ATPL Instruments 022 - Ep.11: Vertical Speed Indicator - VSI | ATPL Training | ATPL Exams

Welcome back to ATPLation! ✈️ In this episode of our ATPL Instruments series, we focus on the Vertical Speed Indicator (VSI), an essential flight instrument that provides pilots with a clear indication of rate of climb or descent. Understanding how the VSI works, its potential errors, and its role in aircraft operations is crucial for ATPL exams and real-world flight safety. ✅

📌 What you'll learn in this episode:

📈 Principle of Operation – How the VSI Works
The VSI measures the rate of change of static pressure.

It contains a calibrated leak (capillary tube), creating a slight delay in pressure change inside the case compared to the aneroid capsule.

The difference between the capsule pressure and case pressure moves the needle, showing climb or descent in feet per minute (fpm) or meters per second (m/s).

🔄 Types of VSI
Standard VSI – Shows actual climb or descent rate with a slight lag (typically 6–9 seconds).

Instantaneous VSI (IVSI) – Equipped with accelerometers to provide faster, near-instantaneous indications.

⚠️ VSI Errors
Lag Error – The inherent delay between the pressure change and needle response.

Blocked Static Port – VSI remains frozen at zero, no climb or descent indication.

Instrument Leak – Results in inaccurate or erratic readings.

Turbulence and Rapid Maneuvers – Can momentarily cause incorrect indications.

🛫 Aircraft Applications of VSI
Assists in smooth climbs and descents, especially during instrument flight (IFR).

Used in approach and departure procedures to maintain vertical profiles.

Helps with rate-based navigation guidance, such as meeting specific climb/descent rates assigned by ATC.

🚨 Operational & Safety Considerations
Cross-check VSI readings with altimeter and attitude indicator to avoid misinterpretation.

Recognizing symptoms of a blocked static system or instrument malfunction.

Following EASA, FAA, ICAO regulations on instrument checks and calibration.

🎯 Why this episode matters:
✔️ VSI operation and errors are key ATPL exam topics.
✔️ Essential for rate control, descent planning, and smooth altitude changes.
✔️ Provides real-world insights into how the VSI supports safe vertical navigation.

🚀 Whether you're preparing for EASA, FAA, or ICAO ATPL exams, or looking to expand your understanding of vertical navigation instruments, this episode delivers clear explanations and practical applications.

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Видео ATPL Instruments 022 - Ep.11: Vertical Speed Indicator - VSI | ATPL Training | ATPL Exams канала ATPLation