Installation of the N1 Sensor [CFML]

TASK 77-11-05-400-801-A
Installation of the N1 Sensor

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

FIN: 4064KS

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 65 and 58.8 lbf.in (0.73 and 0.66 m.daN )
No specific	Torque wrench: range to between 124 and 106 lbf.in (1.40 and 1.20 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
5	PACKING	EIPC 77-11-05-01-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 72-24-01-400-801-A	Installation of Segment Shrouds 1 thru 5
TASK 73-29-00-740-803-A	Idle Test (Menu Mode)
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
N1 Sensor

3. Job Set-up
Subtask 77-11-05-941-051-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 77-11-05-010-052-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 77-11-05-040-051-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 77-11-05-010-053-A

D. Get Access
(1) Make sure that the right thrust-reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR

4. Procedure
Subtask 77-11-05-020-051-A

A. General
(1) Remove all COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and connectors.

Subtask 77-11-05-420-051-A

B. Installation of the N1 Sensor

CAUTION: HANDLE THE N1 SPEED SENSOR CAREFULLY. THE SENSOR IS APPROXIMATELY 20 INCH (508 MM) LONG. DAMAGE TO THE SENSOR CAN OCCUR.

(1) Install the N1 sensor (7) in the fan hub frame (10) as follows:
(a) Lubricate the new preformed EIPC 77-11-05-01-020 PACKING (5) with engine oil (Material No.CP2442) .
(b) Install the new preformed EIPC 77-11-05-01-020 PACKING (5) on the groove of the N1 sensor (7).
(c) Lubricate the two bolts (8) with engine oil (Material No.CP2442) .

CAUTION: MAKE SURE THAT THE HOLES ARE CORRECTLY ALIGNED. IF THEY ARE NOT ALIGNED, DAMAGE TO THE SENSOR CAN OCCUR.

(d) Install the N1 sensor (7) in the fan hub frame (10).
(e) Tighten by hand the two captive bolts (8) of the N1 sensor (7).
(f) TORQUE the two captive bolts (8) to between 124 and 106 lbf.in (1.40 and 1.20 m.daN )

.
(2) Connect the electrical connector (6) and electrical connector (9) to the N1 sensor (7) (Ref. AMM TASK 70-70-00-910-804).
(3) Install the plate (1) as follows:
(a) Lubricate the threads of the four bolts (2) and the bolt (4) with graphite grease (Material No.CP2101) .
(b) Install the four bolts (2) that attach the plate (1) to segment shroud 3 (3) hand-tight.
(c) Install the bolt (4) that attaches the plate (1) to segment shroud 3 (3) hand-tight.
(d) TORQUE the four bolts (2) to between 65 and 58.8 lbf.in (0.73 and 0.66 m.daN )

.
(e) TORQUE the bolt (4) to between 124 and 106 lbf.in (1.40 and 1.20 m.daN )

.
(4) Install segment shroud 2 (Ref. AMM TASK 72-24-01-400-801).

5. Close-up
Subtask 77-11-05-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR

Subtask 77-11-05-440-050-A

B. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 77-11-05-710-050-A

C. Test
(1) Do the idle test (menu mode) (Ref. AMM TASK 73-29-00-740-803).

Subtask 77-11-05-410-051-A

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 07:41:36 UTC