Bleed Air Duct Support Brackets

Bleed air systems function at high temperatures, typically between 400°C and 600°C, exposing support components to repeated thermal cycling. Bleed air duct support brackets must closely match the thermal expansion behavior of adjacent duct materials to avoid stress buildup at attachment points.

Material Specification

Titanium Alloy (Ti-6Al-4V, AMS 4928) or Stainless Steel (AISI 321, AMS 5647)

Duct Diameter Compatibility

2″ to 12″ (50–300 mm)

Mounting Points/Hole Pattern

4x M8 Threaded Holes (NASM 21272)

Duct Retention Method

V-Band Clamp (SAE AS21919) or Convoluted Band with Thermal Isolation Pad

Operating Temperature Range

-65°F to 1000°F (-54°C to 538°C)

Product Description

High-temperature alloys like Inconel 625 and titanium Grade 5 are used for their excellent creep resistance and phase stability under prolonged heat exposure. Mechanical joints are engineered with built-in expansion allowances, enabling axial duct movement without overstressing the bracket or anchor locations.

Load Capacity

Up to 5000 N

Thermal Expansion Compensation

Slotted Mounting Holes + Graphite-Filled PTFE Wear Pads

Surface Treatment

Aluminized Coating (AMS 2474) or Electroless Nickel Plating (AMS 2404)

Dimensional Tolerances

Bracket Flatness – 0.2mm/m

Certification Standards

FAA 25.1309

Technical Advantages

Aircraft engine bleed air systems experience multi-axis vibration, originating from both rotor imbalance and airframe structural dynamics. Bracket configurations are validated through modal analysis to ensure their natural frequencies lie outside critical excitation zones, typically between 20 Hz and 2 kHz. Fatigue design curves are derived from high-cycle testing of weldments, bolted interfaces, and bushings. Use of elastomeric isolators or flexural compliance features is governed by required vibration attenuation and load path stability. Design reviews incorporate FEA-based dynamic simulations to model stress ranges and predict crack initiation sites, mitigating unplanned maintenance arising from fatigue-driven failures. 

Bleed air duct support brackets are required to transfer complex loads including axial duct tension, bending moments, and torsional forces, especially at interface zones where ducts pass through frames, pylons, or pressure bulkheads. Load paths are optimized by aligning bracket arms with principal stress vectors and by minimizing eccentricity between the duct centerline and support axis. Structural attachments to airframe members are configured to avoid stress risers using radius-controlled transitions and compliant backing plates. Each bleed air duct support brackets design is validated to meet or exceed allowable loads with a safety margin consistent with CS-25 or FAR Part 25 structural requirements. 

 

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Industry Applications

Nacelle Bleed Air Routing Support

Provides structural mounting for high-temperature ducts transferring engine bleed air to anti-ice or cabin pressurization systems in nacelle zones. 

Wing Anti-Ice Line Stabilization

Secures bleed air ducts along wing leading edges, ensuring positional stability under thermal expansion and aerodynamic load fluctuations. 

Environmental Control System Integration

Maintains duct alignment from engine sources to ECS heat exchangers, supporting dynamic airframe conditions and variable pressure loads. 

Fuselage Frame Duct Anchoring

Anchors bleed air ducts to fuselage frames while allowing axial movement, preventing misalignment from differential expansion or airframe flexure. 

Pylon Interface Load Transfer

Transfers duct loads across engine pylon junctions, maintaining structural continuity while isolating vibration from turbomachinery-induced oscillations. 

Auxiliary Power Unit Duct Stabilization

Supports high-temperature ducting from APU to ECS in tail sections, accommodating thermal cycling and constrained installation geometries. 

 

Bleed Air Duct Support Brackets

Weight-Efficient Geometries Without Compromising Stiffness

Minimizing support bracket mass is critical for compliance with aircraft weight budgets and to reduce vibrational amplification. Topology optimization software is used during design phase to reduce non-load-bearing material while preserving required section modulus and out-of-plane stiffness. Bracket geometries are machined or investment cast depending on batch volume and complexity, using high-strength alloys with specific strength (strength-to-weight ratio) exceeding 250 kN·m/kg. 

Bleed air duct support brackets mounted in proximity to dissimilar metals or exposed to condensation cycles must be protected against galvanic corrosion and pitting. Surface treatments such as cadmium plating, titanium anodizing, or inorganic zinc-rich primers are selected based on mating surface potential and environmental class (wet/dry zones, pressurized/unpressurized). 

Bleed Air Duct Support Brackets

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure dimensional consistency in complex bracket geometries across production batches?

Frigate uses 5-axis CNC machining and CMM inspection for precise control of complex geometries and critical interface points. Each bracket undergoes fixture-based verification to ensure tolerance stack-up aligns with installation requirements. Statistical Process Control (SPC) is applied to monitor high-variation features such as mounting hole pitch and bracket angle. This ensures consistency across batches, especially for serialized aerospace assemblies. 

What fatigue life validation methods does Frigate apply for bleed air duct support brackets?

Frigate conducts high-cycle and low-cycle fatigue testing on both finished brackets and welded subassemblies using representative flight loading profiles. Finite Element Analysis (FEA) is correlated with test data to predict crack initiation zones. Strain gauges are placed at critical locations during fatigue testing to monitor localized stress. This approach supports airworthiness documentation and compliance with OEM durability standards. 

How does Frigate address the issue of stress corrosion cracking in brackets exposed to high humidity zones?

Frigate selects alloys with high resistance to intergranular corrosion and SCC, such as Inconel 625 or titanium Grade 2. All components are processed with controlled heat treatment to avoid sensitization. Protective coatings like PTFE, anodizing, or plasma spray are applied based on the environment classification. Corrosion resistance is validated through salt fog and humidity chamber testing per ASTM B117. 

 

Can Frigate provide support brackets compatible with both new and legacy aircraft platforms?

Yes, Frigate reverse-engineers existing brackets using 3D scanning and matches them with updated material and geometric specs. Compatibility with legacy systems is ensured through interface validation against original OEM standards. For new platforms, custom brackets are co-developed using FEM and CAD-to-CAM integration. Documentation includes full traceability and installation guides aligned with platform-specific service bulletins. 

What methods does Frigate use to isolate vibration in brackets mounted near bleed valves or actuators?

Frigate incorporates elastomeric bushings or flexure joints to absorb dynamic loads from valve actair duct support brackets are validated through vibration testing on shaker tables simulating aircraft conditions. The designs ensure mechanical isolation without compromising structural load paths. 

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LOCATIONS

Global Sales Office

818, Preakness lane, Coppell, Texas, USA – 75019

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

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