Removal of the Electronic Engine Control (EEC) Channel A (upper) [CFML]

TASK 73-21-55-000-802-A
Removal of the Electronic Engine Control (EEC) Channel A (upper)

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.

ZONE: 400
FIN: 4601KS1

1. Reason for the Job
A. A two-person alternative method is available for the EEC installation/removal procedures.
(1) A minimum of two persons are necessary to handle the EEC during the installation/removal procedures if the jack stand and the EEC adapter support equipment are not utilized.
B. The weight of the EEC is approximately 37 lb (16.8 kg).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)
9471M17	3	STAND, JACK - LRU INSTALL/REMOVE
956A1616G01	3	ADAPTER, INSTALL/REMOVE - EEC

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
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 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 73-29-00-710-804-A	Weight Configuration (Menu Mode)
TASK 73-29-00-710-808-A	Nacelle Anti-Icing (NAI) Valve Lock Open (Menu Mode)
TASK 73-29-00-740-809-A	Read the LRU Identification Report (Menu Mode)
EEC Channel A (upper) (PRE CFM SB 73-00-0010)
EEC Channel A (upper) (POST CFM SB 73-00-0010)
EEC Channel A (upper) (POST CFM SB 73-00-0024)

3. Job Set-up
Subtask 73-21-55-740-050-A

A. Do the following task:

CAUTION: IF YOU REPROGRAM THE TWO CHANNELS, PRINT THE INSTALLED FAN-BALANCE WEIGHTS AND ENTER THEM AGAIN IN THE EEC. IF YOU DO NOT OBEY THIS INSTRUCTION, THE ENGINE FAN-BALANCE WEIGHTS WILL NOT AGREE WITH THE WEIGHTS SAVED IN THE EEC MEMORY. THIS CAN CAUSE INCORRECT FAN-TRIM-BALANCE CALCULATION AND A FAN UNBALANCE.

(1) Do a print-out of the engine hours and cycles (Ref. AMM TASK 31-36-00-740-015).
(2) Do a print-out of the Line Replaceable Unit (LRU) identification report (Ref. AMM TASK 73-29-00-740-809).
(3) Do a print-out of the Nacelle Anti-Icing (NAI) lock-open configuration (Ref. AMM TASK 73-29-00-710-808).
(4) If the EEC A removal is part of a dual channel replacement, meaning both EEC A and EEC B are getting replaced, do a print-out of the fan-balance weight configuration (Ref. AMM TASK 73-29-00-710-804). Do this step on the two channels.

Subtask 73-21-55-941-052-A

B. 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) Put WARNING NOTICE(S) 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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-21-55-010-052-A

C. Get Access
(1) Open the fan cowl doors (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) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 73-21-55-020-051-A

A. Removal of EEC Channel A

EEC Channel A (upper) (PRE CFM SB 73-00-0010)

PRE CFM SB 73-00-0010 and PRE CFM SB 73-00-0024
(1) Disconnect the harness connectors from the applicable receptacles of EEC channel A (1):

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(a) Disconnect the HJ8A harness electrical connector (3) from EEC channel A (1).
(b) Disconnect the HJ7 harness electrical connector (4) from EEC channel A (1).
(c) Disconnect the HJ6A harness electrical connector (5) from EEC channel A (1).
(d) Disconnect the HJ5A harness electrical connector (6) from EEC channel A (1).
(e) Disconnect the HJ4A harness electrical connector (7) from EEC channel A (1).
(f) Disconnect the HJ3A harness electrical connector (8) from EEC channel A (1).
(g) Disconnect the HJ2A harness electrical connector (9) from EEC channel A (1).
(2) Remove the EEC cooling duct (2) from EEC channel A (1):
(a) Loosen the screw (10) from the clamp (11) that attaches the EEC cooling duct (2) to EEC channel A (1).
(b) Remove the clamp (11) from the EEC cooling duct (2).
(c) Disconnect the EEC cooling duct (2) from the EEC channel A (1).
(3) Remove the EEC channel A (1) from the mounting brackets (13):

NOTE: If the two-person alternative method is used, Para. 4.A.(3)(a), Para. 4.A.(3)(b),Para. 4.A.(3)(e), Para. and 4.A.(3)(f) must not be done.

(a) Install the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC on the EEC channel A (1).
(b) Install the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC on the 9471M17 STAND, JACK - LRU INSTALL/REMOVE.
(c) Remove the four bolts (12) that attach EEC channel A (1) to the four mounting brackets (13).
(d) Remove EEC channel A (1) with its bonding jumpers from the mounting brackets (13).
(e) Remove the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC from the 9471M17 STAND, JACK - LRU INSTALL/REMOVE.
(f) Remove the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC from the EEC channel A (1).
(4) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.

END OF PRE CFM SB 73-00-0010 and PRE CFM SB 73-00-0024

Subtask 73-21-55-020-053-A

B. Removal of EEC Channel A

EEC Channel A (upper) (POST CFM SB 73-00-0010)

POST CFM SB 73-00-0010 and PRE CFM SB 73-00-0024
(1) Disconnect the harness connectors from the applicable receptacles of EEC channel A (1):

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(a) Disconnect the HJ8A harness electrical connector (3) from EEC channel A (1).
(b) Disconnect the HJ7A harness electrical connector (4) from EEC channel A (1).
(c) Disconnect the HJ6A harness electrical connector (5) from EEC channel A (1).
(d) Disconnect the HJ5A harness electrical connector (6) from EEC channel A (1).
(e) Disconnect the HJ4A harness electrical connector (7) from EEC channel A (1).
(f) Disconnect the HJ3A harness electrical connector (8) from EEC channel A (1).
(g) Disconnect the HJ2A harness electrical connector (9) from EEC channel A (1).
(2) Remove the EEC cooling duct (2) from EEC channel A (1):
(a) Loosen the screw (10) from the clamp (11) that attaches the EEC cooling duct (2) to EEC channel A (1).
(b) Remove the clamp (11) from the EEC cooling duct (2).
(c) Disconnect the EEC cooling duct (2) from the EEC channel A (1).
(3) Remove the EEC channel A (1) from the mounting brackets (13):

NOTE: If the two-person alternative method is used, Para. 4.B.(3)(a), Para. 4.B.(3)(b), Para. 4.B.(3)(h) and Para. 4.B.(3)(i) must not be done.

NOTE: The cap is attached to the engine. It is possible to unscrew the cap and keep it attached to the engine.

(f) Remove the four bolts (12) that attach the EEC channel A (1) to the four mounting brackets (13).
(g) Remove EEC channel A (1) with its bonding jumpers from the mounting brackets (13).
(h) Remove the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC from the 9471M17 STAND, JACK - LRU INSTALL/REMOVE.
(i) Remove the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC from the EEC channel A (1).
(4) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.

END OF POST CFM SB 73-00-0010 and PRE CFM SB 73-00-0024

Subtask 73-21-55-020-055-A

C. Removal of EEC Channel A

EEC Channel A (upper) (POST CFM SB 73-00-0024)

POST CFM SB 73-00-0024
(1) Disconnect the harness connectors from the applicable receptacles of EEC channel A (1):

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

NOTE: If the two-person alternative method is used, Para. 4.C.(2)(a), Para. 4.C.(2)(b), Para. 4.C.(2)(h) and Para. 4.C.(2)(i) must not be done.

(a) Install the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC on the EEC channel A (1).
(b) Install the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC on the 9471M17 STAND, JACK - LRU INSTALL/REMOVE.
(c) Remove the bolt (14) and the nut (15) that connect to the retaining cables (16) and (17). The nut and the bolt can be left with the retaining cables.
(d) Remove the bolt (14) and the nut (15) that connect the retaining cable (18). The nut and the bolt can be left with the retaining cable.
(e) Disconnect the cap on connector J9 of the EEC which is tied to the engine. The cap can be unscrewed from the EEC and left tied to the engine.
(f) Remove the four bolts (12) that attach EEC channel A (1) to the four mounting brackets (13).
(g) Remove EEC channel A (1) with its bonding jumpers from the mounting brackets (13).
(h) Remove the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC from the 9471M17 STAND, JACK - LRU INSTALL/REMOVE.
(i) Remove the 956A1616G01 ADAPTER, INSTALL/REMOVE - EEC from the EEC channel A (1).
(3) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.

END OF POST CFM SB 73-00-0024

[Rev.10 from 2021] 2026.04.01 03:05:01 UTC