Visual Inspection of the Electronic Engine Control (EEC) Blower Fire Shield Blanket (PRE SB72-01-91) [CFML]

TASK 75-24-05-210-802-A
Visual Inspection of the Electronic Engine Control (EEC) Blower Fire Shield Blanket (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.

ZONE: 400

1. Reason for the Job
This procedure gives the visual inspection criteria for the exhaust tube.

NOTE: If necessary, remove high metal with hand blending before visual inspection.

NOTE: You can use equivalent alternatives for standard tools, equipment and consumable materials.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

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 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 75-24-05-000-803-A	Removal of the EEC Blower Fire Shield Blanket (PRE SB72-0191)
TASK 75-24-05-400-803-A	Installation of the EEC Blower Fire Shield Blanket (PRE SB72-0191)
Visual Inspection of the Electronic Engine Control (EEC) Blower Fire Shield Blanket

3. Job Set-up
Subtask 75-24-05-941-058-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 75-24-05-010-058-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 2M (6 FT) - ADJUSTABLE in position.
(3) Remove the EEC blower fire shield blanket (Ref. AMM TASK 75-24-05-000-803).

4. Procedure
Subtask 75-24-05-210-051-A

A. Visual Inspection of the Electronic Engine Control (EEC) Blower Fire Shield Blanket
(1) Table 601 - Visual inspection of all areas

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Tears, cuts	Not serviceable.

(2) Table 602 - Visual inspection of the fasteners (2)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Absence of adhesion	Not serviceable.

(3) Table 603 - Visual inspection of the decompression holes (3)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Inner obstruction	Not serviceable.

(4) Table 604 - Visual inspection of the external coating of inner envelope (4) and outer envelope (5)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Scratches	Permitted if: length is less than 50 mm (1.97 in.) and width is less 1 mm (0.04 in.), do not cross the fabric, you cannot see the fabric, the number of indications is less than three.
Tears	Permitted if: area is less than 4 mm2 (0.01 in.2), do not cross the fabric, you cannot see the fabric, the number of indications is less than three.
Local soft abrasion	Permitted if: area is less than 400 mm2 (0.62 in.2), do not cross the fabric, you cannot see the fabric, the number of indications is less than three.

5. Close-up
Subtask 75-24-05-410-054-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 03:14:46 UTC