Visual Inspection of the Electronic Engine Control (EEC) Cooling Blowers (PRE SB72-01-91) [CFML]

TASK 75-24-05-210-801-A
Visual Inspection of the Electronic Engine Control (EEC) Cooling Blowers (PRE SB72-01-91)

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.

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	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 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 75-24-05-000-801-A	Removal of the Electronic Engine Control (EEC) Cooling Blower (Lower) (PRE SB72-0191)
TASK 75-24-05-000-802-A	Removal of the Electronic Engine Control (EEC) Cooling Blower (Upper) (PRE SB72-0191)
TASK 75-24-05-000-803-A	Removal of the EEC Blower Fire Shield Blanket (PRE SB72-0191)
TASK 75-24-05-400-801-A	Installation of the Electronic Engine Control (EEC) Cooling Blower (Lower) (PRE SB72-0191)
TASK 75-24-05-400-802-A	Installation of the Electronic Engine Control (EEC) Cooling Blower (Upper) (PRE SB72-0191)
TASK 75-24-05-400-803-A	Installation of the EEC Blower Fire Shield Blanket (PRE SB72-0191)
Electronic Engine Control (EEC) Cooling Blowers

3. Job Set-up
Subtask 75-24-05-941-054-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
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 75-24-05-010-054-A

B. 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.
(3) Remove the EEC blower fire shield blanket (Ref. AMM TASK 75-24-05-000-803).

4. Procedure
Subtask 75-24-05-210-050-A

A. Visual Inspection of the Electronic Engine Control (EEC) Cooling Blower (Upper) (1) and EEC Cooling Blower (Lower) (2)
(1) Make sure that the labels (3) are correctly installed and information can be read.
(2) Do a visual inspection of all surfaces:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Cracks	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).
Dent	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).
Tear	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).
Corrosion	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).
Erosion	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).
Nicks	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).
Scratch	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).
Deposits	Not serviceable	Do the applicable steps as follows: (a) Replace the EEC cooling blower (upper) (1) (Ref. AMM TASK 75-24-05-000-802) and (Ref. AMM TASK 75-24-05-400-802). (b) Replace the EEC cooling blower (lower) (2) (Ref. AMM TASK 75-24-05-000-801) and (Ref. AMM TASK 75-24-05-400-801).

5. Close-up
Subtask 75-24-05-410-052-A

A. Close Access
(1) Install the EEC blower fire shield blanket (Ref. AMM TASK 75-24-05-400-803).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) 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
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:14:45 UTC