McCauley A-20218, Relief Valve Piston - Tempest PMA
Tempest AGA-20218-PMA
The Tempest AGA-20218 (McCauley OEM A-20218) is an FAA-PMA replacement relief valve piston for McCauley applications.
- Controls hydraulic stability by moving within the relief valve bore to open or restrict the relief path as pressure changes.
- Helps protect the governor from abnormal pressure spikes that can contribute to leakage, sluggish response, or accelerated wear of internal components.
- Common overhaul replacement when inspection shows scoring, sticking, corrosion, or wear that can cause pressure instability.
This relief valve piston is intended for aviation use in McCauley governor maintenance, overhaul, and line replacement where OEM part numbers drive accurate cross-referencing.
Installation notes
These notes are general guidance only; always refer to the approved maintenance and overhaul manual for complete installation procedures.
- Inspect the relief valve bore and related components for scoring or contamination that can cause piston sticking.
- Follow the approved cleaning, lubrication, and functional check procedures to confirm correct pressure behavior after assembly.
Applications and fitment
Used on McCauley governors where OEM A-20218 is specified. Confirm compatibility by matching the OEM part number and verifying governor model and serial number applicability in the approved maintenance data.
Tempest AGA-20218 is the direct replacement for OEM A-20218. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
Pilot John International offers Tempest PMA propeller governor parts for propeller overhaul shops, FBOs, and aviation technicians to support aircraft maintenance and ground support.
| General Information | |
|---|---|
| Part # | AGA-20218 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.02 lbs. |
| Product Dimensions | 0.8 x 0.2 x 0.2 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | A-20218 |
| System | McCauley propeller governor, pressure relief circuit |
| Tempest P/N | AGA-20218 |
| Type | Relief valve piston |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 182 , 210 |
| Hawker Beechcraft | A24 , A24R - Sierra 200 , Beech Bonanza , Musketeer |
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QUESTIONS & ANSWERS
Tempest AGA-20218 is a direct FAA-PMA replacement for McCauley P/N A-20218. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGA-20218 Piston Relief Valve is designed for use in aircraft equipped with McCauley model C290D3 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGA-20218 Piston Relief Valve regulates maximum internal oil pressure within the propeller governor by opening when pressure exceeds a defined threshold. Proper relief valve operation protects internal components from overpressure and helps prevent RPM instability or overspeed conditions.
PJi offers the Tempest AGA-20218 as an FAA-PMA-approved replacement for the McCauley A-20218 piston relief valve. View our full selection of Tempest propeller governor parts to find the correct component for your application.
For a deeper look at how propeller governors work, why proper maintenance matters, and how to identify compatible replacement components, refer to our Ultimate Guide to Aircraft Propeller Governor Maintenance.
