Removal of the ECU (Channel A) Harness [CFMB]

TASK 71-51-43-000-046-A
Removal of the ECU (Channel A) Harness

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

ZONE: 400
FIN: 4211KS ** 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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
ECU Channel A Harness - Upper Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL
ECU Channel A Harness - Lower Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL
ECU Channel A Harness - Upper Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL
ECU Channel A Harness - Lower Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 71-51-43-941-056-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 71-51-43-865-068-A ** ON A/C NOT FOR ALL

WARNING: OPEN THE PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3) BEFORE ENG1(2)FADEC A and EIU 1(2) C/B'S 2KS1 AND 2KS2. IF YOU DO NOT OBEY THIS SEQUENCE:

THE PROBES WILL BECOME TOO HOT.
THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CVR/SPLY	2RK	E14
49VU	COM/CVR/CTL	4RK	E13
** ON A/C NOT FOR ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
49VU	ANTI ICE/PROBES/AOA/1	4DA1	D04
49VU	ANTI ICE/PROBES/PITOT/1	3DA1	D02
** ON A/C NOT FOR ALL
49VU	ANTI ICE/RAIN/RPLNT/CAPT	1DB1	D01
** ON A/C NOT FOR ALL
49VU	COM/CVR/SPLY	23RK	E14
49VU	COM/CVR/CTL	26RK	E13
** ON A/C NOT FOR ALL
121VU	RCDR/DFDR	7TU	K16
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
122VU	ANTI ICE/WINDOWS/R	4DG2	W14
122VU	ANTI ICE/WINDOWS/L	4DG1	X14
122VU	ANTI ICE/PROBES/2/PITOT	3DA2	Y14
122VU	ANTI ICE/PROBES/2/AOA	4DA2	Y13
122VU	ANTI ICE/PROBES/2/STATIC	5DA2	Y11
122VU	ANTI ICE/PROBES/3/PITOT	3DA3	Z16
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15
122VU	ANTI ICE/PROBES/3/STATIC	5DA3	Z14
122VU	ANTI ICE/PROBES/1/STATIC	5DA1	Z13
** ON A/C NOT FOR ALL
122VU	ANTI ICE/RAIN/RPLNT/F/O	1DB2	W11
** ON A/C NOT FOR ALL
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03
FOR FIN: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	ENGINE/IGN/ENG1/SYS A BAT	2JH1	P39
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
122VU	ELEC/GCU/1	2XU1	T26
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
121VU	ENGINE/IGN/ENG2/SYS A BAT	2JH2	P40
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41
121VU	ENGINE/ENG2/FADEC B	4KS2	Q40
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39
122VU	ELEC/GCU/2	2XU2	T27

Subtask 71-51-43-010-059-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 71-51-43-020-056-A ** ON A/C NOT FOR ALL

A. Removal of the Electronic Control Unit (ECU) (Channel A) Harness

NOTE: To open the flip-lock clamps and line blocks, turn the captive screws or captive bolts 1/4 turn counterclockwise to disengage the cam nuts.

NOTE: Loosely attach the clamp(s), anti-rotation lug(s) if applicable, and bolt(s) to the brackets from which they were removed to make it easier for installation.

(1) Disconnect electrical connectors 402VC-A and 406VC-A from the pylon junction box.

ECU Channel A Harness - Upper Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL

ECU Channel A Harness - Upper Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL

(2) Disconnect electrical connector 4004VC-A from the junction box at station 167 (B2).
(3) Open the flip-lock clamp (10) that attaches the harness (5) to the bracket.

BEFORE SPIB NO. CFM02255MW1

(4) Open the line blocks (15), (20), and (25) that attach the harness (5) to the brackets at station 158 (B1).
(5) If necessary, remove the rubber supports from the line blocks.
(6) Remove the harness (5) from the rubber supports and the flip-lock clamp (10).

CONFIG-1

(7) Open the line block (30) that attaches the harness (5) to the bracket at station 167 (B2).

END OF CONFIG-1

CONFIG-2

ECU Channel A Harness - Upper Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL

ECU Channel A Harness - Upper Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL

(Detail B)
(8) Remove the bolt (55) that attaches the clamp (60) to the bracket at station 167 (B2). Remove the clamp (60) from the harness (5).

END OF CONFIG-2

(9) Open the line blocks (25), (40), (45) and (50) that attach the harness (5) to the brackets.

ECU Channel A Harness - Lower Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL

ECU Channel A Harness - Lower Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL

(10) If necessary, remove the rubber supports from the line blocks.
(11) Remove the harness (5) from the rubber supports.
(12) Open the flip-lock clamp (35) near ignition exciter A and remove the harness (5).

AFTER SPIB NO. CFM02255MW1

(13) Open the line block (25) that attaches the harness (5) to the bracket at station 158 (B1).

ECU Channel A Harness - Upper Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL

ECU Channel A Harness - Upper Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL

(14) If necessary, remove the rubber supports from the line block.
(15) Remove the bolts and clamps (17) that attach the harness (5) to the bracket at station 158 (B1).
(16) Remove the bolts and clamps (22) that attach the harness (5) to the bracket at station 158 (B1).
(17) Remove the harness (5) from the rubber supports, the flip-lock clamp (10) and the clamps (17) and (22).

CONFIG-1

(18) Open the line block (30) that attaches the harness (5) to the bracket at station 167 (B2).

END OF CONFIG-1

CONFIG-2

ECU Channel A Harness - Upper Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL

ECU Channel A Harness - Upper Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL

(Detail B)
(19) Remove the bolt (55) that attaches the clamp (60) to the bracket at station 167 (B2). Remove the clamp (60) from the harness (5).

END OF CONFIG-2

(20) Open the line blocks (25), (40), (45) and (50) that attach the harness (5) to the brackets.

ECU Channel A Harness - Lower Right Fan Zone (PRE SB RA32071-131) ** ON A/C NOT FOR ALL

ECU Channel A Harness - Lower Right Fan Zone (POST SB RA32071-131) ** ON A/C NOT FOR ALL

(21) If necessary, remove the rubber supports from the line blocks.
(22) Remove the harness (5) from the rubber supports.
(23) Remove the bolt, clamp and anti-rotation lug (37) near ignition exciter A and remove the harness (5).

END OF SPIB NO. CFM02255MW1

(24) Disconnect electrical connector 4000JH1-A from ignition exciter A.
(25) Disconnect electrical connectors 4000KS-J1 and 4000KS-J3 from the ECU.
(26) Remove the electrical harness (5) from the engine.
(27) Put the COVER - PROTECTION on the electrical connectors.

[Rev.10 from 2021] 2026.04.02 07:30:18 UTC