SECTION II
OPERATION
2-1. GENERAL.
2-2. This chapter contains procedures for utilizing the test set to test aircraft instuments
which operate within the equivalent pressure and vacuum ranges which are simulated by the
test set. A safety relief protection system is incorporated in the test set to protect both
the instruments of the test set and the instrument under test. If excessive pressure or
vacuum is applied to the instruments, the overload protection system automatically oper-
ates solenoid valves which close the pressure and vacuum lines to prevent damage to the
instruments.
2-3. PREPARATION FOR USE.
2-4. To prepare the test set for use. proceed as follows:
1. Set test set on level bench or platform within 9 feet of a source of d-c or a-c
power.
2. Look through window (9, figure 1-1) on right side panel of test set and observe
oil level in reservoir. Oil level must be within points indicated for test set to operate
properly. If oil level is low, fill reservoir in accordance with procedure given in para-
graph 3-3.
CAUTION
Do not force-tighten needle valves.
3. Set power ON-OFF switch (12, figure 1-1) to OFF, close four VACUUM and
PRESSURE needle valves (10 and 15), and set VACUUM and PRESSURE selector valves
(7 and 16) to OFF.
2-1