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h.
The ADTS 405 displays any detected errors. Check that the power-up sequence continues
through the following stages without error:
•
Calibration date.
•
Self-test.
•
Measuring ground pressures.
•
Equalizing system pressures.
i.
Check that the display then changes to show measured altitude and airspeed (CAS or TAS)
values.
j.
Press the MACH/Pt key and check the display changes to show Altitude and Mach
measured values.
Note: (1) The displayed values change as atmospheric pressure changes at
power-up.
(2) The display shows the "WARMUP" message in the lower right corner indicating
that full pressure accuracy and stability may not be achieved. The WARMUP
message clears after 15 minutes. This indication does not inhibit operation and
these tests may proceed without waiting for the message to clear.
(3) An automatic zero (if enabled) takes place regularly. The display shows "ZERO"
and the state of the valves, on the mimic panel, change for approximately six
seconds. Commands may still be entered while auto-zero takes place.
5.3.1.2 Pump unit (ADTS 405F)
a.
Set the front panel switch for the pump unit to PUMP ON and check that the pump power
indicator lights.
b.
Press LEAK MEASURE/CONTROL to go to control mode.
c.
Enter an altitude aim of 5000 ft by pressing 5, 0, 0, 0, ENTER.
d.
Enter rate or use default rates.
e.
Enter an airspeed aim of 500 knots by pressing SPEED/Qc, 5, 0, 0, ENTER.
f.
Check that these aim values are achieved.
5.3.1.3 Completion
On completion of this test procedure, select GROUND, [Go to Ground] wait until the unit is at
ground, switch off and disconnect the power supply.
5.3.2 Fault Finding
In the event of a more serious ADTS system fault which prevents visibility of specific error messages
and fault codes on the instrument display, fault location chart Figure 5-1 can be used in conjunction
with Table 5-2 to direct what service or repair actions may be required.
© 2015 General Electric Company – All rights reserved.
Standard Serviceability Test
ADTS 405 Mk2 Instruction Manual-English | 61
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