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The PS-855B (and its predecessor, the PS-850) is an aircraft Emergency Power Supply (EPS) manufactured by L3Harris (formerly JET or Goodrich). Maintenance procedures for this unit are strictly governed by specific technical publications. Primary Manuals and Documents
To "put together" the necessary paperwork for this unit, you typically need the following documents:
Maintenance Manual (TP-483): This is the primary reference. It provides detailed instructions for repair, testing, and troubleshooting.
Battery Maintenance Guide (SL-170): A critical supplement that focuses specifically on the battery cells. It covers storage, outgassing, and periodic capacity checks.
Installation and Operation Manual (24-30-07): Essential for initial setup and verifying the unit's interface with the aircraft's electrical system. Key Maintenance Requirements
The manual specifies a rigorous schedule to ensure the unit functions during an emergency: ps-855b maintenance manual
Periodic Checks (Every 3 to 6 Months): Required to verify the physical condition of the batteries and their basic charge status.
Annual Capacity Checks: A mandatory test to ensure the battery can still provide the required power for the specified duration.
Charging Procedures: Instructions for recharging the unit using recommended equipment like test panels and load resistors.
Storage Guidelines: If the unit is removed for storage, the battery must be maintained according to specific outgassing and temperature protocols to prevent degradation. Where to Source These Documents You can obtain official copies from these sources:
L3Harris Avionics Support: The current manufacturer and source for authorized service literature and technical updates. The PS-855B (and its predecessor, the PS-850) is
Scribd (TP-483 Archive): Hosts digital versions of the maintenance manual and component manuals.
Essco Aircraft: Sells printed or digital copies of the B.F. Goodrich version (TP-483).
Do you need specific wiring diagrams or a list of required test equipment for the annual capacity check? TP 483 - PS 850 PS 855 - Rev.B | PDF | Electricity - Scribd
Grand Rapids, MI 49512-9704, USA July 30, 2014. [Link] Foreword. This manual provides information intended for use by persons who, PS-850/PS-855 Component Manual | PDF - Scribd PS-850/PS-855 Component Manual | PDF. 4K views230 pages. PS-850/855 Battery Maintenance Guide | PDF - Scribd
Disclaimer: The specific "PS-855B" model number is commonly associated with a Pressure Switch (often manufactured by SOR, Danfoss, or used in HVAC/Industrial applications). However, part numbers can overlap across different industries. Step 2: Where to Search for the Manual
The following document is a Draft Maintenance Manual Template prepared for a generic industrial PS-855B Pressure Switch. If your device is a different type of equipment (e.g., a power supply, hydraulic pump, or audio component), please provide more details so the specifications can be adjusted.
Do not search just "PS-855B maintenance manual". Use targeted searches.
When the flowcharts lead to a dead end, you must read the manual like a detective.
If an original component is obsolete (e.g., Fairchild KA3842 PWM), the manual may list direct substitutes (e.g., TI UC3842). Always check the “Alternative Parts” addendum.
Critical for ordering replacements. The manual will list: