McCauley A-20078, Stamped, Crush Washer - Tempest PMA
Tempest AGA-20078-PMA
The Tempest AGA-20078 (McCauley OEM A-20078) is an FAA-PMA replacement stamped, crush washer for McCauley applications.
- Helps control oil leakage at the intended sealing interface by providing a crush-style seal that conforms under proper torque.
- Supports reliable governor operation by maintaining seal integrity through vibration and thermal cycling common in aircraft service.
- Typically replaced any time the joint is disturbed, since crush washers are generally treated as one time use once deformed.
This crush washer supports aviation propeller governor maintenance, overhaul, and line replacement workflows where correct part number cross reference prevents mismatched sealing hardware.
Installation notes
Always refer to the approved maintenance and overhaul manual for full installation guidance before starting work.
- Do not reuse a crushed washer. Replace it if the fitting or plug is loosened or removed.
- Use the torque value and sealing surface preparation specified in the approved maintenance data to avoid leaks and joint damage.
Applications and fitment
Used on McCauley governors where OEM A-20078 is specified. Confirm compatibility by matching the OEM part number and verifying the specific governor model and installation in approved maintenance data.
Tempest AGA-20078 is the direct replacement for OEM A-20078. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
Pilot John International carries Tempest PMA propeller governor parts for FBOs, propeller overhaul shops, and aviation technicians supporting aircraft maintenance and ground support work.
| General Information | |
|---|---|
| Part # | AGA-20078 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 1 x 1 x 0.1 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | A-20078 |
| System | McCauley propeller governor, sealing washer application |
| Tempest P/N | AGA-20078 |
| Type | Stamped crush washer |
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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-20078 is a direct FAA-PMA replacement for McCauley P/N A-20078. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGA-20078 Stamped Crush Washer 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-20078 Stamped Crush Washer creates a pressure-tight seal at threaded connections within the governor assembly. Proper sealing prevents oil leakage that could reduce available oil pressure or introduce fire risk in the engine compartment.
PJi offers the Tempest AGA-20078 as an FAA-PMA-approved replacement for the McCauley A-20078 stamped crush washer. 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.
