Introduction
Procuring aircraft carbon brake heat packs is a critical decision for airlines, MRO facilities, and fleet managers. The right choice balances performance, cost, certification compliance, and supplier reliability. This guide walks you through the key factors to consider when sourcing carbon-carbon brake components for your fleet.
Step 1: Identify the Correct Part Number
Aircraft brake components are identified by specific part numbers (P/N) that correspond to a particular aircraft type and brake assembly configuration. Before contacting any supplier, you need:
- Aircraft type and series: e.g., A320-200, B737-800, B777-300ER
- Brake assembly manufacturer: e.g., Honeywell, Safran, Collins Aerospace
- Heat stack P/N: The specific part number for the heat pack assembly or individual discs
- Component Maintenance Manual (CMM) reference: For determining acceptable replacement parts
If you’re unsure about the correct P/N, check your aircraft’s Illustrated Parts Catalog (IPC) or contact the brake assembly manufacturer.
Step 2: Verify Supplier Certifications
This is non-negotiable in aviation. Ensure your supplier holds:
- PMA (Parts Manufacturer Approval) from the FAA, CAAC, or equivalent authority for the specific P/N
- Quality management certification: AS9100 or equivalent
- Production approval: Verified manufacturing capability for the components
Request copies of certifications and verify them with the issuing authority if needed.
Step 3: Evaluate Material Quality
Not all C/C brake materials are created equal. Key quality indicators include:
Density
Higher density generally correlates with better wear life and energy absorption. Typical aircraft-grade C/C brake material has a density of 1.65-1.85 g/cm³. Ask suppliers for their material density specifications.
Fiber Architecture
The preform structure affects performance:
- 2.5D needled: Standard for most commercial applications. Good balance of properties and cost
- 3D needled: Higher through-thickness strength. Better delamination resistance
- Woven: More consistent mechanical properties but typically higher cost
Manufacturing Process
- CVI (Chemical Vapor Infiltration): Produces the highest-quality C/C material with uniform carbon matrix. Standard for premium brake discs
- Resin impregnation + carbonization: Lower cost but may have lower density and less uniform properties
- Hybrid processes: Combining CVI with resin impregnation for cost-effective densification
Step 4: Compare Performance Data
Request performance data from potential suppliers:
- Dynamometer test results: Friction coefficient (μ) at various temperatures and energies
- Wear rate data: Expected wear per landing or per RTO event
- In-service track record: How many landings do their discs typically achieve in airline service?
- RTO performance: Verified performance during maximum energy rejected takeoff testing
Step 5: Assess Total Cost of Ownership
Don’t just compare purchase price — calculate the cost per landing:
Cost per landing = Purchase price ÷ Average number of landings per set
A more expensive heat pack that lasts 3,000 landings may be more economical than a cheaper alternative lasting only 1,500 landings. Also factor in:
- Brake change labor costs (fewer changes = less downtime)
- Inventory carrying costs
- Shipping and logistics
- Warranty and support terms
Step 6: Evaluate Supplier Support
A good supplier offers more than just parts:
- Technical support: Engineering assistance for installation and troubleshooting
- Warranty: Coverage for premature failures or defects
- Lead time: Typical delivery times and ability to handle AOG (Aircraft on Ground) situations
- Inventory programs: Consignment or pooling arrangements to optimize your inventory
- Documentation: Complete with certificates of conformity, test reports, and traceability records
Common Aircraft Heat Pack Part Numbers
Here are some of the most commonly requested aircraft brake heat pack part numbers:
- Airbus A320: GA32313-1, GA31984, 537-67, 537-158-1, 537-217-1
- Airbus A330/A340: 537-122-1, 2612721, 2612735, 537-34-1
- Airbus A350: 537-279-1, 537-202-1
- Boeing 737: GA32498, 537-262-1, 537-206-1
- Boeing 777: 537-213-1, GA31774-2, GA32519-2, 2612719
Why Choose CMCMAT?
CMCMAT offers CAAC PMA-certified carbon-carbon brake heat packs for major commercial aircraft types. Our advantages include:
- Competitive pricing with excellent cost-per-landing performance
- Proven in-service reliability across multiple airlines
- Comprehensive technical support
- Flexible supply arrangements including consignment programs
Browse our full product catalog or request a quote for your specific aircraft type.