Installation of the N2 Speed Sensor [CFMI]

TASK 77-11-20-400-001-A
Installation of the N2 Speed Sensor

FIN: 4001EV ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	PLIERS - CONNECTOR, JAW, SOFT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
20	O-RING	AIPC 77-11-20-01-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 71-00-00-710-006-A	Minimum Idle Check
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
N2 Speed Sensor

3. Job Set-up
Subtask 77-11-20-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) 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(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 77-11-20-010-053-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 77-11-20-420-050-A ** ON A/C NOT FOR ALL

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.
(2) Lubricate a new AIPC 77-11-20-01-030 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 Textile-Lint free Cotton - (Material No.14SBA1) .
(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 110 and 100 lbf.in (1.24 and 1.13 m.daN )

.
(9) Make sure that the connectors and the receptacles are clean and clear of unwanted materials.
(10) Connect the cable connectors.

CAUTION: CAREFULLY ALIGN THE CONNECTOR KEY WITH THE RECEPTACLE KEYWAY BEFORE YOU CONNECT THEM TO PREVENT DAMAGE TO THE CONNECTORS.

(a) Connect the cable connectors to the N2 speed sensor receptacles. Use PLIERS - CONNECTOR, JAW, SOFT only if necessary .
(11) Make sure that the connectors are fully engaged and do not move.

Subtask 77-11-20-861-050-A ** ON A/C NOT FOR ALL

B. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 77-11-20-869-050-A ** ON A/C NOT FOR ALL

C. Do the EIS start procedure (upper and lower ECAM DU's) (Ref. AMM TASK 31-60-00-860-001).

Subtask 77-11-20-710-050-A ** ON A/C NOT FOR ALL

D. Do this test.
(1) Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
(2) Do the steps below:
(a) On the MCDU, select the CFDS MENU page.
(b) Push the line key adjacent to SYSTEM/REPORT TEST.
(c) Push the NEXT PAGE mode key: a new SYSTEM REPORT/TEST page comes into view.
(d) Push the line key adjacent to the ENG indication: the SYSTEM REPORT/TEST ENG page comes into view.
(e) Push the line key adjacent to the FADEC 1A(1B) for engine 1.
(f) Push the line key adjacent to the FADEC 2A(2B) for engine 2.
(g) Push the line key adjacent to the LAST LEG REPORT.
(h) Make sure that the message "N2 SENS, J7(J8), ECU" is not in view.

5. Close-up
Subtask 77-11-20-860-051-A ** ON A/C NOT FOR ALL

A. Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).

Subtask 77-11-20-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 77-11-20-410-050-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:37:35 UTC