McCauley A-1634-1, Unfeather Ball - Tempest PMA
Tempest AGA-1634-1-PMA
The Tempest AGA-1634-1 (McCauley OEM A-1634-1) is an FAA-PMA replacement unfeather ball for McCauley applications.
- Supports proper unfeather oil flow behavior by providing a smooth, round sealing element in a ball and seat style control point.
- Helps address unfeathering issues when inspection finds pitting, flat spots, corrosion, or contamination damage that prevents a clean seal.
- Commonly replaced during overhaul or when the unfeathering system is serviced due to the sensitivity of ball seating surfaces.
Unfeather system performance is especially important for multi engine aircraft operations and maintenance where bringing a propeller out of feather must be reliable and repeatable.
Installation notes
Refer to your aircraft and governor maintenance manual for complete installation procedures and torque values.
- Maintain strict cleanliness. Very small particles can prevent proper seating and cause leakage or inconsistent unfeather behavior.
- Inspect the matching seat and replace or rework per approved maintenance data if the seat is damaged.
Applications and fitment
Used on McCauley governors where OEM A-1634-1 is specified. Confirm compatibility by matching the OEM part number and reviewing governor model and serial number applicability in approved maintenance data.
Tempest AGA-1634-1 is the direct replacement for OEM A-1634-1. 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 # | AGA-1634-1 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 0.3 x 0.3 x 0.3 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | A-1634-1 |
| System | McCauley propeller governor, unfeathering system |
| Tempest P/N | AGA-1634-1 |
| Type | Unfeather ball (ball element for unfeather circuit) |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 310 , 421C |
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QUESTIONS & ANSWERS
Tempest AGA-1634-1 is a direct FAA-PMA replacement for McCauley P/N A-1634-1. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGA-1634-1 Unfeathering Ball is designed for use in aircraft equipped with McCauley model DCFU290D7 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGA-1634-1 Unfeathering Ball acts as a locking or check element within the unfeathering system. Controlled engagement ensures a predictable system response.
PJi offers the Tempest AGA-1634-1 as an FAA-PMA-approved replacement for the McCauley A-1634-1 unfeathering ball. 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.
