McCauley B-20066 / A-20266 / B-20910, Finished Pilot Valve Spool - Tempest PMA
Tempest AGB-20910-PMA
The Tempest AGB-20910 (McCauley OEM B-20066 / A-20266 / B-20910) is an FAA-PMA replacement finished pilot valve spool for McCauley applications.
- Supports stable RPM control by providing the correct pilot spool geometry and finish so oil is metered consistently through the pilot valve section.
- Helps reduce common symptoms tied to pilot valve wear, including hunting, slow response to RPM changes, or difficulty holding set RPM.
- Commonly replaced during overhaul when inspection finds scoring, sticking, or finish damage that can cause internal leakage or erratic governing.
This pilot valve spool is intended for aviation use in McCauley governor maintenance and overhaul where OEM part numbers are the primary way technicians verify interchangeability and eligibility.
Installation notes
Always consult the applicable maintenance manual for the full installation procedure before performing this work.
- Maintain strict cleanliness during assembly. Small debris in the pilot valve area can cause spool sticking and unstable governing.
- Inspect the bore, associated seals, and related pilot valve components for matched wear per approved overhaul data.
Applications and fitment
Used on McCauley governors where OEM B-20066, A-20266, or B-20910 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-20910 is a direct replacement for OEM B-20066, A-20266, and B-20910. 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-20910 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.7 lbs. |
| Product Dimensions | 2.5 x 1 x 1 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | B-20066 / A-20266 / B-20910 |
| System | McCauley propeller governor, pilot valve and governing circuit |
| Tempest P/N | AGB-20910 |
| Type | Pilot valve spool, finished |
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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-20910 is a direct FAA-PMA replacement for McCauley part numbers B-20910, A-20266, and B-20066. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGB-20910 Pilot Valve Spool 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-20910 Pilot Valve Spool is the precision sliding element that meters oil to and from the propeller hub. Proper spool movement enables accurate blade pitch changes and stable RPM control.
PJi offers the Tempest AGB-20910 as an FAA-PMA-approved replacement for the McCauley B-20910, A-20266, or B-20066 pilot valve spool. 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.
