Malfunctions in anti-ice can cause what % decrease in pressure?

• A. 10%
• B. 5%
• C. 24%
• D. 0%

Answer: (C)

Bleed air for anti-ice is a pressure-restricted supply, so when the anti-ice system malfunctions, you get a noticeable loss of available pressure in that pneumatic system. In UH-60S practice, a fault in the anti-ice path typically results in about a 24% drop in pressure. That level of decrease is large enough to reduce anti-ice effectiveness and can affect other bleed-air–dependent systems, which is why it’s the expected fault consequence.

Smaller drops (5% or 10%) would indicate a less severe issue or a different fault, and a 0% change would imply no impact at all, which isn’t consistent with a genuine anti-ice malfunction.