Installation of the Fan Cowl Latches Monitoring Harness [CFML]

TASK 71-51-43-400-802-A
Installation of the Fan Cowl Latches Monitoring Harness

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: 4146KS

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL00700)	ELECTRICAL BONDING COATING (BLUE COLOR)
(Material No.CPNCL01420)	SEALANT LOW DENSITY-FUEL TANK & GP

C. Work Zones and Access Panels

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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	NUT	AIPC 71-13-10-22-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 73-25-34-710-805-A	Operational Test of the Engine Interface Unit (with CFDS)
Latches Monitoring Harness
Latches Monitoring Harness Connector

3. Job Set-up
Subtask 71-51-43-941-073-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
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 71-51-43-865-114-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/LATCH DOORS & SLATS/ENG1	93KS1	P39
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/LATCH DOORS & SLATS/ENG2	93KS2	P40
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41

Subtask 71-51-43-010-090-A

C. 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
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

4. Procedure
Subtask 71-51-43-420-078-A

A. Installation of the Latches Monitoring Harness
(1) Carefully put the latches monitoring harness (1) in position on the fan cowl door.
(2) Remove the CAP - BLANKING from the electrical connectors on the latches monitoring harness (1) and from the upper connector.
(3) Install the latches monitoring harness (1) with the screws (4), washers (2) and new AIPC 71-13-10-22-030 NUT (3) on the upper electrical support.
(4) Apply SEALANT LOW DENSITY-FUEL TANK & GP (Material No.CPNCL01420) and CPNCL00700ELECTRICAL BONDING COATING (BLUE COLOR) on the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(5) Connect the upper connector with the latches monitoring harness (1).
(6) Install the latches monitoring harness (1) with the screws (5) and (10), washers (6) and (9) and clamps (7), (8) and (11) on the fan cowl door electrical supports.
(7) Remove the CAP - BLANKING from the electrical connectors on the latches monitoring harness (1) and from the proximity sensors.
(8) Connect the latches monitoring harness connectors (1) to the proximity sensors:
(a) Carefully connect the latches monitoring harness connectors (1) to the proximity sensors.
(b) Turn the connector nut clockwise until get connection.

NOTE: The connector must not hide the red mark on the proximity sensor.

(c) Tighten the latches monitoring harness connectors by hand:
1 Turn clockwise each connector until the red mark of the proximity sensor is hidden.
2 When the red marking is hidden, turn each connector by hand until you hear two "clicks".

5. Close-up
Subtask 71-51-43-865-115-A

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/LATCH DOORS & SLATS/ENG1	93KS1	P39
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/LATCH DOORS & SLATS/ENG2	93KS2	P40
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41

Subtask 71-51-43-410-072-A

B. 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 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 71-51-43-710-072-A

C. Do the operational test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) (Ref. AMM TASK 73-25-34-710-805).

[Rev.10 from 2021] 2026.04.02 06:33:27 UTC