Passenger Stairway PS-813B/E Boeing | 12
SECTION 1 - PROCEDURES, SPECS & CAPABILITIES
has a 10–micron replaceable canister. It is located at the front of the
hydraulic tank.
1.1.4 | Electrical System
The electrical system is a 12 VDC system used for illuminating the stairway
and powering the stairway engine electrical starter. Major electrical
components are described below. See Figure 1.1.4 for electrical schematic.
COMPONENT DESCRIPTION
Battery Charger
The battery charger is provided for maintaining the
batteries at peak levels. The battery charger has a 15
amp. maximum output and an automatic charging
rate. The charger receives 120 VAC current through a
power cord on the charger.
Batteries
The two 6V marine deep cycle batteries provide
power for the electrical lighting and the engine
electric starter. The batteries are located in plastic
battery boxes. They are kept charged by a battery
charger (located in an adjacent battery box) that has
a rated capacity of 220 amp./hr. at 32˚F.
Fuse
The 30 amp. mini fuse protects the lights circuit from
overloads. The fuse is located inside a plastic fuse
holder near the hydraulic motor.
Circuit Breaker
A 80 amp. re-settable circuit breaker protects
the engine start circuit from overloads. It is
located on the chassis frame near the batteries.
Lighting Control
Switch
The LIGHT ON/OFF control switch (toggle) for
the stairway, platform and A-frame lights is
mounted on the primary control station.
Alternator
The engine alternator provides current to the
batteries which keep them from being depleted
during stairway operations. The engine on this
unit is equipped with a heavy duty 18 amp.
alternator and rectier.
1.1.4.1 | Lighting
COMPONENT DESCRIPTION
Stairway Lights
The stairway lights mounted in the upper and lower
stairs side panels illuminate the stairway during
night operations.
Platform Lights
The two platform lights faired into the front of the
platform illuminate the platform during nighttime
operations.
NOTE:
Electrical power for the stair-
way is provided by two 6 V
deep cycle batteries, which are
kept charged by a battery char-
ger. The charger operates when
plugged into an external 120
VAC power source. When the
engine is running, the engine
alternator helps keep the bat-
teries from becoming depleted.
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