BAT Challenger 350 Practice Exam

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Is it possible that the surge valve may cause a noticeable hissing-type sound in the APU area?

No

Yes

The surge valve is a pressure-relief device in the APU bleed system that vents excess air when pressures rise or during transitions. When it opens to relieve surge or regulate bleed air, the escaping air can produce a noticeable hissing sound in the APU area. So it is possible to hear a hissing-type sound as the valve actuates, especially during start-up, changes in load, or shutdown when the system is venting.

Not at all

Sometimes

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