McCauley C-20887B, Blank Drive Gear - Tempest PMA
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Tempest AGD-20887B-PMA
The Tempest AGD-20887B (McCauley OEM C-20887B) is an FAA-PMA replacement blank drive gear for McCauley applications.
- Supports dependable mechanical drive transfer inside the governor, which is essential for consistent oil pump operation and stable RPM governing.
- Common replacement during overhaul when gear wear, tooth damage, or fit issues create backlash, noise, or contamination concerns.
- The blank configuration is typically used to match specific governor build requirements, so cross referencing by OEM part number is critical.
This drive gear is intended for aviation propeller governor maintenance and overhaul work where correct drive train geometry helps maintain governor response and reliability. It supports aircraft constant speed propeller systems in GA and commercial support environments.
Installation notes
Always refer to the applicable aircraft and governor maintenance manual for complete installation procedures.
- Inspect mating gears and bearings for abnormal wear patterns that may indicate misalignment or prior contamination.
- Maintain strict cleanliness to protect the governor pump and pilot valve circuits during reassembly.
- Complete all functional tests required by approved data before return to service.
Applications and fitment
This component supports aviation maintenance and overhaul workflows where Tempest and OEM part numbers are used to cross reference McCauley governor internals. Distributor eligibility charts commonly associate the AGD-20887 family with installations where specific McCauley governor models are installed (examples include certain Beechcraft A23-24 and some Cessna P206 and 210 series ranges where C290D3 governors are installed). Confirm compatibility by matching the OEM part number and validating governor model and eligibility chart requirements.
Tempest AGD-20887B is used as the replacement for OEM C-20887B. Some supplier catalogs may reference D-20887B for the same configuration. Confirm applicability by governor model, serial number, and approved illustrated parts 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 # | AGD-20887B |
| Manufacturer | Tempest |
| Specifications | |
|---|---|
| Approval basis | FAA-PMA (listed for the AGD-20887 drive gear family by major aviation parts distributors) |
| Description | Drive gear, blank (governor drive train component) |
| Material and finish | Manufactured to OEM specification for strength, wear performance, and dimensional accuracy. Verify gear inspection limits, backlash requirements, and lubrication guidance in approved governor data. |
| Notes on nomenclature | Some catalogs reference this as D-20887B. Confirm by OEM part number and governor model breakdown. |
| OEM P/N | C-20887B |
| Tempest P/N | AGD-20887B |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 206 , 210 |
| Hawker Beechcraft | A24 , A24R - Sierra 200 , Beech Bonanza , Musketeer |
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QUESTIONS & ANSWERS
Tempest AGD-20887B is a direct FAA-PMA replacement for McCauley P/N D-20887B. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGD-20887B Drive Gear 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 AGD-20887B Drive Gear mechanically couples the governor to the engine, enabling RPM sensing and oil pressure generation. Reliable gear engagement is essential for continuous governor operation.
PJi offers the Tempest AGD-20887B as an FAA-PMA-approved replacement for the McCauley D-20887B drive gear. 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.
