The Plane Power AL24-P70 FAA-PMA approved Alternator is a direct replacement for Prestolite
24/28 volt, 70 amp Alternators typically installed on Beechcraft, Grumman, Mooney and Vulcanair, S.P.A. Airplanes fitted with Lycoming Engines. The Plane-Power AL24-P70 should be consider as a direct replacement for the following: Beechcraft Part Number: ALU-8421Beechcraft Part Number: ALU-8421RGrumman (Gulfstream, Tiger) Number: ALU8421LSMooney Part Number: Mooney Part Number: ALU6421LSMooney Part Number: ES-4009LSVulcanair, S.P.A. Part Number: ALU-8421LSPlease use the "Application" to see if your planes model is listed. The Plane-Power AL24-P70 is FAA-PMA approved for installation on the following: Beechcraft B19, C19, C24R76 Duchess77SkipperGrumman (Gulfstream, Tiger)AG-5B Mooney M20J, M20MVulcanair, S.P.A. P68, P68B, P68C, P68C-TC, P68 "OBSERVER", P68TC "OBSERVER", P68 "OBSERVER 2"Lycoming Engine series 235, 320, 360, 540, 720 Replacement for 24v 70 amp (or less) Lycoming alternatorsOverall Rating for Plane-Power AL24-P70 FAA-PMA 12V 70 Amps AlternatorInstallation Instructions- Disconnect aircraft battery.
- Install alternator per included drawing.
- Refer to appropriate engine and airframe service manuals for belt tension and bolt torques.
- Install battery wire with MS25171-2S terminal nipple on 6mm output terminal and torque to 50 in. lb.
- Install ground wire to any of the three 5mm studs on rear of alternator and torque to 35 in. lb.
- Install field wire with MS25171-1S terminal nipple to F1 terminal on rear of alternator and torque to 20 in. lb.
- NOTE: F2 terminal to remain grounded with ground strap UNLESS aircraft voltage regulator is a type "A" regulator using a 2-wire field circuit, in this case remove and discard ground strap from F2 terminal and connect wiring from voltage regulator to F1 and F2 terminals, torque to 20 in. lb.
- If aircraft is equipped with an "alternator out light" circuit, connect that wire to the AUX terminal and torque to 20 in. lbs. Other wise leave AUX terminal open.
- Reconnect aircraft battery.
- Start aircraft and check alternator output for proper operation.
Instructions For Continued AirworthinessAnnual / 100 hour inspections
- Remove drive belt and turn alternator rotor to check condition of bearings for abnormal noise or roughness.
5 year or 1,000 hour intervals
- Repeat: Annual / 100 hour inspection.
- Remove field brush assembly and inspect brushes for excess wear. Replace brush assembly if brushes extend less than .250" from edge of brush holder case.
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