If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user


N3 Indicator

From SKYbrary Wiki

Article Information
Category: General General
Content source: SKYbrary About SKYbrary
Content control: SKYbrary About SKYbrary


The N3 Indicator is a cockpit gauge which presents the rotational speed of the high pressure (high speed) engine spool in a three spool jet engine such as the Rolls Royce RB211. The speed of this spool is referred to as N3. The N3 Indicator is usually calibrated in percent RPM based on an engine manufacturer defined rotational speed that corresponds to 100%. The indicator can be a "stand alone" analogue or digital gauge or the information can be incorporated into the aircraft Engine Indicating and Crew Alerting System (EICAS) or Electronic Centralized Aircraft Monitor (ECAM) systems if installed.

Related Articles