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A blocked static port affects which instruments?

Choices

  • Only the altimeter

    The static port feeds more than just the altimeter.

  • ✓ The airspeed indicator, altimeter, and vertical speed indicatorcorrect

    All three pitot-static instruments rely on the static port, so all three are affected.

  • Only the vertical speed indicator

    The VSI is affected, but so are the ASI and altimeter.

  • The attitude indicator and heading indicator

    Those are gyroscopic instruments, not part of the pitot-static system.

Why

A blocked static port makes the airspeed indicator inaccurate, freezes the altimeter, and disables the vertical speed indicator, which is why an alternate static source is provided.

FAA source: PHAK Ch. 8browse the reference library →

This is taught in The Pitot-Static Instruments and Their Failures — study the lessons free, then practice with grading and mastery tracking.

Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.

A blocked static port affects which instruments? · PPL Free Ground School