McCauley A-1633-120, 5/8 ID X 3-32 Cross Section Control Shaft O'Ring - Tempest PMA
Tempest AGA-1633-120-PMA
The Tempest AGA-1633-120 (McCauley OEM A-1633-120) is an FAA-PMA replacement 5/8 id x 3-32 cross section control shaft o'ring for McCauley applications.
- Helps prevent seepage at the control shaft by restoring a proper elastomer seal where shaft motion and vibration are common.
- Supports consistent propeller RPM control by maintaining internal oil pressure integrity within the governor control circuit.
- Commonly replaced during overhaul and reseal work to reduce repeat leaks and rework after reinstallation.
This O-ring supports aviation maintenance and overhaul workflows where cross referencing by OEM part number is essential for correct sourcing.
Installation notes
These notes are general guidance only; always refer to the approved maintenance and overhaul manual for complete installation procedures.
- Use approved lubricant and installation technique to avoid twisting or nicking during assembly.
- Inspect the shaft surface and bore for scratches or corrosion that can cause repeat leaks.
Applications and fitment
Used on McCauley governors where OEM A-1633-120 is specified. Confirm eligibility by matching the OEM part number and reviewing the governor model and serial number applicability in approved maintenance data.
Tempest AGA-1633-120 is the direct replacement for OEM A-1633-120. 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-1633-120 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.01 lbs. |
| Product Dimensions | 0.8 x 0.8 x 0.1 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | A-1633-120 |
| Size | 5/8 inch ID x 3/32 inch cross section |
| System | McCauley propeller governor, control shaft sealing |
| Tempest P/N | AGA-1633-120 |
| Type | Control shaft O-ring |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 310 |
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QUESTIONS & ANSWERS
Tempest AGA-1633-120 is a direct FAA-PMA replacement for McCauley part numbers A-1633-120 and A-1633-34. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGA-1633-120 Control Shaft O-Ring is designed for use in aircraft equipped with McCauley model DCFU290D1 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGA-1633-120 Control Shaft O-Ring seals the control shaft interface within the propeller governor, preventing oil leakage while allowing smooth shaft movement during RPM adjustments. Maintaining a reliable hydraulic seal around the control shaft helps ensure consistent oil pressure, responsive governor behavior, and precise propeller speed control.
PJi offers the Tempest AGA-1633-120 as an FAA-PMA-approved replacement for the McCauley A-1633-120 or A-1633-34 control shaft O-ring. 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.
