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Airspeed Switch Test - GE Druck ADTS 505 User Manual

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Druck ADTS 505 User Manual

3.7.6 Airspeed Switch Test

The following example shows how an airspeed switch can be functionally checked.
Note: For low airspeed switches (i.e. 130 knots) Pitot only could be used, 3.7.2.
Press LEAK MEASURE/CONTROL to enter control mode. Press SPEED/Qc.
Enter an Aim value below the operating limits of the switch (i.e., airspeed switch operating at 130
knots ±2 knots set 127 knots).
If necessary, press RATE and enter a change of airspeed low enough to observe switch operation.
Press ENTER and observe the airspeed changing.
Using the NUDGE facility, to step-increase, at a fixed increment (0.2 knots), the Aim value.
Increase the Aim until the switch operates (contacts close) and record the value.
Change the Aim to above the airspeed operating range (i.e. 133 knots). Repeat the steps, decreasing
the Aim value until the airspeed switch operates (contacts open) and record value.
On completion of testing, select GROUND and wait for the `Safe at Ground' message to be displayed,
see 3.7.8., refit the pitot and static blanking caps.
This procedure can be repeated.
The above method can be used for the other parameters:
Examples:
Altitude switch
Mach switch
-
low altitude warning
-
landing gear configuration warning
-
height lock
-
Speed brake scheduling
-
Mach cruise lock
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K0260 Issue No. 8

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