Maintenance Manual [portable] | Ps-855b

Turn the current knob slowly clockwise until the DMM reads exactly

This is the primary reference. It provides detailed instructions for repair, testing, and troubleshooting.

According to the SEAEROSPACE.COM product guide , the PS-855B requires specific periodic checks to ensure the lead-acid cells remain airworthy. ps-855b maintenance manual

Ideal storage is below 29°C (85°F) to minimize self-discharge. Specification Input Power 28 VDC, 15 Amps max Output Voltage 24-28 VDC (Main) and 5 VDC (Converter) Battery Type Sealed Lead Acid (5.0 Amp/Hour for B model) Weight 13.7 lbs max Standard Manual TP-483 (Component Maintenance Manual) Procuring the Manual and Parts PS-850/PS-855 Component Manual | PDF - Scribd

Keep below 80% relative humidity, non-condensing, to avoid internal corrosion on copper traces and terminal contacts. Turn the current knob slowly clockwise until the

The PS-855B (P/N 501-1712-02) lead-acid emergency power supply, manufactured by L3Harris/Avionics Systems, requires regular maintenance guided by CMM TP-483 and Service Letter SL-170, including visual checks for outgassing and annual capacity tests. Essential procedures involve a 5-second push-to-test for capacity, a 7.0-ohm load test for 48 minutes, and specific 8 to 23-hour recharging requirements to ensure continued airworthiness. For detailed procedures, refer to the L3Harris CMM TP-483 documentation at seaerospace.com Southeast Aerospace Inc. L3Harris PS-855B | SEAEROSPACE.COM

Even experienced techs make errors. Here is what the manual explicitly warns against. Ideal storage is below 29°C (85°F) to minimize

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