+$200 Core Exchange Charge
Part# 08-07130
MFR Model# ALX-8521
Hartzell Part No.Volt/AmpDriveReplacesPN


We carry the full line of alternators, generators, and starters which are re-manufactured by Hartzell Engine Technologies for installation in general aviation aircraft. Fully FAA approved. All prices shown are exchange prices. Core charges are billed when unit is shipped. Core credit is issued upon return of acceptable like model core to us.

Attention: These charts are for reference only. Check owners manual or current part installed to verify the model required prior to puchase.
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


The price was fair and the delivery was on time. However, seeing that it’s was Plane Power product when I pulled it out of the box has me a little concerned as we have had issues with their new products in the past. Being that this went on my personal airplane and not a customers I decided to install it anyway to see if quality control has improved since 2017. First three hours of operation went just fine. Time will tell.

James A
December 22, 2019

There was no gasket included. Youd think a new alternator would include one or at least have the courtesy to tell me it needs to be purchased separately. Fortunately I found one on the field but it diminishes the feeling of having a new unit.

Gregory Y
October 22, 2017

I decided to buy two new alternators for my twin during engine change. I thought new has to be better and more reliable than overhauled. One new alternator failed on the first flight. We troubleshot made sure connections and other components were in good order and the alternator failed on the second flight. Not impressed with quality control. Its covered by warranty but not the labor!

Brad G
May 25, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: IS the ALX-8521 LS internally regulated or is there an external voltage regulator that is required?

The AL series Alternators are not internally regulated and do require a voltage regulator.

Q: What is the weight of the ALU-8521

Approx 12.3 lbs.

Q: Does the ALX-9525B alternator come with an installed oil seal?

This does not ship with the drive end oil seal.

Q: Is there are difference in warranty for a new alternator versus an overhauled alternator, ALU-8521 series? And how long is the warranty?

New - 36 months/1000 operating hours
Overhauled - 6 months/250 operating hours

View in Catalog

View Image View in Catalog