TB 9-4920-459-24
NOTE
If TI is out of tolerance at any point go to ground and perform
a. Performance Check
(1) Press LEAK MEASURE/CONTROL key and select CONTROL MODE.
(2) Press SPEED key, and enter a speed aim of 0 kts.
(3) Enter an altitude aim of 0 ft., wait for aim to be achieved, and allow 1 minute
to stabilize.
(4) Press SPEED key and enter the first speed aim in table 4.
Pneumatic pressure standard
Test instrument
indications
indications
(knots)
(knots)
Min
Max
20
18.5
21.5
40
38.5
41.5
60
58.5
61.5
80
79.0
81.0
100
99.0
101.0
200
199.0
201.0
300
299.0
301.0
400
399.0
401.0
(5) Allow the aim to be achieved and wait 1 minute to stabilize. Check that the
displayed reading of altitude on the pneumatic pressure standard is within the tolerance
(6) Repeat (4) and (5) above for remaining airspeeds listed in table 4.
(7) Press GROUND key, press F1 key and select ground.
(8) When safe at ground remove all connections.
(9) If out-of-tolerance readings occur, perform paragraph b below. If no out-of-
tolerance readings occur, perform the following non-reportable adjustment to update the
calibration date displayed upon startup of the TI, then perform paragraph 10 below.
(a) Replace blanking caps on Ps and Pt outputs on the TI.
(b) Press LEAK MEASURE/CONTROL key then press the GROUND key and
select F1 key to select ground.
(c) Remove calibration label that covers the calibration enable screw on the TI
and unscrew the calibration enable screw counterclockwise until it is free to rotate.