Removal of the Electronic Control Unit (ECU) [CFMI]

TASK 73-21-60-000-001-A
Removal of the Electronic Control Unit (ECU)

FIN: 4000KS ** 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	CAP - BLANKING
No specific	AR	PLIERS - NOSE, SOFT, LONG
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 31-36-00-740-006-A	Printout of the APU Hours and Cycles
TASK 31-36-00-740-007-A	Printout of the Engine Hours and Cycles
TASK 31-36-00-740-015-A	Printout of the Engine/APU Hours and Cycles Stored in the Flight Data Interface and Management Unit (FDIMU)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
ECU
ECU
ECU Removal/Installation
ECU
ECU Removal/Installation

3. Job Set-up
Subtask 73-21-60-740-063-A ** ON A/C NOT FOR ALL

A. Do a print-out of the engine hours and cycles and of the LRU IDENTIFICATION page of the MCDU and keep the prints with the engine for follow-up (Ref. AMM TASK 31-36-00-740-006) or (Ref. AMM TASK 31-36-00-740-007) or (Ref. AMM TASK 31-36-00-740-015).

NOTE: Some tasks will possibly not be applicable depending on whether a DMU or an FDIMU is installed on the aircraft.

Subtask 73-21-60-941-050-A ** ON A/C NOT FOR ALL

B. 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 73-21-60-010-050-A ** ON A/C NOT FOR ALL

C. Open the fan cowl doors: (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 73-21-60-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Electronic Control Unit (310)
(1) Disconnect the interface cooling air hoses (66) as follows:
(a) Loosen the clamp (65) and disconnect the inlet hose (66).
(b) Install CAP - BLANKING on the air hoses (66) and the inlet (60) and outlet (70) tubes of the interface cooling air connections.

CAUTION: DO NOT REMOVE THE ENGINE IDENTIFICATION CONNECTOR FROM THE LEAD. THE ENGINE IDENTIFICATION CONNECTOR MUST STAY WITH THE ENGINE.

(2) Disconnect the electrical connectors J1 (240), J2 (110), J3 (210), J4 (150), J5 (230), J6 (120), J7 (220), J8 (130), J9 (200), J10 (160), J11 (190), J12 (170), J13 (180) and J14 (140) engine identification connector from ECU (310). If necessary use PLIERS - NOSE, SOFT, LONG.

PRE SB (CFM56-5) 72-169 or POST SB (CFM56-5) 75-048
(a) Not applicable

POST SB (CFM56-5) 72-169 and PRE SB (CFM56-5) 75-048
(b) Remove the bleed bias J15 (100) connector from the ECU (310) receptacle.

END of SB (CFM56-5) 72-169
(3) Remove the air pressure tubes as follows:
(a) Cut and remove the lockwire from the PS12 (50) and the PS3 (30) hoses.
(b) If the engine has PMUX, cut and remove the lockwire from the PS13 (20) and P25 (40) hoses.
(c) If the engine is Non-PMUX, do not remove the PS13 (25) or P25 (45) caps.

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(d) Disconnect the PS12 (50), PS3 (30) and if installed (PMUX), the PS13 (20) and P25 (40) hoses from the ECU (310).
(4) Remove the cooling air flange as follows:
(a) Remove the bolts (320) that attach the cooling air flange (330) to the forward side of the ECU (310).
(b) Remove the cooling air flange (330) and the air flange seal (520).
(5) Loosen the mounting bolts (80) that attach the ECU (310) to the fan brackets.

NOTE: The ECU mounting bolts (80) will remain with the ECU (310).

(6) Remove the ECU (310).
(7) Put the PLUG-BLANKING in each disconnected line end.
(8) Put blanking caps on the disconnected electrical connectors and ECU receptacles.

[Rev.10 from 2021] 2026.04.01 02:56:45 UTC