Instruments Navigation Aerominds - Air Navigation | Instruments | Chapter 6 - Vertical Speed Indicator (Part 2) | DGCA CPL NOTES & MCQS

Welcome to Aerominds Training Centre! In this video, we continue our DGCA Air Navigation – Flight Instruments series with an important cockpit instrument: the Vertical Speed Indicator (VSI). This topic is frequently tested in Directorate General of Civil Aviation CPL examinations, especially in the Technical General – Aircraft Instruments section. This lesson is designed especially for students who are new to aviation theory and want clear concept-based understanding instead of memorising complicated textbook definitions. In this video, we study the Instantaneous Vertical Speed Indicator (IVSI), which is an improved version of the VSI designed to reduce time lag and give faster response. You will learn how the accelerometer or dashpot unit inside the IVSI senses vertical acceleration, allowing the instrument to respond almost instantly when the aircraft starts climbing or descending. We also explain how the IVSI transitions from the accelerometer response to the normal pressure-difference system once the aircraft settles into a steady climb or descent. Important IVSI-specific errors are also discussed, including: • Overreaction of the instrument in turbulent conditions • False climb indications during steep level turns due to accelerometer piston movement In addition, we explain the presentation of the VSI scale, including the difference between linear and logarithmic scales, and why a logarithmic scale makes small vertical speeds easier to read near zero. Finally, we cover serviceability checks of the VSI, both on the ground and in the air, along with the permissible DGCA limits for instrument error and how pilots verify the accuracy of the instrument using the altimeter and stopwatch method. This video focuses on concept clarity, real cockpit understanding, and DGCA exam logic, so that you can both understand the instrument properly and answer MCQs confidently in the exam. Whether you are preparing for DGCA CPL, ATPL, or technical interviews, this lesson will strengthen your understanding of aircraft flight instruments. Follow us on Instagram for aviation updates, exam tips, and study guidance: 📸 @aeromindstrainingcentre Don’t forget to LIKE, SUBSCRIBE, and HIT THE BELL ICON for more DGCA exam-oriented aviation theory classes.