K114 Issue No. 9
3 - 14 Operation
Leak Measure
Note: Compressing a gas generates heat. Gas heated or cooled in an enclosed volume causes
a pressure change. It is important, especially for leak testing, to allow enough time for
the heated gas to cool and the pressure to stabilize.
Press LEAK MEASURE/CONTROL to return to Leak Measure mode.
Press RATE TIMER, F3 - [Wait 05:00, Time 01:00].
Note: Different wait and time periods can be selected by pressing F1 or F2.
Wait until rate timer has completed and the results displayed.
Check rate of climb is less than ±100 ft/min and rate of airspeed (CAS) is less
than ±1 kt.
Press LEAK MEASURE/CONTROL to return to Control mode.
Press GROUND, F1, [Go to Ground].
Wait until for the display shows Safe At Ground.
After a successful leak test, the ADTS 405 is now ready to be connected to an aircraft
system or unit under test.
After an unsuccessful, first-time leak test, leave the system to achieve thermal stability
for a further five minutes, press CLEAR/QUIT and repeat the leak test. If the leak test is
now successful, the ADTS 405 is now ready to be connected to an aircraft system or
unit under test.
After another unsuccessful leak test, disconnect both hoses, check the condition of the
o-rings on the Ps and Pt connectors as detailed in the maintenance section and firmly
replace the blanking caps. Press CLEAR/QUIT and repeat the leak test procedure.
After a successful leak test without hoses connected, replace or repair the faulty
hose(s) and retest. If the ADTS 405 fails the leak test without hoses connected, switch
off and return the unit to the repair depot.
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