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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 Mar. 04, 2021 Service Letter Index
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-30-365 July 03, 2019 De-ice – 107083 Hub Clamping Bolt
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-61-350 Jun 1, 2018 1 Propeller – Piston Unit C-497( )
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 Apr 18, 2012 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HC-SL-61-294 May 15, 2012 1 field Maintenance of Hartzell Composite Blades – NOTE: This Service Document has been replaced by Hartzell Manual 170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 Oct 27, 2014 22 Introduction of Hartzell airframe mounted Ice protection components, De-ice boots and Anti-ice feed shoes
HC-SL-30-259 Mar 15, 2016 14 Introduction of Hartzell De-Ice components(wire harness, slip rings, and De-ice boots)
HC-SL-61-254 Feb 24, 2006 Propeller – Propeller Operating Restrictions
HC-SL-30-246 Jun 02, 2005 De-Ice – Spare Parts Release
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-61-185 Oct 21, 2016 3 Tachometers
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 Mar. 04, 2021 13 Overhaul periods and Service life limits for Hartzell Propeller Inc. Aviation Components – Propellers, Governors. Accumulators, and Propeller Damper Assemblies (Ref. AD 77-12-06)
哈泽尔服务信函61-61Y 2015年12月22日 9 哈泽尔螺旋桨以及包含调速器、储压器和减震器类航空组件的大修周期和使用寿命限制说明
HC-SL-61-48A Apr 15, 2014 2 Propeller – Diaphram Inspection
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