Ps-855b Maintenance | Manual Fixed

A simple cockpit test to ensure the "In-Use" or "Battery" lights trigger correctly.

Maintaining high accuracy requires periodic hardware inspection and voltage calibration. Electrolytic Capacitors

The , designed by L-3 Communications Avionics Systems (formerly B.F. Goodrich), is a critical component in aircraft safety, providing reliable backup power to flight instruments. Ensuring its operational readiness requires adherence to a strict maintenance schedule, outlined in technical manuals such as the TP-483.

Working with industrial power systems introduces high-voltage risks. Always strictly adhere to the following safety protocols before removing the chassis cover. Critical Safety Rules ps-855b maintenance manual

The is a self-contained emergency power supply designed primarily for aircraft to provide critical standby power to attitude gyros and essential flight instruments in the event of a total electrical failure. Manufactured by L-3 Communications (now L3Harris) and supported by Extant Aerospace , this unit relies on sealed lead-acid batteries and requires strict adherence to its Component Maintenance Manual (CMM TP-483) to ensure flight safety. Core Maintenance Requirements

A formal discharge test performed under load to confirm the unit can meet its required emergency duration. For the PS-855B, the output voltage must remain above 20 VDC after a 48-minute discharge period when using a 7.0-ohm load.

Check and re-torque all internal power terminal connections to the specified manufacturer torque limits. A simple cockpit test to ensure the "In-Use"

The PS-855B is not a "fit-and-forget" component. It contains internal batteries, sophisticated electronics, and performs automatic self-tests to ensure it is ready for an emergency. The official maintenance manual is the single source of truth for all personnel involved in its care.

Wear ANSI-approved safety glasses and use rated ESD (Electrostatic Discharge) grounding wrist straps to protect sensitive logic control boards. 2. Schedule of Preventative Maintenance

Essential for monitoring voltage across specific pins (J1-11 and J1-7) during testing. Goodrich), is a critical component in aircraft safety,

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

The L3Harris PS-855B is a sophisticated piece of safety equipment, and its maintenance manual is an indispensable tool for ensuring it will perform flawlessly in an emergency. This guide has provided a comprehensive overview of the unit's critical features, technical specifications, and the crucial information contained within the manual.

The PS-855B Maintenance Manual emphasizes the importance of safety precautions and considerations during maintenance, troubleshooting, and repair. The manual provides guidelines on:

Clean the adjustment potentiometer with electrical contact cleaner. Over-temperature fault

In the world of industrial power supplies and electronic test equipment, the model number carries a reputation for reliability. Whether you are managing a broadcast facility, a medical research lab, or a high-end audio production studio, the PS-855B is a workhorse. However, like any precision electronic device, its lifespan depends entirely on one thing: proper maintenance .