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This is a collection of Hartzell Service Letters. All active Hartzell Service Bulletins, Service Letters, Service Instructions, and Service Advisories are available for purchase as part of the Hartzell Technical Documents Library on CD Rom. Contact New Parts Sales at 001 (937) 778-4201 (option 1) or e-mail newpartssales@hartzellprop.com
NOTE: The following Service Letters are arranged in descending numerical order.
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| Title | Date | Revision | Description |
|---|---|---|---|
| Service Letter Index | Nov. 13, 2024 | Service Letter Index | |
| HC-SL-61-376 | Dec. 13, 2023 | TE432 Torque Wrench Adapter Modification and Alternate Mounting Washer Introduction | |
| HC-SL-61-375 | Sep. 18, 2024 | 2 | Tanis/Hartzell Part Number Cross-Reference |
| HC-SL-61-374 | Mar. 08, 2023 | Online Product Registration | |
| HC-SL-61-373 | Dec. 07, 2022 | Split Bearing Race Adhesive | |
| HC-SL-61-372 | Dec. 07, 2022 | Blade Decals | |
| HC-SL-61-371 | Aug. 05, 2021 | Alternate O-ring (p/n C-3317-AR-157) | |
| HC-SL-61-370 | Jul. 07, 2021 | Beta System Cleaning (agricultural/firefighting installations) | |
| HC-SL-30-369 | Nov. 03, 2021 | Erosion Tape on Blades w/De-ice Boots | |
| HC-SL-61-368 | Nov. 18, 2021 | Introduction of redesigned propeller hubs | |
| HC-SL-61-367 | Dec. 17, 2020 | 1 | 107995 Counterweight Mounting Bolt |
| HC-SL-61-366 | Jan. 06, 2020 | Propeller – NYCO GN3058 Grease | |
| HC-SL-61-364 | Apr. 03, 2020 | Propeller – Corrosion Inhibitor on Counterweights | |
| HC-SL-61-362 | Sep 05, 2018 | Propeller – A-1851-T Blade Retention Bearings | |
| HC-SL-61-361 | Apr 27, 2017 | Propeller – Unfeathering Tool TE316 | |
| HC-SL-61-360 | Aug 01, 2018 | 1 | Blade – Damage Evaluation for NC10245( ) Blades Installed on (but not limited to) Pilatus PC-12 Aircraft |
| HC-SL-61-359 | Oct 02, 2017 | Polane® Paint (Silver) CM163 | |
| HC-SL-61-358 | Dec 01, 2016 | Propeller – Beta System Puller TE100 | |
| HC-SL-61-354 | Aug 1, 2016 | Propeller – Lubrication Fittings | |
| HC-SL-61-353 | Nov 11, 2015 | Propeller – AeroShell 5 Grease | |
| HC-SL-61-346 | Oct 1, 2015 | Spinner – Bulkhead Modification | |
| HC-SL-61-343 | Apr 1, 2014 | Product Category – Lubrication Procedure | |
| HC-SL-30-335 | Nov. 01, 2019 | 3 | Restrainer Strap Installation |
| HC-SL-61-324 | Oct 21, 2011 | Blade – Aluminum Blade Field Repair | |
| HC-SL-30-308 | Dec. 07, 2022 | 1 | Hartzell PMA De-ice Components |
| HC-SL-30-304 | Dec 22, 2015 | 3 | Propeller modification to anti-ice configuration |
| HC-SL-30-295 | Nov 06, 2013 | 3 | New PC-12 De-Ice boot |
| HC-SL-61-294 | May 15, 2012 | 1 | field Maintenance of Hartzell Composite Blades – NOTE: This Service Document has been replaced by Hartzell Manual 170 |
| HC-SL-30-279 | Mar 06, 2013 | 8 | Introduction of De-ice boot 6-digit Hartzell De-Ice boots replacing a “4H” De-ice boot |
| HC-SL-61-277 | Sep 16, 2020 | 6 | Governor installation instructions |
| HC-SL-61-265 | Oct 09, 2009 | 2 | Introduction of smooth forged hubs for 3-blade compact propellers |
| HC-SL-30-260 | Sep. 01, 2022 | 23 | Introduction of Hartzell airframe mounted Ice protection components, De-ice boots and Anti-ice feed shoes |
| HC-SL-30-259 | Mar. 09, 2022 | 15 | Introduction of Hartzell De-Ice components(wire harness, slip rings, and De-ice boots) |
| HC-SL-61-254 | Mar. 09, 2022 | 1 | Propeller – Propeller Operating Restrictions |
| HC-SL-30-246 | Jun 02, 2005 | De-Ice – Spare Parts Release | |
| HC-SL-61-241 | Feb 02, 2015 | 3 | Introduction of B-7726 blade seal for lightweight turbine propellers |
| HC-SL-61-231 | Apr 01, 2004 | Propellers – Use of Propeller Jack | |
| HC-SL-61-225 | Dec 18, 2003 | 1 | Spinners – Spinner Dome and Bulkhead Assembly Manufacturing Process Improvements |
| HC-SL-61-187 | Mar. 09, 2022 | 5 | Alternate lubrication fittings for aluminum hub propellers |
| HC-SL-61-171 | May 28, 1996 | Spinner dome and bulkhead interchangeability | |
| HC-SL-61-165 | Dec 07, 1995 | All propellers – Warning to evaluate unusual grease leaks or vibration | |
| HC-SL-61-61Y | Sep. 18, 2024 | 16 | Overhaul periods and Service life limits for Hartzell Propeller Inc. Aviation Components – Propellers, Governors. Accumulators, and Propeller Damper Assemblies (Ref. AD 77-12-06) |
| HC-SL-61-48A | Dec. 07, 2022 | 3 | Propeller – Diaphram Inspection |
