Chapter 4. Operation
34 | ADTS 405 R/F Mk2 Instruction Manual-English
© 2017 General Electric Company – All Rights Reserved.
i.
Press the
LEAK MEASURE/CONTROL
key to enter into Leak Measure mode.
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:
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.
Alt 4998 ft
Leak Measure
CAS 299.0 kts
Leak Measure
ROC -1.00T ft/m
RtCA -0.10T kts/m
Timed Rates
