SECTION I
INTRODUCTION AND DESCRIPTION
sufficiently to assure the efficient removal of moisture
1.1 CONTENTS OF MANUAL
and oil vapor from the high-pressure air.
1.1.1 This manual is published for the information and
c. A check valve, installed in series with the back
guidance of personnel responsible for Compressor,
pressure valve, prevents reverse air flow from the
under 3800219 and 3800219-1. The manual describes
receiver to the moisture separator. A system drain
the compressor assembly; contains instructions for
valve, installed in a tee fitting mounted on the check
operating, servicing, maintaining, overhauling and
valve outlet port, allows air in the downstream
testing the overall equipment and component
pneumatic section to be relieved to atmosphere.
assemblies.
d. A dehydrator assembly containing a replacement
1.2 ORIENTATION
desiccant cartridge is installed in the pneumatic line
downstream from the check valve. The dehydrator
1.2.1 Throughout this manual, the terms "right," "left,"
provides a further drying action which assures the
"front," and "rear" are used to specify the location of
delivery of high-pressure air having a minimum moisture
various component parts of the equipment. "Front"
content.
indicates the end of the cart which mounts the tow bar (i.
e., the forward end of the cart when being towed).
e. A line filter containing a replaceable micronic filter
"Rear" indicates the end opposite the front. "Left" and
element is installed downstream from the dehydrator.
"right" designate the two sides when facing in the
The line filter removes a minimum of 98 per cent of all
direction of normal travel (i.e., the instrument panel is
particles larger than 10 microns from the high-pressure
on the left side of the cart).
air.
1.3 GENERAL DESCRIPTION
(See
f. Two pressure relief valves installed in the high-
through 1-4)
pressure pneumatic line open automatically to exhaust
air to atmosphere if the pressure exceeds a
1.3.1 Compressor Package Assembly, part number
predetermined value.
The valves close (reseal)
3800219-1, is a compact, self-contained, mobile unit,
automatically, preventing the further escape of air, when
specifically designed for supplying clean, dry
normal pressures are restored. One pressure relief
compressed air as required for ground support
valve is installed in a port of the filter and separator; the
maintenance of aircraft and similar equipment. The
other valve is mounted in a safety fitting located
compressor package assembly is capable of delivering
immediately upstream from the receiver.
4.0 cubic feet per minute of free air against a discharge
pressure of 3300 pounds per square inch when
g. Replaceable rupture discs installed in the cap of
operating at a nominal speed of 3550 revolutions per
the filter and separator assembly and a safety fitting
minute, and with sea level ambient air pressure at the
located at the inlet to the receiver provide a blowout
inlet port of the compressor first stage cylinder.
relief factor which safeguards the pneumatic system
against excessive air pressure in the event the relief
1.3.2 The compressor package assembly consists
valves fail to function.
basically of a radial, three-stage, reciprocating piston
type air compressor which is directly coupled to, and
h. The dry, high-pressure air is stored in a spherical
driven by, a one-cylinder, four-cycle, air-cooled gasoline
receiver mounted at the front of the unit.
engine provided with a recoil starter mechanism. The
complete package includes:
i. An instrument panel located on the left side of the
unit mounts the various controls required to monitor and
a. A filter and separator assembly which removes
control the delivery of high-pressure air. These include:
moisture and oil vapor from the high-pressure discharge
a pressure gage which measures receiver air pressure;
air. The condensate collecting in the moisture separator
a regulator, shutoff valve, pressure gage and outlet
is removed periodically during compressor operation by
fitting which are used when servicing low-pressure
pressing a push valve located on the instrument panel,
equipment; a similar regulator, shutoff valve, pressure
thus opening a dump valve installed in the bottom of the
gage and outlet fitting for use when servicing high-
separator chamber.
pressure equipment; a push valve which controls
operation of the filter and separator pneumatic dump
b. A back pressure valve installed in the filter and
valve; and an electric receptacle for connecting an
separator outlet port prevents the flow of air to the
external source of 27-volt dc.
receiver until the separator chamber is pressurized
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