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TASK 77-11-10-400-002
Installation of the N1 Speed Sensor (4000EV)
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific adhesive tape
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. CP2179 *
lanolin (Ref. 70-30-00)
Material No. CP2442 *
engine oil (Ref. 70-30-00)
Material No. CP5070 *
vaseline (Ref. 70-30-00)
C. Expendable Parts
-------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
R 50 o-ring 77-11-10 01 -050
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D. Referenced Information
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REFERENCE DESIGNATION
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71-13-00-010-040 Opening of the Fan Cowl Doors
71-13-00-410-040 Closing of the Fan Cowl Doors
77-11-10-991-301 Fig. 401
3. Job Set-up
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Subtask 77-11-10-860-051
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 77-11-10-010-053
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
4. Procedure
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(Ref. Fig. 401/TASK 77-11-10-991-301)
Subtask 77-11-10-420-051
A. Installation of the N1 Speed Sensor
(1) Lubricate a new O-ring (50) with engine oil (Material No. CP2442).
(3) Remove the protective sheath from the sensor probe.
R (2) Install the new o-ring (50) in the recess of the probe guide (10).
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(4) Clean the pole pieces of the sensor probe with a clean, dry cloth.
(5) Complete the cleaning with a piece of adhesive tape to remove any magnetic particles.
R (6) Lubricate the two probe dampers with vaseline (Material No. CP5070) or lanolin (Material No. CP2179).
(7) Install the N1 speed sensor (40) as follows:
CAUTION : DO NOT USE TOO MUCH FORCE WHEN YOU ENGAGE THE SENSOR PROBE
_______ IN THE FAN FRAME PROBE GUIDE TO PREVENT DAMAGE TO THE PROBE.
(a) Align the sensor probe with the probe guide (10). Engage the probe in the probe guide and push it slowly down the guide. Be careful to keep axial alignement and a smooth movement throughout the probe engagement.
(b) When the sensor probe is fully engaged by hand and in the free state (bolts (60) not installed), measure the gap between the machined surfaces of:
1 the mounting flange of the N1 speed sensor,
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2 the sleeve (70)
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(c) The measured gap must be between 0.12 in. (3.08 mm) and 0.24 in.
(6.09 mm) .
(d) If the gap is not in the limits before installation of bolts (60),
CAUTION : THE N1 SPEED SENSOR IS SPRING-LOADED TO KEEP ITS INNER
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