During the calibration of an aircraft's auxiliary pitot-static system, technicians must adhere to a strict multi-step sequence to avoid damaging sensitive pressure transducers. First, the ground technician vents the reference chamber to ambient atmospheric pressure. Following this venting, the maintenance console is connected to the diagnostic port. Prior to applying the positive calibration pressure, the technician must close the isolation bypass valve. Once the test pressure stabilizes across all lines, the final step is to record the differential voltage readings on the avionics log.
According to the passage, which action must be completed immediately before positive calibration pressure is applied?
- AConnecting the maintenance console to the diagnostic port
- Closing the isolation bypass valveCevap
- CAllowing the test pressure to stabilize across all lines
- DRecording differential voltage readings on the log
Cevap
Closing the isolation bypass valve is the required step immediately prior to applying positive calibration pressure.
The passage uses the explicit chronological indicator 'Prior to applying the positive calibration pressure, the technician must close the isolation bypass valve.' This establishes closing the isolation bypass valve as the direct precursor to pressure application.
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