Visual Inspection of the Gear Shaft Splines of Radial Shaft (Outer) [CFML]

TASK 72-62-42-210-801-A
Visual Inspection of the Gear Shaft Splines of Radial Shaft (Outer)

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 gear shaft splines of radial shaft (outer).

NOTE: The inspection criteria below are applicable after the removal of the radial shaft (outer) as per (Ref. AMM TASK 72-62-42-000-801).

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	CALIPER
No specific	1	LIGHT SOURCE - INSPECTION
No specific	1	MICROMETER - DIGITAL
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 72-62-42-000-801-A	Removal of the Transfer Gearbox (TGB) Assembly Radial Shaft
Areas to Inspect on the Splines of the Radial Shaft (Outer) with a Radius Scriber
Inside View of the Strut, Outlet Guide Vane 6 with the View of the Radial Shaft (Inner) and the Oil Retainer Ring
Measurement Procedure for the Splines of the Radial Shaft (Outer)

3. Job Set-up
Subtask 72-62-42-941-053-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 72-62-42-010-052-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.

4. Procedure
Subtask 72-62-42-210-050-A

A. Visual Inspection of the Radial Shaft (Outer)

Areas to Inspect on the Splines of the Radial Shaft (Outer) with a Radius Scriber

Inside View of the Strut, Outlet Guide Vane 6 with the View of the Radial Shaft (Inner) and the Oil Retainer Ring

Measurement Procedure for the Splines of the Radial Shaft (Outer)

(1) Remove radial shaft (outer) (3) (Ref. AMM TASK 72-62-42-000-801).
(2) Inspect the gear shaft splines of radial shaft (outer) (3) with a 0.76 mm (0.03 in.) radius scriber after the cleaning of the area:
(a) If no wear is felt with the radius scriber:
1 Radial shaft (outer) (3) is serviceable.
2 With the help of a LIGHT SOURCE - INSPECTION, do a visual inspection of the radial shaft (inner) (1) and oil retainer ring (2) to check any missing/cut element on the oil retainer ring (2).
a If no damage is observed on radial shaft (inner) (1) and oil retainer ring (2), the radial shaft (inner) (1) splines are serviceable.
b If the oil retainer ring (2) is damaged (any amount), replacement of radial shaft (inner) (1) is required within 400 engine flight hours.
(b) If the wear is felt with the radius scriber, calculate the depth P1 of the wear using the following procedure:
1 Use a MICROMETER - DIGITAL or CALIPER between 6 spline teeth of the radial shaft (outer) (3).
a Measure M1 distance over 6 spline teeth on the area without wear close to the end of the shaft.
b Measure M2 distance over 6 spline teeth between one quarter and three quarter of the area with wear.
c Calculate the depth on the wear: P1 = M1 - M2.
d Repeat the instructions given from Para 4.A.(2) (b) 1_ a_ to Para 4.A.(2) (b) 1_ c_ on 4 teeth at 90 degrees from each other (tooth no. 1, 10, 19, 28).
e Report in table 1 the maximum wear depth P1 measured.
2 Do the following procedure according to the maximum wear depth found in table 1:
If any wear is observed, both radial shaft (outer) (3) and radial shaft (inner) (1) need to be removed and replaced within the time period indicated in table 2. Please note that the radial shaft (inner) (1) replacement can be done during shop visit only.

	M2 (mm) Area with wear	P1=M1-M2 (mm) Wear depth
Tooth no. 1
Tooth no. 10
Tooth no. 19
Tooth no. 28
	Maximum wear depth=	Report maximum value

Table - Measurements form for the gear shaft splines of the radial shaft (outer) (3)

Scenario	Maximum wear depth is:	Replacement of current radial shaft (outer) (3) and radial shaft (inner) (1)
1	< 0.04 mm (0.0016 in.)	In 400 engine flight hours
2	≥ 0.04 mm (0.0016 in.) and < 0.07 mm (0.0028 in.)	In 200 engine flight hours
3	≥ 0.07 mm (0.0028 in.) and < 0.10 mm (0.004 in.)	In 50 engine flight hours
4	≥ 0.10 mm (0.004 in.) and < 0.12 mm (0.0047 in.)	In 2 engine cycles
5	≥ 0.12 mm (0.0047 in.)	Without delay.

Table - Replacement scenario

5. Close-up
Subtask 72-62-42-410-051-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) 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.
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:54:41 UTC