The D B Assembly, Inc. Aircraft power supply and battery charger "APU" series offers a selectable power supply or battery charger mode. You can select the output voltage with the flip of a switch on the front panel to either 14 or 28 VDC. You can also select what you want to use the unit for, charging the batteries or a power supply mode by the flip of a switch.
The B-14/2850 plugs directly into the aircraft APU connector and is tied to the electrical system when the master switch is activated. Selection of output voltage is by a front panel switch which is protected by a switch guard. Closing the guard forces the switch to the 14 volt position.
The D B Assembly, Inc B-14/2850 Aircraft Ramp Power Supply and Battery Charger is a multi- purpose aircraft flight line service and maintenance tool. The unit has a filtered 14 & 28 volt DC power supply with up to 50 amperes capability for tests of aircraft electrical systems and a secondary mode for recharging run-down batteries.
This ramp or hangar accessory is an absolute must for avionics service, gear and flap actuator exercising and other electrical system service. The battery charging mode is selectable by a front panel switch. The charging process is fully automatic. When the charge is in progress a red LED is illuminated. This is replaced by a green LED when the aircraft battery is fully charged. The on/off switch on the unit also resets the unit.