McCauley A-20081-1, Shim Pressure Relief Valve - Tempest PMA
Tempest AGA-20081-1-PMA
The Tempest AGA-20081-1 (McCauley OEM A-20081-1) is an FAA-PMA replacement shim pressure relief valve for McCauley applications.
- Supports correct pressure relief calibration by setting relief valve spring preload to the required specification.
- Helps resolve pressure regulation issues when inspection shows worn, deformed, or mismatched shim stacks from prior service.
- Commonly selected during overhaul based on measured setup values and the governor manual adjustment procedure.
Relief valve shimming directly influences hydraulic stability in a constant speed propeller governor.
Installation notes
Always consult the applicable maintenance manual for the full installation procedure before performing this work.
- Do not guess shim selection. Use the inspection and setup procedure in the approved McCauley governor manual to determine the correct shim stack.
- Maintain strict cleanliness, since small debris can affect relief valve seating and pressure behavior.
Applications and fitment
Used on McCauley governors where OEM A-20081-1 is specified. Confirm compatibility by matching the OEM part number and reviewing governor model and serial number applicability in the approved maintenance data.
Tempest AGA-20081-1 is the direct replacement for OEM A-20081-1. 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-20081-1 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 0.1 x 0.1 x 0.1 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| Configuration note | The “-1” suffix identifies a specific shim variant within the A-20081 series. Select the correct variant per the approved governor overhaul data. |
| OEM P/N | A-20081-1 |
| System | McCauley propeller governor, pressure relief valve calibration |
| Tempest P/N | AGA-20081-1 |
| Type | Shim, pressure relief valve |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 182 , 210 |
| Hawker Beechcraft | A24 , A24R - Sierra 200 , Musketeer |
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QUESTIONS & ANSWERS
Tempest AGA-20081-1 is a direct FAA-PMA replacement for McCauley P/N A-20081-1. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGA-20081-1 Pressure Relief Valve Shim is designed for use in aircraft equipped with McCauley model C290D2 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGA-20081-1 Pressure Relief Valve Shim adjusts the preload of the relief valve spring to fine-tune maximum oil pressure limits. Correct shim selection is critical for precise pressure regulation and protection against overpressure-related failures.
PJi offers the Tempest AGA-20081-1 as an FAA-PMA-approved replacement for the McCauley A-20081-1 pressure relief valve shim. 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.
