- ENG 1(2) N1 OVERLIMIT

 - THR LEVER 1(2)...BELOW LIMIT

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 Upper Display Unit of the ECAM System - N1 Indication
 Figure 003

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 Upper Display Unit of the ECAM System - N1 Indication
 Figure 003A

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 If N1 has exceeded 104 percent :

 - the maximum value reached is memorized

 - a small red line remains positioned on the analog scale at that value (max pointer). Above 105.8 percent the messages displayed on the ECAM becomes:

 - ENG 1(2) N1 OVERLIMIT

 - THR LEVER 1(2)...IDLE

 - ENG MASTER 1(2)...OFF

 N1 LIM
 - Value and modes appear in green (modes are CL, MCT, FLX TO, GA)

 - in FLX TO, the selected fictitious temperature is displayed in green. N1 MAX

 - a small amber line positioned across the N1 analog scale at the value

 corresponding to that of the TO/GA mode.
 N1 THR

 - a small white circle the shape of which recalls that of the throttle. This indication signals the predictive N1 value at which the engine LP rotor speed will stabilize for the given throttle position.

 N1 CMD

 - a small arc in cyan colour linking the N1 actual value to the N1 CMD. This is displayed only with the autothrottle engaged. When the engine speed is stable, N1 actual = N1 CMD and the N1 CMD indication is not visible.

 3. N2 Indicating System
____________________
 A. General The measurement channel for the high pressure rotor speed is designed as follows :
 - a speed sensor installed on the engine sends a signal to the ECU

 - the ECU processes the N2 signal and transmits it to the ECAM through the ARINC 429 data bus (Ref. 73-25-00).

 B. N2 Speed Sensor
 (1) General The N2 speed sensor is installed at 6:30 o'clock on the accessory gearbox (AGB) rear face with 2 bolts. When the sensor is installed, only the 3 fixed connectors and sensor body are visible.

 (2) Description
 (Ref. Fig. 004)
 The N2 speed sensor consists of the following :
 A body including :

 - three fixed connectors
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 N2 Speed Sensor Figure 004
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 - a flange for attachment to the AGB.

 - a groove which accommodates a seal for tightness between sensor and
 AGB. A metal rigid tube including a magnetic head equipped with 3 polar pieces.
 (3) Operation (Ref. Fig. 005) The N2 speed sensor detects the rotational speed of the HP rotor assembly. It transmits the signal to the following equipment :
 - Engine Vibration Monitoring Unit (EVMU)

 - ECU (channel A)

 - ECU (channel B) This sensor is an induction tachometer type. It comprises 3 sensitive elements. Each element is magnetically and electrically isolated from the other. Each sensitive element includes a magnet, a coil and a polar mass. These sensitive elements are hermetically sealed in a stainless steel housing. The sensitive elements transmit signals. The signals are supplied to the 3 connectors through resin embedded wires. A magnetic wheel, part of the AGB drive system, is provided with 71 teeth on its web. The passage of each tooth in front of the magnetic head modifies the lines of magnetic force of the magnets. This creates a flux variation in the coils. The flux variation generates an alternating electromotive force proportional to the rotational speed of the HP rotor assembly.

 C. N2 Indication
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 (Ref. Fig. 006)
R **ON A/C 106-149, 303-399, 401-499,
 (Ref. Fig. 006A)
 **ON A/C ALL
 The N2 indication is displayed on the upper display unit of the ECAM
 system. The N2 indication is provided in the digital form.
 The indication is normally green
 When N2 > 105 percent :

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