Visual Check of Engine Anti Icing Ducts

TASK 30-21-49-200-806-A
Visual Check of Engine Anti Icing Ducts

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 2M (6 FT) - ADJUSTABLE
No specific	1	FLASHLIGHT
No specific	1	MIRROR - INSPECTION
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 30-21-11-000-801-A	Removal of the Nacelle Anti-Ice (NAI) Pressure Sensors and Sense Lines
TASK 30-21-11-400-801-A	Installation of the Nacelle Anti-Ice (NAI) Pressure Sensors and Sense Lines
TASK 30-21-49-000-808-A	Removal of the Anti-Ice Ducts and Insulation Blankets
TASK 30-21-49-400-808-A	Installation of the Anti-Ice Ducts and Insulation Blankets
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 71-60-42-000-802-A	Removal of the Air Intake Cowl Anti-Ice Door
TASK 71-60-42-400-802-A	Installation of the Air Intake Cowl Anti-Ice Door
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
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
Engine Anti Icing Ducts
Anti-Ice Valves (PRSOV1 and PRSOV2)
NAI Door

3. Job Set-up
Subtask 30-21-49-941-120-A

A. Safety Precautions
(1) On the center pedestal, on the [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 the [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 30-21-49-010-175-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) Remove the air intake cowl anti-ice door (Ref. AMM TASK 71-60-42-000-802).

Subtask 30-21-49-040-102-A

C. Deactivation of the Thrust Reverser System for Ground 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 78-30-00-040-807).

Subtask 30-21-49-010-176-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.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure
Subtask 30-21-49-220-073-A

A. Inspection
(1) Do a visual inspection of the engine anti-icing ducts.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the ducts for:
A.Cracks	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
B.Dents	Depth must not be more than 4.45 mm (0.18 in.).	If damaged more than the maximum serviceable limits, then replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
C.Nicks, scratches, chafing or scores	Depth must not be more than 0.05 mm (0.002 in.) after the removal of the high metal by filing.	If damaged more than the maximum serviceable limits, then replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
2.Examine the support flanges that are welded to the ducts for:
A.Cracks	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
B.Broken or missing material	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
C.Disconnected from the tube	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
D.Wear	Any amount, 0.08 mm (0.003 in.) in depth.	If damaged more than the maximum serviceable limits, then replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
3.Examine the coupling nuts of the attached indicating tubes for:
A.Cracks	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-11-000-801) and (Ref. AMM TASK 30-21-11-400-801).
4.Examine long PT1 indicating tubes and short PT2 indicating tube for:
A.Cracks	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-11-000-801) and (Ref. AMM TASK 30-21-11-400-801).
B.Dents	Depth must not be more than 0.97 mm (0.04 in.).	If damaged more than the maximum serviceable limits, then replace (Ref. AMM TASK 30-21-11-000-801) and (Ref. AMM TASK 30-21-11-400-801).
C.Nicks, scratches, chafing or scores	Depth must not be more than 0.036 mm (0.0014 in.) after the removal of the high metal by filing.	If damaged more than the maximum serviceable limits, then replace (Ref. AMM TASK 30-21-11-000-801) and (Ref. AMM TASK 30-21-11-400-801).
5.Examine the insulation blankets and the insulation boots on the fan compartment duct and the core compartment duct for:
A.Tears, missing straps and missing material	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
B.Dents permissible for any depth.
C.Nicks, scratches, chafing or scores	Depth must not be more than 0.05 mm (0.002 in.) after the removal of the high metal by filling.	If damaged more than the maximum serviceable limits, then replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
6.Examine the V-band clamps, the coupling bands and the retaining straps for:
A.Cracks	Not serviceable.	If damaged, replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
7.Make sure that the Pressure Regulating Shut-Off Valve (PRSOV) 1, PRSOV2 and its attached fittings are in the correct condition.		If needed, correct the position (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
8.Make sure that the ducting has no obvious damage or signs of leak and no burned area on the adjacent surface.		If damaged, replace (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
9.Make sure that the clamps are correctly installed.		If needed, correct the position (Ref. AMM TASK 30-21-49-000-808) and (Ref. AMM TASK 30-21-49-400-808).
10.Inspect the injector and the Nacelle Anti-Icing (NAI) nozzle through the NAI holes to any fracture of the injector or obvious cracks (use a FLASHLIGHT and a MIRROR - INSPECTION if necessary).		If damaged, contact SAFRAN Nacelles.

NOTE: The aft NAI valve is known as PRSOV1.

NOTE: The forward NAI valve is known as PRSOV2.

5. Close-up
Subtask 30-21-49-410-145-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.
(3) Install the air intake cowl anti-ice door (Ref. AMM TASK 71-60-42-400-802).

Subtask 30-21-49-440-083-A

B. Reactivation of the Thrust Reverser System after Ground Maintenance
(1) Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 30-21-49-410-146-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 00:30:16 UTC