Hartzell Engine Technologies
March 13, 2025
Alert Service Bulletin #224
Alternator Spacer P/N 41151 Inspection:  Affects Plane Power alternator P/Ns ALV-9610, ES-10024, and ES-6024D shipped between 11/07/2023 and 09/18/2024.
February 28, 2025
Alert Service Bulletin #221
Alternator Replacement: Continental O-300 Series Engines Only.  Affects Plane Power 15-1010 and 15-1014 series alternators when installed on aircraft utilizing Continental Aerospace Technologies’ O-300 series engines between 01/01/2019 and 12/15/2024.
October 4, 2024
Service Bulletin #209
Alternator Mounting Bracket Inspection: Affects Plane Power alternator P/Ns 10-1050 or AL12-50C, 10-1050C or SAL12-70C, and 10-5050C or TAL24-70C
September 5, 2024
Service Letter #218
ES-4020 Series Alternator Parts Supersedure: Affects ES-4020 Series alternators being overhauled or serviced by Hartzell Engine Tech LLC (HET) or other authorized repair stations.
May 25, 2023
Service Bulletin #096
Alternator Bearing Retainer Replacement:  Affects alternator P/Ns ALT-9522, ALV-9610, ALX-9524, ES-6024D, & ES-10024 shipped by Hartzell Engine Tech LLC between 10/25/2022 and 11/29/2022.

 

March 21, 2023
Alert Service Bulletin #097
Alternator Mounting Flange Inspection:  Affects 15-1010 and 15-1014 series alternators manufactured by Hartzell Engine Tech and shipped between 01/01/2019 and 01/01/2023.
February 15, 2023
Alert Service Bulletin #086 Rev. A
Alternator Drive-End Bearing Replacement:  Affects all alternators overhauled with drive-end bearing P/N 646492AC between 17 Feb. 2020 and 26 Mar. 2021. Bearing is part of kit P/N 646492A1AC.  
May 25, 2022
Service Bulletin #090 Rev. A
Alternator Thru-Bolt Inspection:  Affects alternator P/Ns ASG10001-13, DOFF10300JR, DOFF10300BR, ASG10001-17, ASG10001-17R, ES-4000, ES-4009, & ES-4024LP.
September 19, 2019
Alert Service Bulletin #081 Rev. A
Alternator Castellated Hex-Nut Inspection.  Affects Plane-Power alternators P/N ALT-9522(R), ALV-9510(R), ALV-9610, ALX-9524(R), C14-100(S), C28-150(S), ES-6024D, and ES-10024 shipped between 05 January 2011 and 21 May 2019.
May 7, 2019
Alert Service Bulletin #078
Alternator Inspection:  Plane-Power Alternators P/N ES10024 (Continental Aerospace Technologies (CAT) P/N 656802) manufactured by Hartzell Engine Technologies are affected by this Alert Service Bulletin.  
April 17, 2019
Service Bulletin #075 Rev. A
Alternator Drive Coupling Inspection - FOD prevention Drive coupling inspection on Jasco series alternator models 6555(T, C), 6565(T, C), 7555(T, C), 7565(T, C), and 7655(T, C) including those produced by Skytronics Inc.  
March 24, 2019
Service Bulletin # 077
Alternator nameplate inspection Overview: (6) ES-4001 Plane Power Alternators manufactured by Hartzell Engine Technologies affected by the Service Bulletin
August 28, 2017
Service Bulletin #068 Rev. 1

Jasco Alternator Wire Harness – Wire Chafing Protection or Replacement

Affects Jasco alternator models 6555T, 6565T, 7555T, 7565T, and 7655T produced prior to April, 2016 (serial numbers before H-Q041825) including those produced by Skytronics.

March 2, 2017
Service Bulletin #070

Alternator Model ALV-9510R – Rotor Shaft O-Ring and Spacer Replacement

Affects all ALV-9510R Alternators overhauled or repaired with p/n ALV-0210 Spacer or 90-2822 Service Kit delivered between Sept. 20, 2006 and Dec. 7, 2016.

September 15, 2016
Service Bulletin #066

Gear Driven Alternator Rotor Replacement – HET Models ALX-9522, ALX-9524, & ALT-9522

Affects certain serial number alternators containing suspect rotors with date codes between 35 14 and 18 16.

August 11, 2015
Service Bulletin #064

Alternator Model ALV-9610 Series – Through Bolt Inspection for Proper Torque.

Affects P/N ALV-9610 Alternators with serial numbers prior to H-P060614.

July 13, 2015
Service Bulletin #063

Alternator Models ALT Belt & ALX Gear Series. HET P/N ALA-0020G Through Bolt Replacement.

Affects certain serial number P/N ALT-8520, ALX-9524R, and ALX-9525BR Alternators installed on Continental engines.

May 28, 2015
Service Bulletin #062

Alternator Models ALU, ALX, & ALY Series.  HET P/N ALA-0020G Through Bolt Replacement.

Affects certain serial number P/N ALU-6526, ALU-8521LS, ALU-8521R, ALU-8521-9, ALU-8532LS, ALX-8521LS, ALX-8521LS-1, ALX-8521-9, and ALY-6521R Alternators installed on Lycoming engines.

April 15, 2015
Service Bulletin #061

Alternator Model ALU-6539-4 Installation of Missing Spacer.

Affects certain serial number P/N ALU-6539-4 Alternators (Piper P/N 680-516) installed on Piper PA46-350P Mirage and PA46-350T Matrix aircraft.

April 7, 2015
Service Letter #054

Alternator – Spare Parts Release JASCO Type HET Alternators

Announces FAA-PMA approval of various JASCO type alternator part numbers for several aircraft applications.

February 23, 2015
Service Letter #053

Alternator – Spare Parts Release HET P/N ES-10024B-2

Announces FAA-PMA approval of HET P/N ES-10024B-2 Alternator on Found Aircraft FBA-2C3 Expedition E350.

July 7, 2014
Service Information Letter A-140 Rev. 1

Gear Driven Alternator Shipping Hardware.

April 7, 2014
Service Bulletin #059

Alternator Inspection for Burrs in the Rotor Shaft Hex Key Socket.

Affects P/N ES-10024, ALX-9524, ALX-9524R, ALV-9610 Alternators with specified serial numbers.

December 9, 2013
Service Letter #052

Alternator – Spare Parts Release.  HET P/N ALU-6539-3 & ALU-6539-4.

PMA approval to replace Lycoming P/N 32C22527, 32C22528, 32C22515 Alternators.

November 8, 2013
Service Letter #051

Alternator Spare Parts Release HET P/N ES-4024LP-( ).

PMA Approval for ES-4024LP, ES-4024LP-2, ES-4024LP-3.

October 15, 2013
Service Letter #050

Alternator Spare Parts Release HET P/N ES-10024B-6.

PMA approval for ES10024B-6 alternator on Piper PA44-180 Seminole.

September 26, 2013
Service Bulletin #054

Alternator P/N ES-13070-1 Fan Replacement.

Affects P/N ES-13070-1 Alternators with specified serial numbers.

July 16, 2013
Service Bulletin #053

Alternator HET P/N ASG12000 (-1, -2, & -3) Housing Gap Check.

Affects Cessna P/N 9910592-(1, 2, 3)(RX) with specified serial numbers.

November 7, 2011
Service Bulletin #044

Alternator Recall for Installation of Improper Wave Retainer. 

Affects ALX-9525B and ALX-9525BR with specified serial numbers.

September 24, 2009
Service Bulletin #038 Rev. A

ES10024-1 (TCM P/N 656802) Alternator Slip Ring End Housing Cracks.

Affects P/N ES10024-1 with specified serial numbers.

July 11, 2008
Service Bulletin #033

ES7024-11 (TCM P/N 656872), ES7024-14 (TCM P/N 657199) Alternator Fan and Pulley Replacement.

Affects Cirrus SR22 with certain serial number alternators.

February 6, 2008
Service Information Letter #A-125 Rev. A
ES-6000 and ES-7000 Series Alternator Terminal Connection Instructions.