Hartzell Engine Technologies
August 6, 2025
Service Letter #228

Maintenance and Overhaul Manual 400600-0000 Supersedure: Affects the 400600-0000 manual.

January 27, 2025
Service Letter #223
Turbocharger 465398-2 BOM Update: Affects the AeroForce Turbocharger 465398-2.
July 13, 2024
Service Letter #216
Turbocharger Pressure Controller Screw P/N Update:  Affects Aeroforce absolute pressure controller P/Ns 470924-( ), 481008-( ), and 481012-( ).
May 15, 2024
Alert Service Bulletin #213
Turbocharger Turbine Housing Bolt P/N 400132-0301 Inspection.  Affects HET turbocharger assembly P/Ns 465292-2, 465292-4, 465398-2, 466642-1, and 466642-2.
March 27, 2024
Alert Service Bulletin #210
Turbocharger Turbine Housing Inspection.  Affects turbocharger P/N 406610-9005 rebuilt with turbine housing P/N 406722-0021 manufactured by Hartzell Engine Tech LLC (HET) between 6/01/2023 and 9/14/2023.
October 12, 2023
Service Bulletin #205
Turbocharger V-Band Torque Check.  Affects overhauled or repaired Aeroforce turbocharger models TE06, TH08, TH08A, TA8102, T18A, and TA61 manufactured by Hartzell Engine Tech.
August 28, 2023
Service Bulletin #203
Undersized Turbocharger Journal Bearing: Affects New, rebuilt, or overhauled Aeroforce turbochargers manufactured by Hartzell Engine Tech with journal bearing P/N 406902-0000 between 10/31/2022 and 5/17/2023.
May 25, 2023
Service Bulletin #099
Exhaust Bypass Valve FAA PMA Notification.  Authorizes the use, repair, and overhaul of exhaust bypass valve P/N 470842-0009.
April 20, 2022
Service Bulletin #088
  • Date:  April 14, 2022
  • Title:  Service Bulletin #088
  • Description: Turbocharger Center Housing Inspection – Affects turbocharger center housing P/N 441320-0006, new or overhauled.
March 11, 2022
Service Letter #089
Wastegate Expander Ring P/N 476762-0000.  Affects wastegate assembly P/Ns 470780-( ), 470818-( ), 470830-( ), 470842-( ), 470908-( ), 470954-( ), and 481064-( ).  
June 16, 2021
Service Bulletin #058 Rev. A
Turbocharger – Back Plate Assembly Replacement at Overhaul. Affects TH08 model turbochargers with P/N 406795-0058 Back Plate Assemblies.
July 10, 2019
Service Bulletin #079 Rev.A
Turbocharger Wastegate and Valve Assembly Inspection Turbocharger wastegate and valve assemblies P/N 470818-( ) and 470954-( ) are affected. Replacement of affected serial numbers is required.
February 6, 2018
Service Letter #073
TA04 & TA36 Turbocharger Left-Hand Thread Turbine Wheel Assembly Change Notification Introduces new left hand threaded turbine wheels P/Ns 490033-0019, 490033-0025, 490033-0028, 490034-0006, 490034-0019, and new left hand threaded compressor wheel nut, P/N 444205-0001.
December 26, 2017
Alert Service Bulletin #074 Rev. A
Turbocharger Center Housing Inspection. -  Turbochargers containing certain serial number p/n 441320-12 center housings are affected.  Replacement or factory inspection and rework of affected center housings is required. This center housing is used in several turbocharger models used on a variety of aircraft.
September 1, 2016
Service Bulletin #067
Turbocharger Wastegate Poppet Valve Replacement – HET P/N 477285-0002 Affects HET Wastegate Poppet Valve assembly P/N 470892-0002, -9002 (Continental P/N (R-)635381-2) used on HET Turbocharger assembly P/N 409680-(9,0)001, 409680-(9,0)011 (Continental P/N 640327-1, 640327-11).
July 7, 2015
Service Letter #058
Turbocharger – P/N CF600400-00 Turbine Housing Gasket Supersedure. Affects 600 Series (Rajay) Turbochargers.  Introduces P/N 490009 Turbine Housing Gasket.
August 28, 2014
Alert Service Bulletin #060 Rev. 1
Turbocharger P/N 441320-0007 Center Housing Inspection. Affects P/N 407540-(0,9)003 and 407800-(0,9)003 Turbocharger Assemblies with specified date coded center housings.
February 11, 2014
Alert Service Bulletin #057
Turbocharger Back Plate Assembly P/N 406795-0058 Replacement. Affects certain TH08 model turbochargers containing back plates produced between June 1, 2012 and September 30, 2013.
November 4, 2013
Alert Service Bulletin #048 Rev 3
Turbocharger TA0411 P/N 410188-0019 Turbine Wheel Replacement. Affects P/N 466642-(0,9)001, 466642-(0,9)002, 466642-(0,9)006 Turbocharger Assemblies with specified serial numbered turbine wheels.
May 8, 2012
Alert Service Bulletin #047
Turbocharger P/N 406610-0005 or -9005 & Turbocharger Center Housing P/N 409836-0005 Recall. Affects turbochargers with specified serial numbers and center housings with a specified date code.
June 30, 2011
Service Bulletin #042
Turbocharger Journal Bearing Recall. Affects HET P/N 407134-0000 turbocharger journal bearings with specified date codes.
March 29, 2011
Service Information Letter #A-142
Turbocharger Installation and Turbine Housing Mounting Tab Shim Washers. Affects installation of 406610-0005 or 406610-9005 turbochargers.
December 22, 2010
Service Bulletin #040 Rev. A
Turbocharger CHRA Contamination. Requires cleaning of center housings bearing slant A foundry mark on turbochargers with specified serial numbers.
February 10, 2010
Service Bulletin #039 Rev. A
Turbine Wheel Replacement. Affects turbochargers that were factory rebuilt between January, 2007 and June, 2009.
June 2, 2008
Service Information Letter #A-131
Turbocharger P/N 466304-0003 Data Tag Inspection. Affects Cirrus SR22 with Tornado Alley Turbonormalizing System.
April 1, 2008
Service Bulletin #030 Rev. A
Turbocharger Exhaust Flange Inspection And/Or Turbine Housing Replacement (TCM). Affects turbine housing(s) P/N 441977-0023 & 441977-0025 in specified serial numbered turbocharger P/N’s 465680-0004, 465930-0002, 466412-0003, 465930-0003, and 466412-0004.
February 28, 2008
Service Bulletin #031
Turbocharger Exhaust Flange Inspection And/Or Turbine Housing Replacement (Parts). Affects turbine housing P/Ns 441977-0023 & 441977-0025 with specified date code or turbocharger P/Ns 409170-9001, 465680-9005, 465930-9002, or 465930-9003 with specified serial numbers.
February 1, 2008
Service Bulletin #029
Turbocharger Exhaust Flange Inspection And/Or Turbine Housing Replacement. Affects turbocharger P/N 409170-0001 (Lycoming LW-12463) with specified serial numbers.
July 27, 2007
Service Bulletin #026 Rev. B
Turbocharger Inspection And Replacement. Affects P/N 466304-0003 Turbocharger Assemblies with specified serial numbers.
July 25, 2007
Service Bulletin #027
Turbocharger Inspection And Replacement. Affects P/N 466304-0003 Turbocharger Assemblies (TCM P/N 646677) with specified serial numbers.
March 5, 2007
Service Information Letter #A-124
Alternate Turbine Housing for P/N 407810-0001 Turbocharger.  Affects all engines utilizing turbocharger P/N 407810-0001.
May 19, 2006
Service Letter #019 Rev. B
Reissue and Supersedure of Turbocharger Overhaul manual. Introduces P/N 400600-0000 Turbocharger Overhaul & Maintenance Manual replacing Garrett / Honeywell Manual TP20-0128 and Rajay Manual 600999-0000
February 8, 2006
Service Bulletin #023
Turbocharger System Operational Tests. Turbocharger installation and test procedures.
September 1, 2004
Service Bulletin #022 Rev. A
Recommended Service / Inspection. Affects P/N 466011-0002 Turbocharger (46C19836) with specified serial numbers.
February 7, 2003
Service Information Letter #A-111
Recommended Service/Inspection for Cessna 402C Exhaust By-Pass Valve Assembly. Affects P/N 470908-9013 (Cessna P/N C165006-0107) Exhaust By-Pass Valves installed on Cessna 402C aircraft.
January 30, 2003
Customer Information Bulletin #CIB-2008
Replacement of Aerostar Turbocharger Oil Scavenge Pumps. Provides Aerostar Models 601, 601P, 602P, 700P with P/N CF300110-001 or CF300110-002 Pumps as an FAA approved alternate means of compliance with AD 2002-24-07 (Aerostar SB600-131A).
October 17, 2001
Service Bulletin #020
406610-9005 (Cessna P/N: C295001-0101) Turbochargers with missing anti-rotation pins. Affects Model TE0659 Turbochargers with specified serial numbers.
September 24, 1982
Rotomaster Service Letter #27A
Rajay Turbocharger Model 325E10 Inspection of Turbine Housings P/N TC-60-11 and/or 600510-01, 600510-02. Requires repetitive inspection of affected turbine housings at 200 hour intervals per FAA Airworthiness Directive 82-27-03.