Removal of the Electronic Engine Control (EEC) Cooling Blower (Upper) (PRE SB72-0191) [CFML]

TASK 75-24-05-000-802-A
Removal of the Electronic Engine Control (EEC) Cooling Blower (Upper) (PRE SB72-0191)

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.

FIN: 4605KS21
FIN: 4605KS22

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 1M(3 FT)
No specific	AR	CAP - PROTECTION
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
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 75-24-05-000-803-A	Removal of the EEC Blower Fire Shield Blanket (PRE SB72-0191)
Electronic Engine Control Cooling Blower (Upper)

3. Job Set-up
Subtask 75-24-05-941-052-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) 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 75-24-05-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	EEC BLOWER/ENG2	90KS2	M44
121VU	EEC BLOWER/ENG1	90KS1	P44

Subtask 75-24-05-010-052-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 75-24-05-020-051-A

A. Removal of the Electronic Engine Control (EEC) Cooling Blower (Upper) (1)
(1) Remove the EEC blower fire shield blanket (10) from the two blowers (1) (Ref. AMM TASK 75-24-05-000-803).
(2) Disconnection of the harness electrical connector

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 HJ2A harness electrical connector (2) from the EEC cooling blower (upper) (1).
(3) Removal of the EEC cooling duct (in) (3) from the EEC cooling blower (upper) (1):
(a) Loosen the screw (5) from the clip (6).
(b) Remove the clip (6) that attaches the EEC cooling duct (in) (3) to the EEC cooling blower (upper) (1).
(c) Disconnect the EEC cooling duct (in) (3) from the EEC cooling blower (upper) (1).
(4) Removal of the EEC cooling duct (out) (4) from the EEC cooling blower (upper) (1):
(a) Loosen the screw (7) from the clip (8).
(b) Remove the clip (8) that attaches the EEC cooling duct (out) (4) to the EEC cooling blower (upper) (1).
(c) Disconnect the EEC cooling duct (out) (4) from the EEC cooling blower (upper) (1).
(5) Removal of the EEC cooling blower (upper) (1) from the mounting bracket (11):
(a) Remove the four captive bolts (9) that attach the EEC cooling blower (upper) (1) to the mounting bracket (11).
(b) Remove the EEC cooling blower (upper) (1) from the mounting bracket (11).
(6) Install COVER - PROTECTION and CAP - PROTECTION on the open ports, open tubes, open hoses and connectors.

[Rev.10 from 2021] 2026.04.01 13:09:13 UTC