?unique=71019e9)
LGPL9SC-V06B04AC – Bombardier OEM Pull-Type Fastener
Available now on the Airparts.aero Marketplace.
The Bombardier LGPL9SC-V06B04AC is a high-performance, flight-critical pull-type interference-fit fastener, specifically engineered for primary structural applications in Bombardier airframes. As a member of the "LGP" (Lightweight GP) Lockbolt family, this fastener is designed to provide the permanent, high-clamping force of a solid rivet with the consistency and ease of installation associated with a threaded bolt. The LGPL9SC series features a shear-head configuration with a pull-type mandrel, allowing for high-rate installation in sections of the fuselage, wing spar, or floor beams where precision and weight savings are paramount.
The complex alphanumeric code for this fastener denotes a specific material and dimensional profile tailored for Bombardier’s manufacturing standards. The "V06" indicates a 3/16-inch (0.1875 in.) nominal shank diameter, while the "B04" specifies a grip length optimized for a 1/4-inch material stack. The "AC" suffix typically signifies a specialized chemical conversion coating or lubricant designed to prevent fretting and galvanic corrosion when installed in aluminum or composite structures. This fastener is an OEM requirement for maintaining the structural integrity of transport-category aircraft.
Key Features
High-Strength Titanium or Alloy Steel: Depending on the specific Bombardier material callout, these fasteners utilize high-tensile alloys (such as Ti-6Al-4V) to provide a superior strength-to-weight ratio compared to standard steel fasteners.
Controlled Interference Fit: Designed to expand slightly upon installation, filling the fastener hole completely to provide an "interference fit" that optimizes load transfer and enhances the fatigue life of the joint.
Positive Mechanical Lock: Utilizing a swaged collar (sold separately), the fastener creates a vibration-proof, permanent mechanical lock that cannot be loosened like a traditional nut and bolt.
Shear-Head Design: Features a low-profile head geometry that reduces weight and provides a clean aerodynamic finish, essential for external skin applications.
Integrated Mandrel Break-Off: Engineered for a clean, consistent break at the "pintail," ensuring the fastener is properly tensioned without the need for manual torque checks.
Technical Specifications
Part Number: LGPL9SC-V06B04AC
Manufacturer: Bombardier Aerospace (OEM) / Howmet Fastening Systems (Licensed)
Fastener Type: LGP Pull-Type Lockbolt (Stump or Pull variant)
Diameter: 3/16 inch (0.1875 in.) / -V06
Grip Length: 0.250 inch (4/16 in.) / -B04
Head Style: Shear Head (Low Profile)
Material: Typically Titanium Alloy (Ti-6Al-4V) or 8740 Alloy Steel (Verify per BAMS spec)
Finish: "AC" (Aluminum pigmented coating or Hi-Kote™ for corrosion/lubrication)
Governing Specification: BAMS 521-002 (Bombardier Aerospace Material Specification)
Aircraft Compatibility
Bombardier Global Series: Global Express, 5000, 6000, 7500, 8000.
Bombardier Challenger Series: 300, 350, 604, 605, 650.
Bombardier CRJ Series: 700, 900, 1000 NextGen airframes.
Note: Fastener effectivity must be cross-referenced with the specific Illustrated Parts Catalog (IPC) and Structural Repair Manual (SRM) for your aircraft's tail number.
Applications
The LGPL9SC-V06B04AC is utilized for Primary Structural Joint Integrity. Its specific roles include:
Wing-to-Fuselage Attachments: Providing high-shear resistance in heavy-load transfer areas.
Floor Beam Integration: Securing primary cabin floor structures to the fuselage frames.
Skin-to-Frame Fastening: Used in pressurized sections of the fuselage where a leak-proof, vibration-resistant permanent fastener is required.
Why Choose LGPL9SC-V06B04AC?
Using the exact Bombardier OEM LGPL9SC-V06B04AC is critical for maintaining the damage tolerance of the aircraft. Standard commercial lockbolts do not meet the strict "interference fit" requirements of the LGP system. An incorrect fastener can result in "hole slop," leading to localized stress concentrations and premature fatigue cracking of the airframe skin. The "AC" coating is vital for preventing galvanic corrosion in the interface between the fastener and the aluminum structure, particularly in areas exposed to environmental moisture.
The LGPL9SC-V06B04AC operates on the principle of radial expansion and axial tension. During the installation cycle, a specialized hydraulic pull tool grips the pintail of the fastener and pulls it against the collar. This action draws the shank through the hole; because the shank is slightly larger than the hole (the interference), it creates a compressive residual stress field around the hole. This interference-fit physics is essential because it effectively "pre-loads" the surrounding airframe material, significantly reducing the stress amplitude during flight cycles and doubling or tripling the fatigue life of the joint compared to non-interference fasteners. The "AC" coating utilizes a low-friction molybdenum disulfide or aluminum-rich barrier to ensure that the fastener "slips" into the interference hole without "galling" the base metal, preserving the metallurgical integrity of the airframe.
Note: This is a structural, flight-critical fastener. Installation requires specialized hydraulic or pneumatic pull-tools (e.g., Huck or Cherry equipment) and the matching swage collar. Hole preparation is critical; utilize a reamer to achieve the precise decimal diameter required for the interference fit. Installation must be performed by a certified A&P/AME in accordance with the Bombardier Structural Repair Manual (SRM).
Documentation
No public-facing OEM Engineering drawing for this part; refer to the Bombardier BAMS 521 Series specifications.
