McCauley A-1639-28 / B-20923, Detail Seal Nut - Tempest PMA
Tempest AGB-20923-PMA
The Tempest AGB-20923 (McCauley OEM A-1639-28 / B-20923) is an FAA-PMA replacement detail seal nut for McCauley applications.
- Helps maintain proper clamp load at the intended joint, supporting stable alignment of the assembled governor components.
- Supports vibration resistance through the self-sealing style design typically specified for governor hardware locations.
- Common replacement during overhaul or line service when a nut has been removed, shows damaged threads, or no longer meets self-sealing performance requirements.
This sealing nut is intended for aviation propeller governor maintenance where OEM part numbers drive accurate cross-referencing and purchasing.
Installation notes
Refer to the applicable governor and engine maintenance manual for full installation procedures, torque values, and inspection requirements.
- Use the torque value and procedure specified in the applicable governor manual. Do not substitute generic torque guidance.
- Replace any self-sealing nut that no longer provides the required prevailing torque or sealing performance per approved maintenance data.
Applications and fitment
Used on McCauley governors where OEM A-1639-28 and or B-20923 is specified. Confirm compatibility by matching the OEM part number and verifying governor model and serial number applicability in the approved maintenance data.
Tempest AGB-20923 is a direct replacement for OEM A-1639-28 and B-20923. 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 # | AGB-20923 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.02 lbs. |
| Product Dimensions | 1 x 1 x 0.2 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | A-1639-28 / B-20923 |
| System | McCauley propeller governor, specified hardware location |
| Tempest P/N | AGB-20923 |
| Type | Detail seal nut, self-sealing style hardware |
Customers also viewed
Customers who bought this item also purchased
AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 182 , 210 |
| Hawker Beechcraft | A24 , A24R - Sierra 200 , Beech Bonanza , Musketeer |
PRODUCT REVIEWS
This item does not have any reviews yet.
QUESTIONS & ANSWERS
Tempest AGB-20923 is a direct FAA-PMA replacement for McCauley part numbers B-20923 and A-1639-28. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGB-20923 Seal Nut is designed for use in aircraft equipped with McCauley model C290D3 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGB-20923 Seal Nut secures threaded components while providing integrated oil sealing. Preventing leakage at these interfaces is critical for maintaining pressure integrity.
PJi offers the Tempest AGB-20923 as an FAA-PMA-approved replacement for the McCauley B-20923 or A-1639-28 seal nut. 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.
