Passenger Stairway PS-813B/E Boeing | 10
SECTION 1 - PROCEDURES, SPECS & CAPABILITIES
1.1.2.4 | Platform
The platform is part of the upper stairway and is welded to the upper
stairway side channels. The platform oor is fabricated from diamond
tread plate. Side panels on the platform slide back and forth on rollers
and can be latched in place by means of foot latches. Two platform
lights illuminate the platform during night operations. The front of the
platform has a rubber bumper to protect the aircraft. A 12” extension
and swivel assembly are to help nal positioning and alignment of the
platform to the aircraft.
1.1.2.5 | Stabilizers
This unit is equipped with four stabilizer assemblies at the corners to
stabilize the stairway and to keep it locked in place. The stabilizers are
hydraulic cylinders with stabilizer pads at the bottom that are raised and
lowered hydraulically.
1.1.2.6 | Gasoline Engine
The engine which drives the hydraulic pump is a gasoline engine with an
electric starter. It receives fuel from an integral fuel tank located above
the engine. Engine controls are located on the engine.
1.1.3 | Hydraulic System
The hydraulic system (see Figure 1.1.3) provides hydraulic power to raise
and lower the upper stairway, A-frames and stabilizers. It consists of the
following components:
COMPONENT DESCRIPTION
Hydraulic Tank
The hydraulic uid tank is located on the side of the
chassis. The tank is provided with an in-tank uid
strainer. A dipstick is incorporated into the tank ll
cap. A clean-out port is located on top of the tank. A
drain plug is located at the bottom of the tank.
Hydraulic Pump
The hydraulic pump provides hydraulic power to
operate the stairway, A-frame and stabilizer cylinders.
The hydraulic pump is an internal gear (rotor) pump
coupled to the gasoline engine output shaft. It
operates whenever the engine is running. The pump
draws hydraulic oil from the hydraulic tank.
Auxiliary Hand Pump
The hand pump is located adjacent to the hydraulic
control valve and is equipped with an extension
handle. The hand pump provides emergency hydraulic
power for operating the stairs, A-frames and stabilizer
cylinders if the engine-driven pump is disabled.
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