McCauley B-20255, Adjusting Plug Relief Valve - Tempest PMA
Tempest AGB-20255-PMA
The Tempest AGB-20255 (McCauley OEM B-20255) is an FAA-PMA replacement adjusting plug relief valve for McCauley applications.
- Supports correct relief valve calibration by establishing the specified spring preload as defined by the approved overhaul procedure.
- Helps prevent pressure regulation issues when a worn or damaged plug causes improper adjustment range, leakage, or inconsistent seating.
- Often replaced during overhaul when inspection finds damaged threads, sealing surface wear, or evidence of prior over torque and deformation.
Relief valve adjustment is a critical setup step in constant speed governor overhaul because pressure behavior directly influences response and RPM stability.
Installation notes
Always refer to the applicable aircraft and governor maintenance manual for complete installation procedures.
- Do not guess relief settings. Use the approved calibration method and test equipment specified for the governor model being serviced.
- Replace any associated seal, gasket, or washer as required by the approved maintenance data to prevent leakage.
Applications and fitment
Used on McCauley governor assemblies where OEM B-20255 is specified. Confirm compatibility by matching the OEM part number and reviewing governor model and serial number applicability in approved maintenance data.
Tempest AGB-20255 is the direct replacement for OEM B-20255. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
Pilot John International supplies Tempest PMA propeller governor components to propeller overhaul shops, FBOs, MROs, and aviation maintenance technicians supporting aircraft maintenance and ground support.
| General Information | |
|---|---|
| Part # | AGB-20255 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 0.8 x 0.5 x 0.5 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | B-20255 |
| System | McCauley propeller governor, pressure relief valve adjustment |
| Tempest P/N | AGB-20255 |
| Type | Adjusting plug, relief valve |
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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 AGB-20255 is a direct FAA-PMA replacement for McCauley P/N B-20255. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGB-20255 Relief Valve Adjusting Plug 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 AGB-20255 Relief Valve Adjusting Plug allows precise calibration of relief valve settings. Accurate adjustment ensures oil pressure remains within safe operating limits.
PJi offers the Tempest AGB-20255 as an FAA-PMA-approved replacement for the McCauley B-20255 relief valve adjusting plug. 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.
