Sells printed or digital copies of the B.F. Goodrich version (TP-483).
If you must repair the unit without a manual:
Provides 5 VDC output for critical standby electronics.
Tools like the Shockboxes BFG Test Box allow maintenance shops to perform load tests and charging functions in-house. ps-855b maintenance manual
A critical supplement that focuses specifically on the battery cells. It covers storage, outgassing, and periodic capacity checks.
. This safety-critical unit delivers immediate backup energy to aircraft instruments. It keeps self-contained attitude gyros active if the main electrical systems fail.
Clean the intake fan filters using low-pressure compressed air (maximum 30 PSI). Sells printed or digital copies of the B
Check external load for short circuits or excessive current draw. Loose transformer laminations Tighten the primary transformer mounting bolts securely. 5. Storage and Environmental Tolerances
This section provides instructions for adjusting and aligning the PS-855B:
This manually operated test unit is designed specifically for the PS-835, PS-850, and PS-855 series. It allows a technician to: Tools like the Shockboxes BFG Test Box allow
Proper service often requires specialized equipment as outlined in the PS-850/855 Battery Maintenance Guide .
If you succeed in repairing or maintaining the PS-855B, document:
Visually inspect large electrolytic capacitors for bulging tops or leaked crust. Measure capacitance and ESR value; replace if out of spec. Faulty current control circuit or open driver transistor.