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Zorluk: OrtaNegative Detail Identification

Pneumatic de-icing boots are inflatable rubber membranes attached to the leading edges of aircraft wings and tail surfaces to remove accumulated structural ice. During flight in icing conditions, engine bleed air or an auxiliary pneumatic pump inflates these rubber bladders in rapid cycles. As the rubber expands outward, it cracks and breaks the bond of the brittle ice layer, allowing high-speed oncoming airflow to strip the ice away. The system then applies vacuum suction to deflate the boots completely flat against the wing to minimize aerodynamic drag. Flight crews must activate the system only after a measurable layer of ice forms, as inflating them prematurely can cause ice to bridge over the inflated boot without breaking off.

Based on the passage, which of the following statements about pneumatic de-icing boots is NOT accurate?

  1. A
    Vacuum suction is applied to deflate the bladders flat against the wing surface to minimize aerodynamic drag.
  2. They remain continuously inflated during flight in freezing conditions to prevent ice from adhering to the aircraft.Cevap
  3. C
    Engine bleed air or an auxiliary pump can be used to supply the air pressure required for inflation.
  4. D
    Inflating the system before a sufficient ice layer develops can lead to ice bridging over the membrane.

Cevap

The statement claiming that pneumatic de-icing boots remain continuously inflated during flight in freezing conditions is NOT accurate.
The correct choice is the statement asserting that de-icing boots remain continuously inflated during flight. The passage explicitly states that boots inflate in 'rapid cycles' to crack ice and are then deflated completely flat via vacuum suction. Thus, continuous inflation contradicts the text.

Adım Adım Çözüm

1
Identify the key requirement of the question stem.
The prompt requires locating the statement that is NOT accurate or contradicted by the passage.
Recognizing the negative qualifier prevents selecting true supporting details.
2
Scan the passage to verify each answer choice against the text.
The passage confirms that vacuum suction deflates boots to reduce drag, bleed air or auxiliary pumps provide inflation, and premature inflation causes ice bridging. Conversely, it states boots operate in 'rapid cycles' and deflate flat, rather than staying continuously inflated.
Systematic verification isolates the unsupported or contradicted assertion.
3
Select the statement that contradicts the factual information provided.
The assertion that boots stay continuously inflated to prevent ice adhesion is false according to the text.
Pneumatic de-icing is a de-icing system that removes existing ice in cycles, not an anti-icing system that stays continuously inflated.

Anahtar Kavram

Negative Detail Identification in Technical Texts
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Konular

Negative Detail Identification

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