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TM 1-4920-458-13&P
2-3.
CONTROLS AND INDICATORS
a.
General. This section describes and furnishes the operator with sufficient information pertaining to the various
controls and indicators provided for the proper operation of the equipment.
b.
Power Switch (1). The single pole, double throw, toggle-type power switch, has an OFF position which opens the
circuit and shuts off the electrical power supply to the tester. The ON position is in the circuit to provide electrical
current to the tester when the power source is connected.
c.
Indicator light (2). The indicator light illuminates when the power circuit in the tester is operating.
d.
Cartridge fuse (3). The 28 V dc, 5 amp cartridge fuse provides protection against an excessive flow of current
which would damage the electrical system.
e.
Vacuum Selector Knob (4). The vacuum selector knob has three positions, and operates a valve which controls
the vacuum systems required to test aircraft instruments.
f.
Pressure Selector Knob (5). The pressure selector knob has three positions and operates a valve which controls
the pressure systems required to test aircraft instruments.
g.
Pressure Bleed Down Knob (6). Counterclockwise rotation of pressure bleed down knob opens a needle valve
allowing system pressure to bleed off. ROTATE clockwise for pressure up.
h.
Pressure Control Knob (7). Counterclockwise rotation of pressure control knob opens a needle valve allowing
pressure in system to increase.
i.
Vacuum Bleed Knob (8). Counterclockwise rotation of vacuum bleed knob permits system vacuum to bleed off.
ROTATE clockwise for vacuum up.
j.
Vacuum Control Knob (9). Counterclockwise rotation of vacuum control knob opens a needle valve and provides
increased vacuum in system.
k.
Shut-off Valves (10). Shut-off valves located on the top of the operator panel are provided for testing aircraft
instruments and checking the master instruments for leaks.
l.
Altimeter Indicator (11). The altimeter indicator measures from -1,000 feet below to 35,000 feet above sea level
at a rate of 6,000 feet per minute.
2-3
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