A standout feature of the PS-855B Emergency Power Supply maintenance manual is its detailed annual capacity testing procedure, which ensures the unit can still support essential flight instruments during a total power failure. Key Maintenance Feature: Annual Capacity Test
According to the maintenance guidelines (specifically Service Letter SL-170), this feature allows technicians to verify battery health through a standard "Push To Test" function:
Built-in Load Test: The unit performs a self-test under load for 5 seconds when the "Push To Test" button is held. This confirms if the battery capacity is above or below 50%.
Automated Results: A dedicated LED illuminates if the capacity is sufficient (>50%). If it fails to stay lit for the full 5 seconds, the manual specifies an extended 16-hour recharging requirement instead of the standard 8 hours.
Remote Capability: For increased accessibility, this test can often be performed remotely from the cockpit or directly at the unit. Other Notable Manual Features ps-855b maintenance manual
The manual for the PS-855B (often identified as TP-483) also covers:
Periodic 3–6 Month Checks: Required intervals to ensure continued airworthiness, similar to a preflight inspection.
Automatic Charge Management: Instructions on how the unit automatically maintains full charge during normal flight, reaching 50% capacity within just one hour of operation.
Safety Inhibits: Details on how battery heaters are automatically inhibited during low input voltage to prevent accidental discharge. A standout feature of the PS-855B Emergency Power
You can find official documentation or request a physical copy through vendors like ESSCO Aircraft or Duncan Aviation. JET PS-855B 501-1712-02 | Duncan Aviation
Physical copies of vintage maintenance manuals frequently surface on eBay. Search for "PS-855B service manual original." The benefit of a physical manual is the large fold-out schematics.
If the brand is known, email their technical support. Provide:
The PS-855B maintenance manual is not the same as a user manual. Look for: Full label photo Device dimensions and connector pinout
Document Number: MM-PS855B-001 Revision: A Date: October 26, 2023
Based on service logs from repair shops, the PS-855B exhibits several age-related failures. The maintenance manual provides specific remedies.
Most original equipment manufacturers (OEMs) maintain an FTP or support site for discontinued products. Search for the brand name (e.g., "Brand X PS-855B support"). Look for a section labeled "Service Manuals" or "Technical Documentation."