Fault Finding
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ADTS 405 R/F Mk2 Instruction Manual-English | 59
• Equalizing system pressures.
Note:
See Section 3.2.2, “Power-up,” on page 16 for a typical power-up sequence.
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.
Note:
(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.
Note:
(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
6 seconds. Commands may still be entered while auto-zero takes place.
6.4.2 Pump Unit (ADTS 405F Mk2)
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 kts by pressing
SPEED/Qc, 5, 0, 0, ENTER
.
f.
Check that these aim values are achieved.
6.4.3 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.
6.5 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 6-1 can be
used in conjunction with Table B-1 to direct what service or repair actions may be required.
