How to measure speed of Fan (N1 shaft) @zeto.r
How to measure speed of Fan (N1 shaft)  @zeto.r
Uploaded June 2025 | Updated September 2026, 2 weeks ago
In this video I was not always sure if I'm correct but in over-voice it is. sorry for my English and not completely correct informations🙂

Let me show you how we measure the speed of N1 shaft in which you can find Fan, Low pressure compressor and Low pressure turbine

In this video, i will also walk you through the full process of replacing the N1 speed sensor on an Airbus A320 equipped with the CFM56-5B engine.

🔧 What’s Covered:

Sensor location and accessibility (5:00 o’clock position on strut No.6)

Removal and installation procedure

Torqueing and safety checks

Explanation of the sensor’s function and how it works with the EVMU and ECU

Tips for working in tight spaces around the fan frame


The N1 speed sensor is critical for detecting the rotational speed of the LP rotor. It transmits real-time data to the engine control systems and vibration monitoring units. Accurate readings mean safer and smoother flights. 💪✈️

Got questions about this task or aircraft maintenance in general? Drop them in the comments!

🔔 Don’t forget to like, comment, and subscribe for more real-world aviation maintenance content!



*********video is just for information purposes always stick to the latest maintenance manual. For this purpose, I didn´t record one removal/installation step*********

what is behind the fan:
youtu.be/yI3nvD481Eo


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———-Video content———————

00:00 - Intro
00:21 - removal of the speed sensor
01:34 - correction of informations
02:43 - continue in removal
04:55 - preparation for installation
06:14 - installation of the sensor
10:03 - test
12:22 - outro

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How to measure speed of Fan (N1 shaft)

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