Garwin 34-828-25, Relief Valve Copper Seal - Tempest PMA
Tempest AG34-828-25-PMA
The Tempest AG34-828-25 (Garwin OEM 34-828-25) is an FAA-PMA replacement relief valve copper seal for Garwin applications.
- Helps prevent oil leakage at the relief valve interface by providing a conforming copper seal surface when torqued per the approved procedure.
- Supports stable governor pressure control by maintaining seal integrity during vibration and thermal cycling.
- Commonly replaced during overhaul or any time the relief valve is removed, since copper sealing washers are typically one time use once crushed.
This seal supports aviation maintenance and overhaul workflows where Tempest and OEM part numbers are used to cross reference replacement components for legacy Garwin constant speed propeller governors.
Installation notes
Always refer to the applicable aircraft and governor maintenance manual for complete installation procedures.
- Install using the torque and any specified surface prep in the approved governor maintenance data.
- Do not reuse a crushed copper seal. Replace if the joint is disturbed or if seepage is found during inspection.
Applications and fitment
Used on Garwin propeller governors where OEM 34-828-25 is specified. Confirm compatibility by matching the OEM part number and reviewing the approved maintenance data for the governor model and aircraft installation.
Tempest AG34-828-25 is the direct replacement for OEM 34-828-25. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
Pilot John International stocks Tempest PMA propeller governor parts for propeller overhaul shops, MROs, FBOs, and A&P mechanics supporting aircraft maintenance and ground support operations.
| General Information | |
|---|---|
| Part # | AG34-828-25 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 0.8 x 0.8 x 0.1 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | 34-828-25 |
| System | Garwin propeller governor, relief valve sealing |
| Tempest P/N | AG34-828-25 |
| Type | Copper seal washer for relief valve |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 185 |
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QUESTIONS & ANSWERS
Tempest AG34-828-25 is a direct FAA-PMA replacement for Garwin P/N 34-828-25. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AG34-828-25 Relief Valve Copper Seal is designed for use in aircraft equipped with Garwin 38-828 series propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AG34-828-25 Relief Valve Copper Seal provides a crush-type oil seal at the relief valve interface, preventing leakage under high pressure and maintaining the integrity of the internal governor pressure. Maintaining a reliable seal in the pressure regulation system helps ensure consistent RPM control and reduces the risk of oil loss and performance degradation in the propeller governor.
PJi offers the Tempest AG34-828-25 as an FAA-PMA-approved replacement for the Garwin 34-828-25 relief valve copper seal. 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.
