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GM137-1405-9 – Bombardier OEM Left-Hand Aerodynamic Side Seal
Available now on the Airparts.aero Marketplace.
The GM137-1405-9 is a flight-critical, precision-engineered aerodynamic seal designed specifically for the left-hand (LH) side of the fuselage or pylon interface on Bombardier Challenger and Global series aircraft. As part of the GM137 series, this "-9" variant is an essential aerodynamic fairing component responsible for maintaining a clean, laminar flow transition between structural airframe panels. By bridging the gap between the engine pylon, nacelle, or fuselage skin, this seal eliminates "parasitic drag" and prevents the ingress of moisture and debris into sensitive internal cavities.
Constructed from a specialized reinforced fluorosilicone elastomer, the GM137-1405-9 is engineered to survive the high-vibration and extreme thermal environment of a turbine engine pylon. It maintains its mechanical properties from the cryogenic temperatures of high-altitude cruise (–55°C) to the high "soak-back" temperatures experienced during ground operations.
Key Features
Precision LH Contoured Profile: Specially molded to match the specific curvature of the left-side airframe stations, ensuring a "zero-step" aerodynamic transition.
Reinforced Matrix Core: Features an internal fabric or mesh "scrim" (typically polyester or fiberglass) that provides the tensile strength required to resist "lifting" or "peeling" at high Mach numbers.
Skydrol and Fuel Resilience: Specifically formulated to resist swelling, softening, or degradation when exposed to Phosphate Ester hydraulic fluids (Skydrol LD-4) or Jet-A1 fuel.
Compression Set Resistance: The high-quality silicone core is designed to "spring back" after thousands of pressurization cycles, ensuring a tight seal as the airframe expands and contracts.
UV and Ozone Shielding: Chemically stabilized to prevent the "chalking" and "embrittlement" caused by intense solar radiation at high altitudes.
Technical Specifications
Part Number: GM137-1405-9
Manufacturer: Bombardier Aerospace (OEM)
Component Type: LH Aerodynamic Side Seal / Pylon Fairing Seal
Material: Reinforced Fluorosilicone / Silicone
Position: Left-Hand (LH) Side
Finish: Smooth, Low-Friction Coated
Certification: FAA-PMA / EASA Form 1 (with OEM Traceability)
Standard: Compliant with Bombardier BAMS material specifications.
Aircraft Compatibility
Bombardier Challenger Series: 604, 605, 650.
Bombardier Global Series: 5000, 6000 (Express/XRS).
Note: The -9 seal is a position-specific "handed" part. Always verify your aircraft’s station number in the Illustrated Parts Catalog (IPC) Section 53 (Fuselage) or Section 71 (Powerplant) to confirm this matches your LH pylon or fairing assembly.
Specifically for:
- Global 5000
- Global 5500
- Global 6000
- Global 6500
- Global Express
- Global Express Extended Range
- Global Vision G5000
Applications
The GM137-1405-9 is utilized for Boundary Layer Control and Environmental Protection. Its primary roles include:
Pylon-to-Fuselage Sealing: Minimizing turbulence at the high-stress junction where the engine pylon meets the rear fuselage.
Nacelle Fairing Seal: Providing a smooth bridge between engine cowlings and fixed pylons to optimize engine cooling and drag profiles.
Corrosion Inhibition: Acting as a moisture barrier to prevent water, salt, and de-icing fluids from reaching the aluminum substructure.
Why Choose GM137-1405-9?
Choosing the genuine Bombardier GM137-1405-9 is essential for Fuel Efficiency and Noise Suppression. An improperly fitted or non-OEM seal can cause "flow separation," leading to increased Drag Coefficient ($C_d$) and higher fuel burn. Furthermore, the GM137-1405-9 is designed with a specific Durometer (Hardness) that provides the ideal balance between a watertight seal and enough flexibility to accommodate airframe flex during high-G maneuvers or turbulence.
The GM137-1405-9 functions on the principle of Laminar Flow Continuity. At cruise speeds, any gap or step in the airframe creates a Turbulent Wake. This seal ensures the Reynolds Number ($Re$) remains within the laminar profile across panel transitions. The physics of the seal’s Compression Set are vital; it must retain its "spring-back" force throughout the fuselage's expansion/contraction cycles ($P_{cabin}$ vs $P_{ambient}$). This is achieved via the reinforced silicone matrix, which provides the modulus of elasticity required to maintain a seal even as the airframe skin "breathes" during flight.
Note: This is a flight-critical aerodynamic component. Prior to installation, the mounting area must be "surgical-clean," free of old sealant and oils. Use only the specific Bombardier-approved bonding agent (e.g., 3M 1300L) or hardware. Do not over-compress the seal during installation. Inspect for "lifting" or "fraying" during every pre-flight walkaround, as a loose seal can be ingested into the engine intake.
