We have assembled a list of frequently asked questions about alternators 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 C28-150 and the C28-150FR are the same in fit, form and function. The FR (factory rebuilt) designation was required BY a manufacturing process when the product line was originally purchased. That process is no longer required so the FR designation was dropped.

The ALE-1013AS brush is perfectly square and is used with the ALU or ALE-3045BS brush holder. The ALE-2013AS brush is slightly rectangular and is used with the ALU or ALE 2045BS brush holder. The brushes are not interchangeable.

The R1224 and the R1224B voltage regulators are the same electrically. The only difference is the size of the base.

There are no manuals approved on the ASG/991 series alternators as there are no repairs or field overhauls approved. These alternators are considered “on-condition” until they are no longer serviceable.

The Plane Power warning light is a 100 milliamp bulb. If an incorrect bulb is used, the light may not come on or it may “glow in the dark”.

The front seal used on most of the gear drive, Permold style alternators is part number XA-1026.

The brush block assembly used in the Plane Power AL12 and AL24 series alternators is part number 10-1020.

The brush block/regulator assembly used in the Plane Power C14-50, EX14-50 and AL12-EI60 alternator is part number 11-1043.

The brush block assembly used in the Plane Power ER14-50 alternator is part number 11-1013.

The brush block/regulator assembly used in the AL12-RI70 Plane Power alternator is part number 99-1042.

The brush block assembly used in the Plane Power ALT-FLX, C14-100 or C28-150 alternators is part number 15-5005.

The enable harness for the AL12-EI60 and ER14-50 Plane Power alternators is part number 11-1010.

The enable harness assembly for the Plane Power AL12-EI70/B alternator is part number 99-5097.

The Plane Power AL12-EI60 series alternator regulator is factory set to 14.2+/- .3 volts.

Wide deck engines will always have letter at the end of the serial number. Narrow deck engines will not.

The 14-1010 14 volt Plane Power lamp has yellow leads. The Plane Power 14-1011 24 volt lamp has purple leads.

R1224 voltage regulator wiring diagrams can be found in the Installation Manuals under the Support drop down on the planepower.aero website.

The RH24-70 alternator is a proprietary unit manufactured exclusively for Robinson Helicopters. As such, you will need to contact them regarding recommended service (ICA) and TBO.

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.