McCauley B-20889, Flyweight Assembly - Tempest PMA
Tempest AGB-20889-PMA
The Tempest AGB-20889 (McCauley OEM B-20889) is an FAA-PMA replacement flyweight assembly for McCauley applications.
- Provides the speed sensing function that allows a constant speed propeller governor to respond to RPM changes and command corrective oil control action.
- Supports stable RPM control by maintaining correct flyweight geometry and assembly integrity compared with worn, fretted, or out of tolerance flyweight components.
- Often addressed during overhaul when wear or damage is present in the flyweight area, since condition here can directly affect smoothness and control repeatability.
Flyweights are at the heart of the governor’s feel because they translate rotational speed into control force. When flyweight components wear, the result can be hunting, inconsistent response, or difficulty holding target RPM. This Tempest replacement is supplied for aviation propeller governor maintenance where OEM part numbers drive ordering accuracy and compliance.
Installation notes
Always consult the applicable maintenance manual for the full installation procedure before performing this work.
- Follow the governor manual assembly sequence and inspection criteria, paying close attention to wear surfaces, freedom of movement, and any specified lubrication points.
- If replacing due to control issues, inspect related flyweight pins, retainers, and the pilot valve area for correlated wear per the approved troubleshooting guidance.
Applications and fitment
Used where OEM B-20889 is specified for McCauley governor flyweight assembly applications. Confirm fit by governor model, dash number, and serial number using approved maintenance data and the illustrated parts breakdown.
Tempest AGB-20889 is the direct replacement for OEM B-20889. Confirm applicability by governor model and serial number in the approved maintenance data before ordering or installing.
Pilot John International carries Tempest PMA propeller governor parts for FBOs, propeller overhaul shops, and aviation technicians supporting aircraft maintenance and ground support work.
| General Information | |
|---|---|
| Part # | AGB-20889 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA PMA |
| Material and finish | Manufactured to the OEM flyweight assembly specification. Refer to the governor manual for inspection limits and any pairing requirements with pins, platforms, or retainers. |
| OEM P/N | B-20889 |
| Tempest P/N | AGB-20889 |
| Type | Flyweight assembly, McCauley governor speed sensing component |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 206 , 210 |
| Hawker Beechcraft | A24 , A24R - Sierra 200 , Musketeer |
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QUESTIONS & ANSWERS
Tempest AGB-20889 is a direct FAA-PMA replacement for McCauley P/N B-20889. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGB-20889 Flyweight Assembly is designed for use in aircraft equipped with McCauley model C290D2 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGB-20889 Flyweight Assembly senses engine RPM through centrifugal force and mechanically actuates the pilot valve as speed changes. Accurate flyweight movement is critical for stable RPM regulation, smooth governor response, and consistent blade pitch control.
PJi offers the Tempest AGB-20889 as an FAA-PMA-approved replacement for the McCauley B-20889 flyweight assembly. 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.
