Visual Inspection of the Strut 1 [CFML]

TASK 72-24-03-210-801-A
Visual Inspection of the Strut 1

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 criteria for the visual inspection of the strut 1 outer fitting, the strut 1 Right Hand (RH) fairing, the strut 1 Left Hand (LH) fairing, the strut 1 RH pad and the strut 1 LH pad.

NOTE: The inspection criteria below are applicable after the removal of the high metal.

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 1M(3 FT)
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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

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 72-24-03-000-801-A	Removal of the Strut 1
TASK 72-24-03-300-801-A	Left Hand (LH) and Right Hand (RH) Strut 1 Fairings and Strut 1 Pads - Replacement of the Bonded Seal
TASK 72-24-03-300-804-A	Engine Kit - Strut 1 Fairings and Strut 1 Outer Fitting - Blending and Spot Touch-Up
TASK 72-24-03-300-805-A	Blending of the Struts Pads
TASK 72-24-03-400-801-A	Installation of the Strut 1
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Strut 1 Outer Fitting
Strut 1 RH Fairing
Strut 1 LH Fairing
Strut 1 RH Pad
Strut 1 LH Pad
Strut 1 Fairing Support
Strut 1 RH Fairing
Strut 1 LH Fairing

3. Job Set-up
Subtask 72-24-03-941-057-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 a 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 72-24-03-010-059-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.

Subtask 72-24-03-040-057-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-24-03-010-064-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 72-24-03-220-056-A

A. Dimensional Inspection of the Strut 1 RH Fairing (3)

DIMENSION	MINIMUM SERVICEABLE LIMIT	MAXIMUM SERVICEABLE LIMIT
DIM. D	0.07 in. (1.8 mm)	/

Subtask 72-24-03-220-055-A

B. Dimensional Inspection of the Strut 1 LH Fairing (5)

DIMENSION	MINIMUM SERVICEABLE LIMIT	MAXIMUM SERVICEABLE LIMIT
DIM. C	0.07 in. (1.8 mm)	/

Subtask 72-24-03-210-050-A

C. Visual Inspection of the Strut 1 Outer Fitting (1), the Strut 1 RH Fairing (3), the Strut 1 LH Fairing (5), the Strut 1 RH Pad (7) and the Strut 1 LH Pad (10)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual inspection of all the areas of the strut 1 outer fitting (1):
A.Fretting, Erosion or Wear	Any amount, if parent material is not visible	See repair (Ref. AMM TASK 72-24-03-300-804).
B.Missing anodized coating	Any amount, if no corrosion (white foam)	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Nicks and Scratches	Any number if not more than 0.0003 in. (0.01 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-804).
D.Cracks	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-804).
2.Visual inspection of the area A of the strut 1 outer fitting (1):
A.Dents	Any number, if not more than 0.023 in. (0.6 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-804).
B.Fretting, Erosion or Wear	Any amount, if parent material is not visible
3.Visual inspection of the area B of the strut 1 outer fitting (1):
A.Dents	Any number if not more than 0.003 in. (0.1 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-804).
B.Fretting, Erosion or Wear	Any amount, if parent material is not visible
4.Visual inspection of the area W of the strut 1 outer fitting (1):
A.Dents	Any number if not more than 0.003 in. (0.1 mm) in depth
B.Fretting, Erosion or Wear	Permitted if no more than 0.0078 in. (0.2 mm) in depth
5.Visual examination of the replaceable and floating nuts (2) of the strut 1 outer fitting (1):
A.Missing	Not serviceable
B.Looseness	Not serviceable
C.Deviation	Not serviceable
6.Visual inspection of all the areas of the strut 1 RH fairing (3):
A.Fretting, Erosion or Wear	Any amount, if parent material is not visible	See repair (Ref. AMM TASK 72-24-03-300-804).
B.Missing OAS	Any amount, if no corrosion (white foam)	See repair (Ref. AMM TASK 72-24-03-300-804).
7.Visual inspection of the area D of the strut 1 RH fairing (3):
A.Grinding aspect	Any amount
B.Dents	Any number, if not more than 0.023 in. (0.6 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Any amount, if parent material is not visible
8.Visual inspection of the area C of the strut 1 RH fairing (3):
A.Grinding aspect	Any amount
B.Dents	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Any amount, if parent material is not visible
9.Visual inspection of the area F of the strut 1 RH fairing (3):
A.Grinding aspect	Any amount
B.Nicks, Scratches or Cracks	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Any amount, if parent material is not visible
10.Visual inspection of the area E of the strut 1 RH fairing (3):
A.Grinding aspect	Any amount
B.Nicks, Scratches or Cracks	Any number, if not more than 0.023 in. (0.6 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Permitted until dimensional inspection serviceable limit of DIM. D
11.Visual examination of the seal (4) of the strut 1 RH fairing (3):
A.Missing fully or not	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
B.Disbonded	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
C.Break, Crack, Scratch and Color change	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
D.Bubbles	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
E.Permanent strain or Excessive strain	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
12.Visual inspection of all the areas of the strut 1 LH fairing (5):
A.Fretting, Erosion or Wear	Any amount, if parent material is not visible	See repair (Ref. AMM TASK 72-24-03-300-804).
B.Missing OAS	Any amount, if no corrosion (white foam)	See repair (Ref. AMM TASK 72-24-03-300-804).
13.Visual inspection of the area G of the strut 1 LH fairing (5):
A.Grinding aspect	Any amount
B.Dents	Any number, if not more than 0.023 in. (0.6 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Any amount, if parent material is not visible
14.Visual inspection of the area H of the strut 1 LH fairing (5):
A.Grinding aspect	Any amount
B.Dents	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Any amount, if parent material is not visible
15.Visual examination of the area K of the strut 1 LH fairing (5):
A.Grinding aspect	Any amount
B.Nicks, Scratches or Cracks	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Any amount, if parent material is not visible
16.Visual examination of the area J of the strut 1 LH fairing (5):
A.Grinding aspect	Any amount
B.Nicks, Scratches or Cracks	Any number, if not more than 0.023 in. (0.6 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-804).
C.Fretting, Erosion or Wear	Permitted until dimensional inspection serviceable limit of DIM. C
17.Visual examination of the seal (6) of the strut 1 LH fairing (5):
A.Missing fully or not	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
B.Disbonded	Not serviceable	Replace the strut 1 LH fairing (5) (Ref. AMM TASK 72-24-03-000-801) and (Ref. AMM TASK 72-24-03-400-801).
C.Break, Crack, Scratch and Color change	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
D.Bubbles	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
E.Permanent strain or Excessive strain	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
18.Visual inspection of all the areas of the strut 1 RH pad (7):
A.Fretting, Erosion or Wear	Any amount, if dimension D is between 0.114 in. (2.9 mm) and 0.201 in. (5.1 mm)
19.Visual inspection of the area M of the strut 1 RH pad (7):
A.Dents	Any number, if not more than 0.023 in. (0.6 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-805).
B.Nicks and Scratches	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-805).
20.Visual inspection of the area L of the strut 1 RH pad (7):
A.Nicks, Dents and Scratches	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-805).
21.Visual inspection of the area P of the strut 1 RH pad (7):
A.Nicks, Dents and Scratches	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-805).
B.Cracks	Not serviceable
22.Visual inspection of the area N of the strut 1 RH pad (7):
A.Nicks, Scratches or Cracks	Any number, if not more than 0.023 in. (0.6 mm) in depth
23.Visual inspection of the replaceable nuts (8) of the strut 1 RH pad (7):
A.Missing	Not serviceable
B.Looseness	Not serviceable
C.Deviation	Not serviceable
24.Visual examination of the seal (9) of the strut 1 RH pad (7):
A.Missing fully or not	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
B.Disbonded	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
C.Break, Crack, Scratch and Color change	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
D.Bubbles	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-804).
E.Permanent strain or Excessive strain	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
25.Visual inspection of all the areas of the strut 1 LH pad (10):
A.Fretting, Erosion or Wear	Any amount, if dimension E is between 0.114 in. (2.9 mm) and 0.201 in. (5.1 mm)
26.Visual inspection of the area R of the strut 1 LH pad (10):
A.Dents	Serviceable if not more than 0.024 in. (0.6 mm) in depth	See repair (Ref. AMM TASK 72-24-03-300-805).
B.Nicks and Scratches	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-805).
27.Visual inspection of the area Q of the strut 1 LH pad (10):
A.Nicks, Dents and Scratches	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-805).
28.Visual inspection of the area T of the strut 1 LH pad (10):
A.Nicks, Dents and Scratches	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-805).
B.Cracks	Not serviceable
29.Visual examination of the area S of the strut 1 LH pad (10):
A.Nicks, Scratches or Cracks	Serviceable if not more than 0.023 in. (0.6 mm) in depth
30.Visual examination of the replaceable nuts (11) of the strut 1 LH pad (10):
A.Missing	Not serviceable
B.Looseness	Not serviceable
C.Deviation	Not serviceable
31.Visual inspection of the seal (12) of the strut 1 LH pad (10):
A.Missing fully or not	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
B.Disbonded	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
C.Break, Crack, Scratch and Color change	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
D.Bubbles	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
E.Permanent strain or Excessive strain	Not serviceable	See repair (Ref. AMM TASK 72-24-03-300-801).
32.Visual inspection of all areas of the strut 1 fairing support (13):
A.Fretting, Erosion or Wear	Not serviceable
33.Visual inspection of area U of the strut 1 fairing support (13):
A.Dents	Any number if not more than 0.023 in. (0.58 mm) in depth
B.Nicks, Scratches or Cracks	Not serviceable
34.Visual inspection of area V of the strut 1 fairing support (13):
A.Dents	Not serviceable
B.Nicks, Scratches or Cracks	Not serviceable
35.Visual examination of replaceable nuts (14) of the strut 1 fairing support (13):
A.Missing	Not serviceable
B.Looseness	Not serviceable
C.Torn wear	Not serviceable

5. Close-up
Subtask 72-24-03-410-061-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 72-24-03-440-056-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-24-03-410-062-A

C. Close Access
(1) 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
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:52:45 UTC