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Difficulty: HardSequential Detail Extraction

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?

  1. A
    Connecting the maintenance console to the diagnostic port
  2. Closing the isolation bypass valveAnswer
  3. C
    Allowing the test pressure to stabilize across all lines
  4. D
    Recording differential voltage readings on the log

Answer

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.

Step-by-Step Solution

1
Locate the target event in the passage
Identified the target phrase 'applying the positive calibration pressure'.
Establishing the anchor event is necessary to determine preceding and succeeding steps.
2
Analyze chronological transition cues surrounding the target event
Located the modifier 'Prior to applying the positive calibration pressure, the technician must close the isolation bypass valve.'
The cue 'prior to' explicitly introduces the mandatory immediate precursor to the calibration step.
3
Confirm the sequential arrangement against all options
Closing the isolation bypass valve is identified as the step that occurs directly before pressure application.
Eliminates earlier setup tasks and subsequent diagnostic phases.

Key Concept

Sequential Detail Extraction
Estimated Time:1m 30s
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Sequential Detail Extraction

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