N2 Sensor Electrical Diagram
 Figure 005

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 Upper Display Unit of the ECAM System - N2 Indication
 Figure 006

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 Upper Display Unit of the ECAM System - N2 Indication
 Figure 006A

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 - the MASTER CAUT light comes on accompanied by a single chime

 - the following messages appear on the ECAM :

 - ENG 1(2) N2 OVERLIMIT

 - THR LEVER 1(2)...BELOW LIMIT
 When N2 > 105.8 percent :

 - The indication and the MASTER CAUT light and single chime remain as above but the ECAM message becomes:

 - ENG 1(2) N2 OVERLIMIT

 - THR LEVER 1(2)...IDLE

 - ENG MASTER 1(2)...OFF
 If N2 has exceeded 105 percent :

 - a red cross adjacent to N2 indication appears and remains during all the flight.

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 N1 SPEED SENSOR (4000EV) - REMOVAL/INSTALLATION
_______________________________________________ TASK 77-11-10-000-002 Removal of the N1 Speed Sensor (4000EV)
 1. Reason for the Job

__________________
 Self Explanatory

 2. Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps No specific container 1 l (0.25 USgal) No specific protective sheath No specific soft-nose connector pliers No specific warning notice
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors 77-11-10-991-301 Fig. 401
 3. Job Set-up
__________ Subtask 77-11-10-941-051
 A. Safety Precautions
 (1) On the center pedestal, on the ENG panel 115VU:

 (a) Put a warning notice to tell persons not to start the engine.

 (2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.

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 (3) On the overhead maintenance panel 50VU:

 (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

 (b) Put a warning notice to tell persons not to energize the FADEC 1(2).

 Subtask 77-11-10-010-051
 B. Get Access
 (1) Open the fan cowl doors (Ref. TASK 71-13-00-010-040):
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 4. Procedure
_________
 (Ref. Fig. 401/TASK 77-11-10-991-301)
 Subtask 77-11-10-020-051

 A. Removal of the N1 Speed Sensor
 (1) Disconnect the electrical cables from the N1 speed sensor (40). Use soft-nose connector pliers only if necessary.

 (2) Put blanking caps on the disconnected electrical connectors.

 (3) Remove the 2 bolts (60) which attach the N1 speed sensor to the fan frame (20).

 (4) Put a container 1 l (0.25 USgal) under the N1 speed sensor. NOTE : A 3 in.3 (50 cm3) to 6 in.3 (100 cm3) oil leakage can occur

____
 when you remove the N1 speed sensor.

 (5) Slowly and carefully pull the sensor out of the probe guide (10) and remove the N1 speed sensor (40) from the fan frame.

 (6) Remove the O-ring (50) from the probe guide (10). Discard the O-ring (50).

 (7) Put a protective sheath on the probe part of the N1 speed sensor.

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 N1 Speed Sensor
 Figure 401/TASK 77-11-10-991-301
　
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