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Question

Difficulty: HardWeaken

Aviation Inspector: Commercial airlines that implemented automated optical scanning systems for wing rivet inspections reported a forty percent decrease in undetected structural stress fractures compared to airlines relying solely on manual tactile inspections. Because these automated optical systems detect surface hairline irregularities far more rapidly than human technicians, mandating automated optical scanning industry-wide will substantially reduce the occurrence of catastrophic in-flight structural failures.

Which of the following, if true, most seriously weakens the aviation inspector's argument?

  1. A
    The financial cost of acquiring and maintaining automated optical scanning hardware exceeds the annual equipment budget of several regional commercial carriers.
  2. B
    Automated optical scanning devices do not inspect wing rivet surfaces at a rate significantly faster than veteran human maintenance specialists.
  3. Technicians at airlines utilizing automated optical scanning frequently omit secondary ultrasonic testing, which detects the subsurface metal fatigue responsible for almost all catastrophic failures.Answer
  4. D
    Human maintenance inspectors performing tactile examinations demonstrate significantly higher rates of error during prolonged overnight shifts.
  5. E
    Any commercial airline that succeeds in eliminating catastrophic in-flight structural failures will have implemented automated optical scanning across its entire fleet.

Answer

The argument is most seriously weakened by evidence that technicians using automated optical scanning frequently omit secondary ultrasonic testing that detects the subsurface metal fatigue responsible for nearly all catastrophic failures.
The correct response demonstrates that the adoption of automated optical scanning induces a procedural lapse: technicians bypass ultrasonic scans. Because subsurface metal fatigue—detectable only through ultrasonic testing—causes nearly all catastrophic failures, mandating optical scanning could paradoxically fail to prevent, or even exacerbate, catastrophic failures.

Step-by-Step Solution

1
Isolate the conclusion and supporting premises of the stimulus.
Premises establish that automated optical scanning detects surface hairline irregularities faster and correlates with fewer undetected stress fractures. The conclusion claims that mandating optical scanning industry-wide will substantially reduce catastrophic in-flight structural failures.
Clarifying the boundary between premise evidence and the author's broader claim exposes the logical leap.
2
Identify the core assumption bridging surface rivet scanning to catastrophic failure prevention.
The author assumes that catching surface stress fractures via optical scanning addresses the actual primary cause of catastrophic in-flight structural failures without creating offsetting diagnostic blind spots.
Weaken questions require identifying unstated assumptions linking the evidence to the outcome.
3
Evaluate the choices for new information that severs this link or reveals a counterproductive consequence.
The statement showing that adopting optical scanners leads maintenance crews to skip ultrasonic checks for subsurface fissures (which actually cause catastrophic failures) directly undermines the conclusion.
Introducing a negative behavioral side-effect that targets the true mechanism of catastrophic failure invalidates the claim that the mandate will improve safety.

Key Concept

Weaken via Flawed Causal Link and Unintended Diagnostic Trade-offs
Estimated Time:1m 20s
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