TM 55-4920-231-14
nections are made with the power switch (14,
CAUTION
Do not force knobs when fully opening
a. 28 vdc Power Source.
or closing as it will damage needle
(1) Remove power cable (14, figure 3)
valves.
from cover compartment (2).
(2) Connect plug connector P8 on W104
to provide desired opening and closing of valves.
d. Place case leak valve levers (3, 4, 5, 7, and
(9, figure 4).
8, figure 8) in desired positions and turn safety
(3) Attach the red clamp on W104 (figure
valve knob (14, figure 4) to provide desired
10) to the positive lead and the black clamp to
opening or closing of safety valve (13).
the negative lead of the power supply.
e. Provide a zero reading on rate-of-climb in-
b. 115 vac Three Phase Power Source.
dicator (2, figure 7) with the zero adjustment
(1) Remove power cables (9 and 14, fig-
(23).
ure 3) from cover compartment (2).
f. Place power switch (14) in OFF position
(2) Mate plug connector P5 on W101 (fig-
and make power source connections (paragraph
ure 10) with plug connector P9 on W103 and
35) to provide electrical power for tester.
connect plug connector P7 to POWER recepta-
cle connector J1 (9, figure 4).
CAUTION
(3) Connect plug connector P3 on W101
Do not change position of pressure or
vacuum selector knobs when pump mo-
c. 115 vac Single Phase Power Source.
tor is running, as serious damage to in-
(1) Remove power cables (10 and 14, fig-
struments on tester can result.
ure 3) from cover compartment (2).
g. Place power switch (14), in ON position
(2) Mate plug connector P6 on W102 (fig-
and observe indicator light (13 ) for illumina-
ure 10) with plug connector P9 on W103 and
tion.
attach plug connector P7 to POWER receptacle
h. Provide lubrication as instructed in para-
connector J1 (9, figure 4).
graph 51.
(3) Insert plug connector P1 on W102 (fig-
i. Place tester in a level position to perform
ure 10) in single phase power supply.
tests.
Shut the tester down in the following manner:
Prepare the tester for use in testing aircraft
instruments as follows:
CAUTION
Do not disconnect hose assemblies from
CAUTION
tester or change position of vacuum or
Do not operate tester with the reservoir
pressure selector knobs before all in-
dry for more than 10 seconds as it will
struments return to their normal read-
damage the motor pump assembly. Op-
ings, as the instruments involved can be
eration of the tester with excessive oil
damaged.
in the vacuum or pressure sumps will
damage the instruments and valves. Do
OFF position.
not change position of pressure or vac-
b. Rotate knobs (11, 12, 17, and 19) counter-
uum selector knobs when pump motor is
clockwise to open valves and allow all pressure
running, as serious damage to instru-
and/or vacuum to vent from tester.
ments on tester can result.
c. Disconnect power cable from POWER re-
a. Perform the before operation services listed
ceptacle (9, figure 4) and place in cover com-
in the operator's daily services (paragraph 54).
partment (2, figure 3).
d. Perform the after operation services listed
CAUTION
in the operator's daily service (paragraph 54).
When pressure or vacuum selector knob
is in a test position, the other selector
knob must be in the OFF position to
Aircraft instruments can be tested in either of
prevent damage to instruments.
the following ways:
b. Place PRESSURE and VACUUM selector
a. Individual Instrument Test. The instru-
knobs (10 and 20, figure 7) in desired positions.
ment can be tested after removal from aircraft
