Garwin 34-828-20, Return Lever Relief Valve Spring - Tempest PMA
Tempest AG34-828-20-PMA
The Tempest AG34-828-20 (Garwin OEM 34-828-20) is an FAA-PMA replacement return lever relief valve spring for Garwin applications.
- Provides the relief valve preload that helps establish stable internal governor oil pressure for consistent constant speed operation.
- Helps protect internal components by allowing controlled pressure relief under transient conditions.
- Commonly replaced during overhaul when spring fatigue, corrosion, or set is found, or when relief pressure is out of tolerance.
Pressure regulation is a core function of constant speed propeller governors, and spring condition directly affects repeatability and stability in service.
Installation notes
Always refer to the approved maintenance and overhaul manual for full installation guidance before starting work.
- Relief valve pressure must be set and verified using the approved governor maintenance procedures after spring replacement.
- Inspect the relief valve plunger, seat, and related sealing surfaces for wear or contamination that can affect pressure control.
Applications and fitment
Used on Garwin governors where OEM 34-828-20 is specified. Confirm compatibility by matching the OEM part number and reviewing governor model and serial number eligibility using approved maintenance data.
Tempest AG34-828-20 is the direct replacement for OEM 34-828-20. 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 # | AG34-828-20 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.02 lbs. |
| Product Dimensions | 2 x 0.3 x 0.3 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part (per distributor listing) |
| OEM P/N | 34-828-20 |
| System | Garwin propeller governor, pressure regulation |
| Tempest P/N | AG34-828-20 |
| Type | Relief valve spring (return lever relief system) |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 185 |
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QUESTIONS & ANSWERS
Tempest AG34-828-20 is a direct FAA-PMA replacement for Garwin P/N 34-828-20. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AG34-828-20 Relief Valve Spring 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 AG34-828-20 Relief Valve Spring provides the calibrated spring force needed for the relief valve mechanism in a Garwin propeller governor, helping the governor regulate internal oil pressure and protect against transient pressure spikes. By establishing stable oil pressure thresholds, it supports consistent constant-speed propeller control and helps prevent erratic blade pitch behavior due to uncontrolled pressure fluctuations.
PJi offers the Tempest AG34-828-20 as an FAA-PMA-approved replacement for the Garwin 34-828-20 relief valve spring. 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.
