Woodward 3989-020, Flyweight Clip Retainer Pin - Tempest PMA
Tempest AG3989-020-PMA
The Tempest AG3989-020 (Woodward OEM 3989-020) is an FAA-PMA replacement flyweight clip retainer pin for Woodward applications.
- Helps keep flyweight pin hardware captured and correctly located for reliable centrifugal speed sensing.
- Supports consistent governor response by reducing looseness and unintended movement in the flyweight pin retention stack.
- Common overhaul replacement if the retainer is worn, distorted, or damaged from prior removal and installation.
In aviation constant speed governors, flyweight retention hardware is directly tied to smooth RPM control and long term reliability.
Installation notes
Refer to the applicable governor and engine maintenance manual for full installation procedures, torque values, and inspection requirements.
- Inspect flyweight pins and mating grooves for wear that could reduce retention effectiveness.
- Use approved installation methods to avoid bending or over-stressing the retainer during assembly.
Applications and fitment
Used on Woodward governors where OEM 3989-020 is specified. Confirm eligibility by matching the OEM part number and reviewing the governor model and serial number applicability in approved maintenance data.
Tempest AG3989-020 is the direct replacement for OEM 3989-020. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
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 # | AG3989-020 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 2 x 0.5 x 0.2 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | 3989-020 |
| System | Woodward propeller governor, flyweight assembly |
| Tempest P/N | AG3989-020 |
| Type | Flyweight pin clip retainer |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Maule | M-4-210S - Rocket , M-4-210T - Rocket , M-5-210C |
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QUESTIONS & ANSWERS
Tempest AG3989-020 is a direct FAA-PMA replacement for Woodward P/N 3989-020. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AG3989-020 Flyweight Pin Retainer Clip is designed for use in aircraft equipped with Woodward model B210760 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AG3989-020 Flyweight Pin Retainer Clip secures the flyweight pin hardware within a Woodward propeller governor, ensuring the RPM-sensing flyweight assembly remains properly captured and aligned during operation. By preventing unintended movement or loosening under vibration and high-cycle loading, it helps maintain reliable flyweight motion and consistent governor response, which are critical to stable, constant-speed propeller control.
PJi offers the Tempest AG3989-020 as an FAA-PMA-approved replacement for the Woodward 3989-020 flyweight pin retainer clip. 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.
