TB 9-4920-363-24
(5) Case leak selector valves closed (fully cw).
d. Connect TI to ac or dc power cable, and connect power cable to a 115 V ac source or
28 V dc source.
CAUTION
When using a 115 V ac source, the TI case must be grounded to
prevent electrical shock.
CAUTION
During all operations, insure that the vacuum and pressure
selector valves are not moved from their positions and that air
lines are not disconnected while the pump motor is running or
while any indication other than zero can be observed on the
instruments. (The indications will be zero on the rate of climb
indicator, local ground level on the altimeter, zero knots on the
airspeed indicator.) Failure to observe this precaution will
result in serious damage to the master instruments and any
external instruments connected to the TI.
e. Check TI oil level located in reservoir through sight glass on right side panel. If oil
level is low, fill reservoir as indicated in (1) through (7) below:
CAUTION
To avoid damage to equipment, do not force-tighten needle valves.
(1) Remove cover plate in right side panel of TI.
(2) Unscrew TI cap nut from filler valve port and turn FILL-RUN-DRAIN valve
control to FILL.
(3) Attached one end of filler hose (part of TI) to filler valve port and other end to
container of MIL-H-5606 fluid.
(4) Set TI POWER switch to ON. When TI reservoir level is within points
indicated on sight glass, set POWER switch to OFF.
(5) Turn FILL-RUN-DRAIN control to RUN.
(6) Remove filler hose and replace filler valve port cap.
(7) Replace cover plate removed in (1) above.
f. Adjust altimeter barometric indicator for 29.92 inHg.
NOTE
Before making an accurate test, run each performance check
through its complete range of pressure or vacuum twice. This
exercising of the TI and standard will normalize a small
amount of hysteresis in diaphragms of TI so that correction
card errors will apply when values of function (altitude,
4