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.
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Press LEAK MEASURE/CONTROL to enter control mode. Press SPEED/Qc.
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Enter an Aim value below the operating limits of the switch (i.e., airspeed switch operating at 130
knots ±2 knots set 127 knots).
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If necessary, press RATE and enter a change of airspeed low enough to observe switch operation.
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Press ENTER and observe the airspeed changing.
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Using the NUDGE facility, to step-increase, at a fixed increment (0.2 knots), the Aim value.
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Increase the Aim until the switch operates (contacts close) and record the value.
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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.
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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.
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This procedure can be repeated.
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The above method can be used for the other parameters:
Examples:
Altitude switch
Mach switch
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low altitude warning
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landing gear configuration warning
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height lock
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Speed brake scheduling
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Mach cruise lock
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K0260 Issue No. 8
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