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

 Actions

N1 Indicator

From SKYbrary Wiki

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

Description

The N1 Indicator is a cockpit gauge which presents the rotational speed of the low pressure (low speed) engine spool, a speed that is referred to as N1. The gauge 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.

On many jet engines, N1 is the primary indication of engine thrust and determination of a target N1 is an important facet of the takeoff performance calculations. Engine Pressure Ratio (EPR) is used for the same purpose on other engine types.

ECAM
Example of an ECAM display with both an EPR and a N1 indicator

Related Articles