Tempest AGC-20959-PMA
The Tempest AGC-20959 (Woodward OEM C-20959) is an FAA-PMA replacement cover assembly for Woodward applications.
- Helps maintain correct internal clearances and component positioning so the governor can regulate propeller RPM consistently across power changes.
- Supports leak control by providing the correct sealing interface and gasket clamp surface when installed with the proper cover gasket and torque procedure.
- Ideal for overhaul and line maintenance when cover damage, corrosion, distortion, or sealing issues compromise governor reliability.
This cover assembly is used in aviation governor service where constant speed systems demand clean sealing faces and stable housing geometry to prevent oil leakage and performance drift. It is intended for aircraft propeller governor maintenance, overhaul, and replacement in GA and turbine support environments.
Installation notes
Always refer to the applicable aircraft and governor maintenance manual for complete installation procedures.
- Use the torque values and tightening pattern specified in the governor maintenance manual to avoid cover distortion.
- Inspect the mating face for nicks, corrosion, or warpage and replace the cover gasket if there is any sign of seepage or uneven compression.
- After installation, perform the functional checks required by approved data before return to service.
Applications and fitment
This part supports aviation maintenance and overhaul workflows where Tempest and OEM part numbers are used to cross reference replacement components for propeller governor systems. This part is applicable aircraft where C290D4 McCauley reciprocating engine speed governors are installed (examples include certain Cessna TP206A and Cessna 210 series ranges). Confirm compatibility by matching the OEM part number and reviewing the applicable governor model data and eligibility chart.
Tempest AGC-20959 is the direct replacement for OEM C-20959. Confirm applicability by governor model and serial number using approved maintenance data and published eligibility information.
Pilot John International offers Tempest PMA propeller governor parts for propeller overhaul shops, FBOs, and aviation technicians to support aircraft maintenance and ground support.
| General Information | |
|---|---|
| Part # | AGC-20959 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.1 lbs. |
| Product Dimensions | 2.5 x 2.5 x 1.5 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval basis | FAA-PMA |
| Description | Cover assembly (governor cover housing component) |
| Material and finish | Manufactured to the applicable OEM specification for strength, sealing surface quality, and corrosion resistance. Verify the exact material callout and finish requirements in the approved governor data. |
| OEM P/N | C-20959 |
| Tempest P/N | AGC-20959 |
Customers also viewed
AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 210 |
PRODUCT REVIEWS
This item does not have any reviews yet.
QUESTIONS & ANSWERS
Tempest AGC-20959 is a direct FAA-PMA replacement for McCauley P/N C-20959. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGC-20959 Cover Assembly is designed for use in aircraft equipped with McCauley model C290D4 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGC-20959 Cover Assembly encloses and protects the governor’s internal components while maintaining structural rigidity and oil containment. Proper cover fitment is essential for sealing integrity, internal alignment, and long-term governor reliability.
PJi offers the Tempest AGC-20959 as an FAA-PMA-approved replacement for the McCauley C-20959 cover 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.
