Woodward GB-59, Idler Gear Bearing - Tempest PMA
Tempest AG34-0059-PMA
The Tempest AG34-0059 (Woodward OEM GB-59) is an FAA-PMA replacement idler gear bearing for Woodward applications.
- Supports smooth idler gear rotation, helping reduce friction and wear in the governor geartrain.
- Helps maintain correct gear alignment and stability, reducing the risk of gear noise, debris generation, and timing related wear.
- Frequently replaced during overhaul when bearing surfaces show wear, scoring, or contamination damage.
In aviation constant speed governor service, geartrain condition is a key reliability driver because the governor must respond consistently under vibration and changing loads.
Installation notes
Refer to the applicable governor and engine maintenance manual for full installation procedures, torque values, and inspection requirements.
- Inspect the idler gear, stud, and mating surfaces for wear and replace matched components as required.
- Maintain strict cleanliness during assembly to prevent early bearing wear from contamination.
Applications and fitment
Used on Garwin governors where OEM GB-59 is specified. Confirm compatibility by matching OEM part number and reviewing governor model and serial number applicability in the approved maintenance data.
Tempest AG34-0059 is the direct replacement for OEM GB-59. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
Pilot John International stocks Tempest PMA propeller governor parts for propeller overhaul shops, MROs, FBOs, and A&P mechanics supporting aircraft maintenance and ground support operations.
| General Information | |
|---|---|
| Part # | AG34-0059 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.02 lbs. |
| Product Dimensions | 0.5 x 0.3 x 0.3 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part (per distributor listing) |
| OEM P/N | GB-59 |
| System | Garwin propeller governor, geartrain |
| Tempest P/N | AG34-0059 |
| Type | Idler gear bearing |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 185 |
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QUESTIONS & ANSWERS
Tempest AG34-0059 is a direct FAA-PMA replacement for Garwin P/N GB-59. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AG34-0059 Idler Gear Bearing is designed for use in aircraft equipped with Garwin 34-828 series propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AG34-0059 Idler Gear Bearing supports smooth rotation of the idler gear within the governor’s oil pump system, reducing friction and wear that can degrade hydraulic pressure generation. Enabling reliable gear motion under load helps maintain stable oil flow and consistent RPM control throughout governor operation.
PJi offers the Tempest AG34-0059 as an FAA-PMA-approved replacement for the Garwin GB-59 idler gear bearing. 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.
