(3) Remove the two bolts (10) which attach the sensor to the pad of the accessory gearbox (AGB).

 (4) Remove the N2 speed sensor from its recess.

 (5) Remove the O-ring (20) from the sensor housing. Discard the O-ring (20).

 (6) Put a blanking cap on the sensor probe.

 (7) Put a blanking plug in the AGB pad recess.

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 N2 Speed Sensor
 Figure 401/TASK 77-11-20-991-300

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 TASK 77-11-20-400-002
 Installation of the N2 Speed Sensor (4001EV).
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific clean, dry cloth
 No specific soft-nose connector pliers
 No specific warning notice
 No specific Torque Wrench : range 36.00 to 220.00 lbf.in

 (0.40 to 2.60 m.daN)
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2101 USA MIL-T-5544
 graphite grease (Ref. 70-30-00)
 Material No. CP2442 *
 engine oil (Ref. 70-30-00)

 C. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
R 20 O-ring 77-11-20 01 -020
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 D. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
 from the External Power 31-60-00-860-001 EIS Start Procedure 31-60-00-860-002 EIS Stop Procedure 71-00-00-710-006 Minimum Idle Check 71-13-00-010-040 Opening of the Fan Cowl Doors 71-13-00-410-040 Closing of the Fan Cowl Doors
 3. Job Set-up
__________
 Subtask 77-11-20-860-054
 A. Aircraft Maintenance Configuration
 (1) On the center pedestal, on the ENG panel 115VU, make sure that a warning notice is in position to tell persons not to start the engine.

 (2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a warning notice is in position to tell persons not to energize the FADEC 1(2).

 Subtask 77-11-20-010-052
 B. Make sure that the fan cowl doors are open: (Ref. TASK 71-13-00-010-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
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 4. Procedure
_________
 Subtask 77-11-20-420-051

 A. Installation of the N2 Speed Sensor:
 (1) Remove the blanking caps and plugs from the cable connectors, the N2 sensor receptacles and probe, and the AGB pad recess.
R (2) Lubricate a new O-ring (20) with engine oil (Material No. CP2442).
 (3) Install the O-ring (20) in the groove of the sensor housing.

 (4) Clean the pole pieces of the sensor with a clean, dry cloth.

 (5) Use adhesive tape to complete cleaning and remove any magnetic particles.

 (6) Install the N2 speed sensor in the AGB recess.

 (7) Lubricate the threads of bolts (10) with graphite grease (Material No. CP2101).

 (8) Attach the N2 speed sensor: CAUTION : TIGHTEN THE BOLTS ALTERNATELY TO PREVENT DISTORTION OF THE

_______
 N2 SPEED SENSOR.

 (a) Attach the N2 speed sensor to the AGB with the two bolts (10). TORQUE the bolts (10) to between 100 and 110 lbf.in (1.13 and
 1.24 m.daN).
 (9) Make sure that the connectors and the receptacles are clean and clear of unwanted materials.
　
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