Visual Inspection of the Exhaust Tube [CFML]

TASK 72-59-83-210-802-A
Visual Inspection of the Exhaust Tube

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
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 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, 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 72-59-83-000-801-A	Removal of the Center Ventilation Tube
TASK 72-59-83-400-801-A	Installation of the Center Ventilation Tube
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
Visual Inspection of the Exhaust Tube

3. Job Set-up
Subtask 72-59-83-941-053-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 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 72-59-83-010-056-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 72-59-83-040-053-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 maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-59-83-010-057-A

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

4. Procedure
Subtask 72-59-83-210-051-A

A. Visual Inspection of the Exhaust Tube (1)
(1) Remove the center ventilation tube (Ref. AMM TASK 72-59-83-000-801).
(2) Do the visual inspection of all areas:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Cracks	Not serviceable.
Nicks, scratches	Any length, if not more than 0.005 in. (0.13 mm) in depth.
Dents	Any length, if not more than 0.05 in. (1.27 mm) in depth.
Cracks in weld	No serviceable.
Coking	Any amount if the forward section of the exhaust tube is not plugged over 10 percent of area.

(3) Do the visual inspection of the flange (2):

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Cracks	Not serviceable.
Nicks, scratches face J	Any length, if not more than 0.010 in. (0.25 mm) in depth.
Fretting on mating face	Any amount if the dimension F is between 0.091 in. (2.31 mm) and 0.106 in. (2.69 mm).
Fretting on the locating diameter G	Not serviceable.

(4) Do the visual inspection of the centering diameter E (3):

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Rub on diameter E	Any amount if the diameter E is between 2.95 in. (74.93 mm) and 2.961 in. (75.21 mm).
Scratches on diameter E	Any amount if the diameter E is between 2.95 in. (74.93 mm) and 2.961 in. (75.21 mm).
Nicks, scores, scratches in area H	Not serviceable.

(5) Install the center ventilation tube (Ref. AMM TASK 72-59-83-400-801).

5. Close-up
Subtask 72-59-83-410-054-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 72-59-83-440-052-A

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

Subtask 72-59-83-410-055-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 02:54:21 UTC