Testing Aircraft Systems or UUT
© 2015 General Electric Company – All rights reserved. ADTS 405 Mk2 Instruction Manual-English | 35
d. Press EPR then RATE to select EPR rate.
e. Enter required value e.g, 5 EPR/min and press ENTER.
f. Press ALT/Ps.
g. Enter 500 mbar (15 inHg) and press ENTER.
h. Press EPR.
a. An EPR of 1.8 will quickly be achieved.
Note: EPR testing can also be performed by specifying the actual INLET and
OUTLET values.
3.6 Testing Aircraft Systems or UUT
WARNING OBSERVE THE APPROPRIATE SAFETY INSTRUCTIONS AND PROCEDURES
DETAILED IN THE AIRCRAFT MAINTENANCE MANUALS OR COMPONENT MAINTENANCE
MANUALS.
a. Connect the applicable hoses and adapters to the aircraft system or UUT.
b. Do a leak test detailed in the appropriate aircraft or component manual, to make sure that
the connections to the aircraft system or UUT are not leaking.
3.6.1 Go To Ground and Shut-down
At the end of testing and, before disconnecting from the aircraft system or UUT, the pressures in
the system must be taken to the local atmospheric pressure (ground) with zero airspeed, as
follows:
a. If the display shows “Leak Measure”, press LEAK MEASURE/CONTROL.
b. Press GROUND, F1, [Go To Ground].
c. Wait for the display to show “Safe At Ground”.
d. It is now safe to disconnect the aircraft system or UUT.
The pressure in the system changes towards ground. The ground pressure or “Ground” replaces the
static or altitude aim value.
3.6.1.1 While Going to Ground
If required, new rates of change can be entered while going to ground.
• To change the ROC or static rate, press ROC/Ps Rate and enter the new value.
• To change the airspeed or Qc rate, press SPEED/Qc then RATE and enter the new
value.
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