McCauley A-20139, Unfeather Ball Spring - Tempest PMA
Tempest AGA-20139-PMA
The Tempest AGA-20139 (McCauley OEM A-20139) is an FAA-PMA replacement unfeather ball spring for McCauley applications.
- Supports reliable unfeather operation by restoring the correct spring force specified for the unfeather mechanism.
- Helps address unfeathering symptoms such as inconsistent engagement or sluggish return when inspection finds weakened, corroded, or distorted springs.
- Common overhaul replacement due to spring fatigue, corrosion risk, and the importance of consistent force in the unfeather circuit.
Unfeather system reliability is especially important for multi engine aircraft maintenance and dispatch readiness.
Installation notes
Refer to the applicable governor and engine maintenance manual for full installation procedures, torque values, and inspection requirements.
- Inspect related pins, balls, plugs, and seats for matched wear to avoid replacing a spring while leaving the root cause unresolved.
- After assembly, perform the operational checks required by the approved governor and aircraft maintenance data.
Applications and fitment
Used on McCauley governors where OEM A-20139 is specified. Confirm eligibility by matching the OEM part number and reviewing governor model and serial number applicability in approved maintenance data.
Tempest AGA-20139 is the direct replacement for OEM A-20139. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
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 # | AGA-20139 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 1 x 0.3 x 0.3 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | A-20139 |
| System | McCauley propeller governor, unfeathering mechanism |
| Tempest P/N | AGA-20139 |
| Type | Spring, unfeather |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 310 |
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QUESTIONS & ANSWERS
Tempest AGA-20139 is a direct FAA-PMA replacement for McCauley P/N A-20139. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGA-20139 Unfeathering Spring is designed for use in aircraft equipped with McCauley model DCFUS290D6 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGA-20139 Unfeathering Spring provides the force required to return the propeller from a feathered condition. Reliable spring performance is essential for safe propeller recovery.
PJi offers the Tempest AGA-20139 as an FAA-PMA-approved replacement for the McCauley A-20139 unfeathering spring. 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.
