Detailed Inspection of Inlet Cowl Anti-Ice Supply Ducts and Associated Hardware in the Core and Fan Compartments

TASK 30-21-49-200-001-A
Detailed Inspection of Inlet Cowl Anti-Ice Supply Ducts and Associated Hardware in the Core and Fan Compartments

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: 438
ZONE: 448

1. Reason for the Job
Refer to the MPD TASK: 302149-C1
DETAILED INSPECTION OF INLET COWL ANTI-ICE SUPPLY DUCTS AND ASSOCIATED HARDWARE IN THE CORE AND FAN COMPARTMENTS.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
438	FAN COWL
448	FAN COWL
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Anti-Ice System Tubes, Hoses, and Ducts

3. Job Set-up
Subtask 30-21-49-861-050-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 30-21-49-941-050-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC system 1(2).
(4) On the ANTI ICE section of the panel 25VU:

make sure that the ON legend of the ENG1(2) pushbutton switch is off.

Subtask 30-21-49-865-050-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 1000EM2 (ENGINE2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-49-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 30-21-49-040-050-A ** ON A/C NOT FOR ALL

E. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 30-21-49-010-051-A ** ON A/C NOT FOR ALL

F. Open the right thrust reverser cowl door (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR

4. Procedure
Subtask 30-21-49-210-050-A ** ON A/C NOT FOR ALL

A. Inspection/Check of the Engine Air-Intake Ice-Protection

Anti-Ice System Tubes, Hoses, and Ducts ** ON A/C NOT FOR ALL

(1) Examine the anti ice valve and make sure that:

The anti ice valve and its attach fittings are in the correct condition and is satisfactorily clean.
The electrical connector is correctly connected and is in the correct condition.

(2) Examine the electrical harness to make sure that it is clean and is in the correct external condition.
(3) Make sure that the electrical harness has no:

Wear
Signs of overheat
Scaling of the insulation
Damage that can change its properties.

(4) Make sure that you do not find damage and signs of leaks or cracks on the duct.
(5) Make sure that the black coating of the duct is not damaged (scratches and missing coating on the bracket are permitted).
(6) Make sure that you do not find damage and signs of leaks or cracks on the motive-pressure regulation line.
(7) Make sure that the clamps are correctly installed.
(8) Make sure that the clamp mounts have no cracks.

5. Close-up
Subtask 30-21-49-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust reverser cowl door (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 30-21-49-440-050-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 30-21-49-410-084-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 30-21-49-865-051-A ** ON A/C NOT FOR ALL

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 1000EM2 (ENGINE2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-49-862-050-A ** ON A/C NOT FOR ALL

E. De-energize the ground service network (Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 00:30:01 UTC