Frequently Asked Questions
We have assembled a list of frequently asked questions about starters and supporting tech. Whether it’s about part numbers or settings, you’ll find the most popular questions and answers below. If you don’t see your question, please contact our product support department.
The part number for the shear pin used on the NL series starters is part number ST4301.
Please see the product line home page, select “Support” and then “Warranty”.
Please see the product line home page, select “Support” and then “Warranty”.
If parts and/or labor are approved under the commercial portion of the ASB or SB, complete the claim form at the end of the bulletin and return to the physical or email address provided in the ASB or SB.
Within 12 months from date of invoice, any unit returned for core shall be as removed from the aircraft, be complete and not disassembled. The core must be identified with an original data tag. Missing data tags or original ink-stamped identification will not be accepted. A percentage of the core value will be charged for all missing or damaged parts.
Any product returned for warranty consideration shall be as removed from the aircraft, be complete and not disassembled. All external parts including, but not limited to, brackets, fittings, bafflings, etc. shall be removed prior to shipment as they will not be returned.
Go to the hartzell.aero website and select Videos under the Resources heading.
Please see the following link for application information.
https://skytec.aero/starter-adapters/
An “Old”, “Classic” or “Traditional” style has a steel sleeve around the spring. A “New” style adaptor will not have a steel sleeve around the spring.
“Old” style adaptors will have one snap ring in the starter flange bore, a “New” style adaptor will have two snap rings in the starter mounting flange bore.
Continental Aerospace Technologies has published numerous service docs in the past relating to adaptor assemblies.
CSB02-2C STARTER ADAPTER SHAFT SEAL INSPECTION
http://www.tcmlink.com/pdf2/CSB02-2C.pdf
M70-7 INCREASING SIZE OF OIL FEED HOLES TO STARTER ADAPTER SHAFTGEAR
http://www.tcmlink.com/pdf2/M70-7.pdf
M71-20 INSTALLATION INSTRUCTIONS FOR THE COMPRESSOR SHEAVE TO THE STARTER ADAPTER (637778)
http://www.tcmlink.com/pdf2/M71-20.pdf
M79-12 STARTER ADAPTER SHEAVE
http://www.tcmlink.com/pdf2/M79-12.pdf
M87-24 BROKEN STARTER ADAPTER SHAFTS
http://www.tcmlink.com/pdf2/M87-24.pdf
M88-5 STARTER ADAPTER SHAFTS (REFERENCE SERVICE BULLETIN M87-24)
http://www.tcmlink.com/pdf2/M88-5.pdf
M92-10 STARTER ADAPTER
http://www.tcmlink.com/pdf2/M92-10.pdf
MSB11-4B STARTER ADAPTER SHAFT GEARS
http://www.tcmlink.com/pdf2/MSB11-4B.pdf
MSB94-4H STARTER ADAPTER SHAFTGEAR AND CRANKSHAFT GEAR INSPECTION
http://www.tcmlink.com/pdf2/MSB94-4H.pdf
SB01-5 STARTER ADAPTER BEVEL GEAR INSPECTION
http://www.tcmlink.com/pdf2/SB01-5.pdf
SIL97-12 INSTALLATION OF STARTER ADAPTER SHAFT SEAL AND ASSOCIATED PARTS
http://www.tcmlink.com/pdf2/SIL97-12.pdf
Yes and it is available as a free download from the skytec.aero website at the following link. https://skytec.aero/wp-content/uploads/2020/08/ST1001-Rev.-New.pdf
This depends on the starter part number. Legacy Prestolite, mechanical Bendix drive starters can be overhauled using the current OE-A2 Electrical manual. Legacy Sky-Tec starters have no overhaul available but they are available as new, exchange. In today’s maintenance environment, it is often better to exchange with new as opposed to overhaul of old components for several reasons:
- Manufacturing processes have become much more efficient which allows a new starter to be manufactured faster and at less cost than overhaul of an old unit IF the old unit is overhauled in accordance with typical recommended processes.
- Warranty of new product is 2 or 3 years (depending on model) or 1000 hours’ time-in service, whichever occurs first. A typical overhaul warranty consideration period is 6 months or 250 hours, whichever occurs first.
- For the mechanic, a new, exchange purchased product shifts the product liability from the mechanic performing the repair/overhaul to the manufacturer.
There are two current draws to consider; in-rush current, which is the amount of current needed to initially turn the engine over and continuous current which is the amount of current required to maintain engine rotation. Starter current draw is based on several physical and electrical system factors but we typically use 190 amps as an in-rush current and 65-90 amps as a continuous current.
A high-torque starter sacrifices longer, more sustained power at a lower torque (think mechanical Bendix drive starters) so that a short burst of high-torque power can be supplied. In addition, strong, powerful, offset gear-reduced starter motors deliver cranking torque through a set of internal gears. Lightweight, compact and durable HT designs start the engine faster with immense power, while drawing less current from the battery. Since a high-torque starter is working so much easier to turn over the engine, it can seem as though the cranking speed is actually faster, and in some cases depending on the gearing, it is.
The original High-Torque HT starter is where it all started with Sky-Tec. Now with internal, self-resetting kickback protection. High Efficiency Wound Field Motors. HT starters are ideally suited for piston helicopters and workhorse operations requiring a rugged design, maximum reliability & service life. Designed to spin the prop twice as fast during start. Environmentally sealed case. Rugged all metal gears. All steel ball bearings. Heavy-duty drive.
All legacy Sky-Tec starters are “high-torque” by definition when compared to the original Bendix drive starters. Whether wound field coil or permanent magnet motors, faster “spin” = easier engine starts, better hot start engine performance and less chance of engine kickback.
