Ps-855b Maintenance Manual -

The PS-855B is a high-capacity variant within the PS-850/855 series, featuring lead-acid battery technology designed for harsh aeronautical environments. 28 VDC, 15 Amps maximum.

The PS-855B uses a thermal compound between the pass transistors and the heatsink. This compound dries out after 7-10 years. The manual specifies that during any major service, you must remove old compound and apply fresh silicone-based thermal paste to prevent thermal runaway. ps-855b maintenance manual

: For increased accessibility, this test can often be performed remotely from the cockpit or directly at the unit. Other Notable Manual Features The PS-855B is a high-capacity variant within the

: Available for purchase or download at Essco Aircraft or eFlightManuals . This compound dries out after 7-10 years

The PS-850/PS-855 Component Maintenance Manual (TP-483) is the official technical guide for qualified personnel to install, repair, and maintain the unit.

Unit powers on, displays voltage, but under a 1A load, the voltage drops to 50% of the set value.

Hosts digital versions of the maintenance manual and component manuals.