GE Druck ADTS 505

3 - 20 Operation
K0260 Issue No. 8
3.7.5 Leak Testing
General
Apply pressure to the system under test as detailed in Testing the Aircraft Static or Pitot system.
Before starting the leak test, check that the ADTS 505 is operating within range of the set limits.
Example
To leak test a pitot system to 300 knots at a maximum rate of 300 knots/min and a static system
to 30,000 ft at a maximum rate 5,000 ft/min. Tests with a wait time of 5 minutes and test time of
1 minute. Maximum pitot system leak rate allowed 5 kts/min or less. Maximum static system leak
rate 200 ft/min or less.
Procedure
1. Select F2 [Units], from the Main Menu, select F1 [ft, kts, kts/min]. Press CLEAR/QUIT to return to the
main menu.
2. Press SETUP, select F1 [Display], press F3 [Quad] and then press ALT/Ps, ROC/RATE Ps, SPEED/Qc
and RATE so that the display shows these parameters in the most appropriate order.
3. Press F3, [Rate Timer], then F3 [Set Wait 5.00], press ENTER and F4 [Set Time 1.00], press ENTER.
Press F6 to return to the Main menu.
4. Press the LEAK MEASURE/CONTROL to enter control mode. Press ROC/RATE Ps and set an Aim of
5000 ft/min. Press ALT/Ps and set an Aim value of 30,000 ft and press ENTER. The system starts
to control to the new set-point.
5. Press the LEAK MEASURE/CONTROL to enter measure mode. Press F1 [Rate Timer] and press F1
[Start Timing].
6. At the end of the timing check the rate of change (leak rate) this should be within the required limits
stated in the Aircraft Maintenance Manual; in this example 200 ft/min or less.
7. Press the LEAK MEASURE/CONTROL to enter control mode. The preset rate of speed is set at 300
knots/min. Press SPEED/Qc and set an Aim of 300 knots. The system starts to control to the new
set-point.
8. Press the LEAK MEASURE/CONTROL to enter measure mode. Press F1 [Rate Timer] and press F1
[Start Timing].
9. At the end of the timing check the rate of change (leak rate) this should be within the required limits
stated in the Aircraft Maintenance Manual; in this example 5 kts/min or less.
Note: If further testing is required, apply another pressure to the system under test and repeat the
steps above.
 On completion of testing, press the LEAK MEASURE/CONTROL to enter control mode, select
GROUND and wait for the `Safe at Ground' message to be displayed, see 3.7.8., refit the pitot and
static blanking caps.