improperly seated seal can "buzz" or vibrate at cruise speeds, causing cockpit noise and premature fatigue of the surrounding aluminum structure. Furthermore, the GM137-1405-7 is UV-stabilized to prevent the "cracking" and "brittleness" that can lead to seal ingestion into the engine intake—a major safety hazard for rear-mounted engines.
The GM137-1405-7 functions through the principle of Compressible Boundary Layer Management. As the aircraft moves through the air, any gap in the fuselage creates a point of high Drag Coefficient ($C_d$). The seal works by providing a physical "bridge" that maintains the Coandă effect, keeping the airflow attached to the airframe surface. The physics of the seal's cross-section (the "Bulb") are designed for a specific Compression Set; even after thousands of hours of being squeezed between panels, the material "springs back" to its original shape. This ensures that the seal remains effective throughout the airframe’s entire pressurization cycle, where the fuselage physically expands and contracts by several millimeters.
Note: This is a flight-critical aerodynamic component. Prior to installation, ensure the mounting surface is completely free of old adhesive, sealant, and corrosion. Use only Bombardier-approved adhesives (e.g., 3M 1300L) or mechanical fasteners as specified in the AMM. Do not "stretch" the seal during installation, as this will lead to thinning and premature failure. Inspect the seal leading edge for "lifting" during every pre-flight walkaround.
