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Chapter 4. Operation
i.
Press the LEAK MEASURE/CONTROL key to enter into Leak Measure mode.
Alt
Leak Measure
CAS
Leak Measure
j.
Press RATE TIMER and select a suitable wait and time period. After the rate timer
test has completed, the ADTS will show the leak rates:
ROC
RtCA
Timed Rates
k.
After a successful leak test, the ADTS 405 Mk2 is ready to be connected to an aircraft
system or unit under test.
l.
If the preliminary leak test is unsuccessful, leave the system to achieve thermal
stability for a further 5 minutes, press CLEAR/QUIT and repeat the leak test.
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.
m. After another unsuccessful leak test:
i.
Disconnect both hoses, check the condition of the o-rings on the Ps and Pt
connectors. Replace if necessary as detailed in the Section 5.4.2, "Replacing
the Output Connector O-ring," on page 51. Then firmly replace the blanking
caps.
ii.
Press CLEAR/QUIT and repeat the leak test procedure.
iii. After a successful leak test without hoses connected:
iv. Replace or repair the faulty hose(s) and re-test.
v.
If the ADTS 405 Mk2 fails the leak test without hoses connected, switch off
and return the unit to the repair depot.
4.6 Aircraft System Protection
The ADTS 405 Mk2 protects the aircraft system against user error and leaks in the aircraft
system.
Note: The pumps must be switched on.
The system protection operates by:
• Limit checking of user entered set-points.
• Automatic regain of control if leak rate is over limit during leak testing.
• Automatic regain of control if a leak takes the system pressures outside of limits.
34 | ADTS 405 R/F Mk2 Instruction Manual-English
4998
299.0
-1.00T
-0.10T
kts/m
ft
kts
ft/m
© 2017 General Electric Company – All Rights Reserved.
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