Service Documents

Service bulletins, alert service bulletins, and service letters are issued periodically to communicate important product service information. Always ensure you are working from the most current revision of any service document before performing inspections or maintenance. Failure to use current information may create an unsafe condition. If you have questions about a specific document or cannot locate the service information you need, contact our teamfor assistance.

Aircraft Accessory Service Documents

Service Document Name	Date	Content	Category Name	Service Document PDF	hf:tax:service_docs_cat
Service Bulletin #211 Rev. A	March 13, 2025	Aircraft Starter Power-Lead Inspection. Affects Skytec starter P/N 149NL/EC manufactured by Hartzell Engine Tech LLC (HET) and installed onto aircraft engines containing a top-mounted 90° fuel-injection-servo fitting.	Aircraft Starters		aircraft-starters
Service Letter #091	April 22, 2022	149NL/EC Kickback Protection: Contains service information to inspect and correct, if desired, affected aircraft starter assemblies that may not provide kickback protection.	Aircraft Starters		aircraft-starters
Service Letter #080	July 19, 2019	122NL, 149NL, and 149NLR Series Starter Voltage Application. Affects starters that can be configured as either 12v or 24v, switchable.	Aircraft Starters		aircraft-starters
Alert Service Bulletin #072 rev. A	January 25, 2018	Master Contactor Replacement. Affects Sky-Tec Master Contactors p/n’s STS-M12 and STS-M24 and Auxiliary Contactors when used as a Master, p/n’s STS-A12 and STS-A24. Requires replacement with an unaffected contactor.	Aircraft Starters		aircraft-starters
Service Letter #047	October 23, 2013	Commutator End Bearing Supersedure PM Series Starters. Affects P/N PMxxxx Series Starters. P/N 6101001 Commutator End Bearing superseded by P/N X-4130 Commutator End Bearing.	Aircraft Starters		aircraft-starters
Service Bulletin #043	November 2, 2011	X-Drive Starter Fit. Affects use of P/N SRB-9021 Starter on VulcanAir / Partenavia P68 Series aircraft.	Aircraft Starters		aircraft-starters
Service Information Letter #A-132	March 12, 2009	Hartzell Engine Technologies Starter Installation And Duty Cycle Requirements. Affects E-Drive and X-Drive series starters.	Aircraft Starters		aircraft-starters
Service Information Letter #A-126	November 16, 2007	Kelly Aerospace, Inc. Starter Eligibility Listing.	Aircraft Starters		aircraft-starters