Further Testing; Environmental And Preliminary Operations; Pressure Leak Check - GE Druck ADTS 405 R/F Mk2 Instruction Manual

Air data test set

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5.6 Further Testing

Perform the following tests if a pneumatic leak or a controller instability is suspected.

Do the tests in a room with a stable temperature environment and within the operating

temperature range. The room must be free from drafts. Read the whole of the test procedure

before commencement.

Note: The unit must be thermally stable; switch on and leave the unit for at

least one hour to achieve thermal stability.

Change the units to mbar as follows:

Press SETUP then select [UNITS].

Repeatedly select [NEXT] until the display shows "mbar".

Select [SAVE] and then press CLEAR/QUIT twice and the display now shows Ps and Pt in

units of mbar.

This check confirms that the unit does not leak under positive pressure conditions:

Press LEAK MEASURE/CONTROL to enter control mode. The display shows "Aim" in place

of "Leak Measure".

Enter a Ps aim of 1016 mbar by pressing: ALT/Ps, 1, 0, 1, 6, ENTER.

Enter a Qc aim of 272 mbar by pressing: SPEED/Qc, 2, 7, 2, ENTER. Wait for the aim values

to be achieved then wait for 1 min.

Press LEAK MEASURE/CONTROL to return to Leak Measure mode.

Press RATE TIMER and select [WAIT 05:00], [TIME 01:00]. Observe that the "Waiting" time

is shown on the display as it counts down, followed by the "Timing" time.

At the end of the "Timing" period, the display shows the rate of change of Ps, Qc and Pt with

a "T" to indicate timed average.

Check that the Ps, Qc and Pt rates are less than or equal to ±0.5 mbar/min. If the leak rate

is not achieved, allow further thermal stabilization time and re-test by pressing RATE

TIMER and selecting [WAIT 05:00], [TIME 01:00].

Press CLEAR/QUIT to exit rate display.

Further Testing

ADTS 405 Mk2 Instruction Manual-English | 65

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