Tronair KHC-2257 Hydraulic Coupling Kit for Agusta Helicopters
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The Tronair KHC-2557 Hydraulic Coupling Kit is designed for use on Agusta (Leonardo) helicopters, providing secure connections for both pressure and return hydraulic lines. This coupling kit is commonly used with hydraulic power units, such as the Tronair 5110 Series HPU, to help ensure safe, leak-free hydraulic servicing during aircraft maintenance operations.
Standard Features
- Adapts the hose to a specific aircraft bulkhead coupling
- Two (2) kits will be required if a dual system is ordered
Use with the KHC-4002 Hydraulic Coupling Hose Self-Adapter.
| General Information | |
|---|---|
| Part # | KHC-2257 |
| Manufacturer | Tronair |
| NSN | 4730016791831 |
| Manual 1 | View Tronair KHC-2257 Manual |
| Shipping Information | |
|---|---|
| Product Weight | 0.8 lbs. |
| Product Dimensions | 7.5 x 6.5 x 3 in. |
| Schedule B | 8412909015 |
| ECCN | EAR99 |
| Specifications | |
|---|---|
| Dual System | FR |
| Single System | BR |
| Spare Parts | |
|---|---|
| H-1512 | Wrap, Tie |
| N-2417-04 | Coupling, Pressure* - Use with 5606 Fluid Only |
| N-2418-04 | Plug, Dust |
| N-2533-02 | Coupling, Return* - Use with 5606 Fluid Only |
| N-2534-01 | Plug, Dust |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Agusta | A109A , A109C , A109E , A109S , Mark II |
PRODUCT REVIEWS
QUESTIONS & ANSWERS
The Tronair KHC-2257 hydraulic coupling kit provides secure, quick-disconnect connections between a hydraulic power unit (HPU) and Agusta helicopter hydraulic systems. It supports safe, efficient connection and disconnection during ground servicing and maintenance operations. Using proper couplings helps reduce fluid loss and minimizes the risk of contamination.
The couplings in the Tronair KHC-2257 kit are intended for use only with MIL-PRF-5606 hydraulic fluid. Using incompatible fluids can damage seals, compromise system integrity, and void manufacturer warranties. Always verify hydraulic fluid compatibility before connecting the kit to an HPU or aircraft system.
Yes, the KHC-2257 hydraulic coupling kit includes separate couplings for both pressure and return lines. This ensures proper flow direction and safe operation when servicing Agusta helicopters with compatible hydraulic power units. Correct connection of pressure and return lines is critical to prevent system damage or improper pressurization.
The Tronair KHC-2257 kit includes dust plugs for both the pressure and return couplings. These plugs help protect the hydraulic couplings from dirt, debris, and moisture when not in use. Keeping the couplings sealed when disconnected helps extend service life and maintain hydraulic system cleanliness.
While the KHC-2257 is commonly used with Tronair hydraulic power units, it may be compatible with other HPUs that meet the required connection and fluid specifications. Operators should verify fitting compatibility, pressure ratings, and fluid requirements before use. Consulting the aircraft maintenance manual or HPU documentation is strongly recommended.
Yes, individual replacement components such as pressure couplings, return couplings, dust plugs, and tie wraps are available. Using genuine Tronair replacement parts helps maintain proper fit, performance, and warranty coverage. Replacing worn components can help reduce downtime during maintenance operations.
Before each use, technicians should inspect the couplings for signs of wear, corrosion, damaged threads, or degraded seals. Dust plugs should be intact, and the couplings should connect smoothly without resistance. Any damaged or leaking components should be replaced before connecting to an aircraft hydraulic system.
No, the KHC-2257 hydraulic coupling kit should not be modified without written approval from Tronair. Unauthorized modifications can void warranties and create safety risks during hydraulic servicing. The kit is engineered specifically for Agusta helicopter applications and should be used only as intended.
The Tronair KHC-2257 hydraulic coupling kit is covered by a one-year manufacturer’s warranty against defects in materials or workmanship. Replacement parts typically carry a shorter warranty period than the original parts, as specified by the manufacturer. Following proper use and maintenance guidelines helps preserve warranty coverage and long-term reliability.
