TB 9-4920-459-24
a. Connect pneumatic pressure standard 17 PSIA inlet port and 5 PSID inlet port to TI
Ps and Pt outlet port respectively.
b. Set TI main power switch and pump power switch to on (allow 1 hour for warmup).
NOTE
Ensure that pneumatic pressure standard is at the same
altitude reference as the TI.
NOTE
Protect the TI and the pneumatic pressure standard
connections from drafts and rapidly changing temperatures.
NOTE
Ensure that TI is used in the CONTROL MODE when
NOTE
Ensure that the pneumatic pressure
standard
5-psid
transducer has been zeroed.
NOTE
Ensure that hose connections are tight, but do not force
tighten.
c. Set pneumatic pressure standard to read altitude in feet and airspeed in knots.
d. Set TI controls for a leak check as follows:
(1) Press LEAK MEASURE/CONTROL key then press SPEED key and enter a
speed aim of 200 kts.
(2) Press ALT key and enter an altitude of aim of 35000 ft.
(3) Press ROC key and enter a rate of climb of 6000 ft/min.
(4) Press SPEED key and wait for the altitude and speed aims to be achieved then
wait 1 minute.
(5) Press LEAK MEASURE/CONTROL key to select MEASURE MODE.
(6) Press RATE TIMER key and select F3; wait 5 minutes, time 1 minute.
(7) Wait until the waiting and timing is complete and check that the rate of climb is
less than 90 ft/min.
(8) If leak rate is greater than 90 ft/min, repeat the rate timing using 5 minute wait,
1 minute time. If still greater than 90 ft/min, then check the integrity of the pneumatic
connections and leak test the pneumatic pressure standard and the TI.
(9) Press LEAK MEASURE/CONTROL key to regain control, then press ALT key.
(10) Enter an altitude aim of 0 ft.
(11) Press SPEED key and enter a speed aim of 400 kts.
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