FAA-PMA APPROVED for Certified AircraftContinuous Duty (Battery/Master Solenoid). Available in 12V and 24V. Activation: -(Ground) to S-Terminal. (Floating ground frame).
All stock meets Service Bulletin 72.
Exact fit and replacement for my old one. Works perfectly so far.
Product came as Advertised. As always I never had any problems with the great service Aircraft Spruce provides. Thanks
so far so good
Good fit. Solid construction. No more jiggling battery leads to get relay to engage.
to replace an original equipment solenoid in my OLD Mooney, this is the only game in town (and at a reasonable price too). it fit just fine and operates exactly as expected. as usual, no complaints with anything from Aircraft Spruce.
This product fit in the mount and to this point accomplishes the intended task at a fraction of the OEM part.
Good Part- standard replacement.
We installed them on 3 of the Cessnas in our rental fleet. Had problems with one of them dropping out in flight. Complied with the service bulletin and Hartzell sent 3 new units. One of the new units in a Cessna 150 failed ON after about 60 hrs. We were able to bring a flat battery back. Hartzell replaced the unit for free. The replacement unit has now also failed ON after 45 hrs.
This is a replacement for an identical master solenoid (STS-M12) that was in operation for less than 6 months. The previous solenoid would make a loud click when I turn it on but would not make contact across the primary voltage wires. This would happen intermittently. I inspected all connections and battery - which were all like new. The description states the Silver Contacts provide 300A in-rush & 150A continuous-duty capability Much higher than OE units. I removed the cap on the solenoid and did not see any silver contacts - They are copper contacts. I would like to have an explanation of what do they consider silver contacts. I certainly did not find silver inside. Very disappointing.
The total current draw is 0.8 amps.
The STS-M12 is for the battery master. The STS-a12 is for Auxiliary master, like a GPU.
The coil terminals are #10's and the power terminals are 5/16ths. It is recommended to mount per the airframe specifications. If none, it is recommended to mount with the cap up.
Per Vendor: This product does not include the diode. You do not need the diode for the part to work correctly, it is simply a safety precaution some like to take. The airframe manufacturer might have a diode they recommend.
12 mo from date of installation of product or 500 hrs - whichever comes first. Log books are required for warranty