McCauley B-20923-2, Pressure Relief O-ring - Tempest PMA
Tempest AGB-20923-2-PMA
The Tempest AGB-20923-2 (McCauley OEM B-20923-2) is an FAA-PMA overhaul pressure relief o-ring for McCauley applications.
- Supports leak control by sealing the intended interface in the pressure relief circuit where even small bypass can affect pressure stability.
- Helps restore consistent governor behavior when an aged O-ring has hardened, taken a set, or been nicked during prior service.
- Commonly replaced during overhaul and whenever the sealed joint is opened, since O-rings are typically treated as one time use in critical sealing locations.
This O-ring supports aviation constant speed propeller governor maintenance and overhaul workflows where correct OEM part number matching prevents incorrect seal selection.
Installation notes
Always consult the applicable maintenance manual for the full installation procedure before performing this work.
- Use approved lubrication and installation practices to avoid twisting, cutting, or pinching the O-ring during assembly.
- Inspect the mating groove and sealing surface for nicks, corrosion, or debris that can cause repeat leaks.
Applications and fitment
Used on McCauley governors where OEM B-20923-2 is specified. Confirm compatibility by matching the OEM part number and verifying governor model and serial number applicability in the approved maintenance data.
Tempest AGB-20923-2 is the direct replacement for OEM B-20923-2. 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 # | AGB-20923-2 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 0.5 x 0.5 x 0.1 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | B-20923-2 |
| System | McCauley propeller governor, pressure relief section |
| Tempest P/N | AGB-20923-2 |
| Type | O-ring, pressure relief sealing application |
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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-20923-2 is a direct FAA-PMA replacement for McCauley P/N B-20923-2. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGB-20923-2 Pressure Relief Valve O-Ring 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-20923-2 Pressure Relief Valve O-Ring seals the relief valve assembly to prevent internal leakage. Maintaining this seal supports consistent pressure regulation and reliable governor behavior.
PJi offers the Tempest AGB-20923-2 as an FAA-PMA-approved replacement for the McCauley B-20923-2 pressure relief valve O-ring. 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.
