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The (formally identified as Component Maintenance Manual TP-483 ) is the primary technical document used for the installation, operation, and servicing of the L3Harris (formerly JET or B.F. Goodrich) PS-855B Emergency Power Supply. This self-contained unit is critical for aviation safety, providing backup power to essential flight instruments like attitude gyros and standby indicators during a total aircraft electrical failure. Core Technical Specifications
According to the Maintenance Guide, batteries should undergo a physical condition and functional check every 3 to 6 months . ps-855b maintenance manual
: This is the most current version of TP-483 for both PS-850 and PS-855 models. Service Letter SL-170 (Rev. K) ps-855b maintenance manual
Regular upkeep is mandatory to ensure the unit's lead-acid batteries remain functional. ps-855b maintenance manual