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Ps-855b Maintenance Manual [repack] Jun 2026
Verify hydraulic oil levels and ensure they are within the acceptable range.
Understanding core parameters is required before performing any bench procedures. The PS-855B differs from other variants (such as the PS-855A or C) primarily through its double-capacity battery pack configuration. Specification Details 501-1712-02 Input Voltage / Current +28.0 VDC nominal // 15 Amperes maximum Main Battery Output 24 to 28 VDC nominal (10A Steady State, 15A Overload) Auxiliary Output Adjustable 5 VDC Converter (+2.5 to 5.5 VDC, 25 Watts) Battery Chemistry & Capacity Sealed Lead Acid (SLA); 5.0 Amp-Hour rating Unit Weight 13.7 lbs maximum (Heavier than A, C, or D models) Environmental Standards Qualified to RTCA/DO-160C environmental profiles Required Maintenance Intervals PS-850/PS-855 Component Manual | PDF - Scribd
: The manual lists required adhesives, tapes, and protective coatings for internal repairs. Core Specifications for Maintenance PS-855B Specification Input Power 28 VDC, 15 Amps Output Voltage 24 to 28 VDC (Emergency) & 5 VDC (Converter) Battery Capacity 5.0 Amp/Hour (higher than the 2.5 Ah on A/C models) Weight 13.7 lbs max Service Life Unrestricted, provided periodic checks are passed
. This manual covers both the PS-850 and PS-855 series under ATA Chapter 24-30-08 🛠️ Key Maintenance Intervals According to L3 Service Letter SL-170 , maintenance is divided into two primary categories: Periodic Check: Required every 3 to 6 months to verify battery health and readiness. Capacitance Check: Usually performed every
The unit is designed for . In normal flight, it automatically maintains the batteries at full charge. The manual will specify charging rates and profiles, noting its capability to recharge to 50% capacity within one hour at 25°C . The PS-855B is equipped with automatic battery heaters with redundant control for safety to ensure operation in extreme cold. However, these heaters are inhibited during low input voltage to prevent the unit from draining the aircraft's main battery. ps-855b maintenance manual
Note: The PS-855B is typically a "Range Adjustable" device. Adjustments should be made during system startup.
Check the DMM reading. If it does not read 10.00V , locate the internal voltage calibration trim pot (typically labeled or VR1 on the display control PCB).
This is the most crucial maintenance step. It involves a timed discharge to ensure the battery can sustain the rated load for the required duration (usually 30 or 60 minutes, depending on the aircraft's certification).
, officially designated as under ATA Chapter 24-30-08 , provides authorized technician instructions for the Verify hydraulic oil levels and ensure they are
Locate the internal current calibration trim pot (labeled or VR2 ).
Verify that the cooling fans are spinning; clear obstructed airways. Over-current protection trip
Store the unit in a clean, dry, climate-controlled room with a relative humidity level below 60% (non-condensing).
Proper techniques to open and service the unit. Capacitance Check: Usually performed every The unit is
If you need the manual urgently, services like or ManualsOnline charge a small fee ($9–$15) for an immediate PDF download. Proceed with caution—check reviews to ensure the PDF is not a generic manual mislabeled for the PS-855B.
Lint-free microfiber cloths and isopropyl alcohol (99% purity) Replacement seal kit (Part # PS-855B-SK) 2. Preventive Maintenance Schedule
on document sharing sites like Scribd.