?unique=8ef55ec)
GM137-1405-12 – Bombardier OEM Right-Hand Aerodynamic Side Seal
Available now on the Airparts.aero Marketplace.
The GM137-1405-12 is a precision-engineered, high-performance aerodynamic seal designed specifically for the right-hand (RH) side of the fuselage or pylon interface on Bombardier Challenger and Global series aircraft. As a specialized variant in the GM137-1405 series, the "-12" seal is a critical component for maintaining symmetrical laminar flow at the aircraft's rear stations. By bridging the mechanical gaps between structural panels and the engine pylon or nacelle fairings, this seal eliminates "parasitic drag" and provides a robust environmental barrier against moisture, debris, and de-icing fluids.
Constructed from a high-durability reinforced fluorosilicone elastomer, the GM137-1405-12 is built to withstand the intense vibration and extreme thermal gradients of long-range turbine flight. It maintains its structural integrity and "spring-back" force from the cryogenic cold of high-altitude cruise (–55°C) to the high "soak-back" temperatures experienced at the engine-to-pylon interface during ground operations.
Key Features
Precision RH Contoured Profile: Specifically molded to match the unique curvature of the right-side airframe geometry, ensuring a flush, "zero-step" aerodynamic transition between panels.
Reinforced Matrix Construction: Features an internal fabric or mesh "scrim" (typically polyester or fiberglass) that provides the tensile strength required to resist "peeling" or "lifting" at high Mach numbers.
Skydrol and Fuel Resilience: Specially formulated to resist swelling, softening, or chemical degradation when exposed to Phosphate Ester hydraulic fluids (Skydrol LD-4/5) or Jet-A1 fuel.
Compression Set Resistance: The high-quality silicone core is designed to maintain its seal integrity after thousands of pressurization cycles, accommodating the natural "breathing" of the airframe skin.
UV and Ozone Shielding: Chemically stabilized to prevent the "chalking" and "embrittlement" caused by intense solar radiation at high altitudes.
Technical Specifications
Part Number: GM137-1405-12
Manufacturer: Bombardier Aerospace (OEM)
Component Type: RH Aerodynamic Side Seal / Pylon Fairing Seal
Material: Reinforced Fluorosilicone / Silicone
Position: Right-Hand (RH) 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 -12 seal is a position-specific "handed" part. Always verify your aircraft’s station number and mod status in the Illustrated Parts Catalog (IPC) Section 53 (Fuselage) or Section 71 (Powerplant) to confirm this matches your RH assembly.
Applications
The GM137-1405-12 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 aerodynamic efficiency.
Corrosion Inhibition: Acting as a moisture barrier to prevent water and de-icing fluids from reaching the aluminum substructure.
Why Choose GM137-1405-12?
Choosing the genuine Bombardier GM137-1405-12 is essential for Fuel Efficiency and Noise Suppression. An improperly fitted or non-OEM seal can cause "flow separation," leading to an increased Drag Coefficient ($C_d$) and higher fuel burn. Furthermore, the GM137-1405-12 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 GM137-1405-12 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.
