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

TASK 30-21-49-200-010-B
Detailed Visual Inspection of the Visible Part of the Inlet-Cowl Anti-Ice Supply-Ducts and Associated Hardware in the Core and Fan Case 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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 437
ZONE: 438
ZONE: 447
ZONE: 448
ZONE: 451
ZONE: 452
ZONE: 461
ZONE: 462

1. Reason for the Job
Refer to the MPD TASK: 302149-I2
DETAILED INSPECTION OF THE VISIBLE PART OF INLET COWL ANTI-ICE SUPPLY DUCTS AND ASSOCIATED HARDWARE IN THE CORE AND FAN CASE COMPARTMENTS.
This task gives the procedure for a detailed visual inspection of the visible part of inlet cowl anti-ice supply-ducts and associated hardware in the engine 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	1	BORESCOPE DIA 6 MM (0.2 IN.) MAX - SIDE VIEW FLEXIBLE
No specific	AR	LIGHT SOURCE - INSPECTION
No specific	AR	MIRROR - INSPECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-002)	cleaning fluid
(Material No.V01-003)	cleaning fluid
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
437	FAN COWL
438	FAN COWL
447	FAN COWL
448	FAN COWL
451	THRUST REVERSER
452	THRUST REVERSER
461	THRUST REVERSER
462	THRUST REVERSER
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. 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 30-21-49-000-806-A	Removal of the Anti-Ice Duct Insulation
TASK 30-21-49-200-804-A	Detailed Visual Inspection of the Engine Anti-Ice Supply-Duct Metallic-Fire-Seals
TASK 30-21-49-290-801-A	Detailed Inspection of the Anti-Ice Pylon Duct
TASK 30-21-49-400-010-B	Installation of the Anti-ice Duct No. 1
TASK 30-21-49-400-806-A	Installation of the Anti-Ice Duct Insulation
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Anti-ice Ducts

3. Job Set-up
Subtask 30-21-49-861-052-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-941-068-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that engine 1(2) shutdown occurred for not less than 5 minutes before you do this procedure.
(3) On 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) in position to tell persons not to energize the FADEC 1(2).

Subtask 30-21-49-865-083-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 30-21-49-010-070-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-040-072-A ** ON A/C NOT FOR ALL

E. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 30-21-49-010-101-A ** ON A/C NOT FOR ALL

F. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
Open thrust reverser halves 451AL and 452AR.
(2) FOR [1000EM2] (ENGINE-2)
Open thrust reverser halves 461AL and 462AR.

Subtask 30-21-49-020-083-A ** ON A/C NOT FOR ALL

G. Remove the insulation on the couplings (4) and (10) and the NAI ducts No 3, 4 and 5 (Ref. AMM TASK 30-21-49-000-806).

4. Procedure
Subtask 30-21-49-110-057-A ** ON A/C NOT FOR ALL

A. Clean the Anti-Ice Duct Assembly

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) or cleaning fluid (Material No.V01-003) to clean the anti-ice duct assembly.
(2) Dry the components with a clean lint-free cloth.

Subtask 30-21-49-210-058-A ** ON A/C NOT FOR ALL

B. Examine the Anti-Ice Duct Assembly for Security of Attachment
(1) Use an LIGHT SOURCE - INSPECTION and MIRROR - INSPECTION to examine these parts for damage, wear and loss of torque:

The attachment nuts and bolts
The couplings (1), (2), (3), (4), (7), (9) and (10)
The NAI duct No 1.

PRE SBE 80-0022
The bearing link assemblies (5), (6) and (8)

END OF PRE SBE 80-0022

POST SBE 80-0022
The turnbuckle link assemblies (5) and (6) and the bearing link assembly (8).

END OF POST SBE 80-0022
data.

(2) If one or more of these parts are damaged, refer to Ref. V2500 CMME PN 2A4412 Tubes, Hoses and Ducts, chapter 30-21-49 Anti-Ice Ducts for permitted damage data.

Subtask 30-21-49-210-059-A ** ON A/C NOT FOR ALL

C. Examine the Anti-Ice Ducts for Signs of Leaks
(1) Examine the inner surfaces of the insulations for signs of leaks:
(a) If you see discoloration marks on the insulation piece:
1 Replace the seal or packing in the coupling joint at that location.
2 Replace the anti-ice duct insulation (Ref. AMM TASK 30-21-49-000-806) and (Ref. AMM TASK 30-21-49-400-806).
(2) Use the LIGHT SOURCE - INSPECTION and MIRROR - INSPECTION to examine all the anti-ice duct connections for signs of leak.
(3) If you see discoloration marks on the coupling joint:
(a) Replace the seal or packing at the coupling joint that you think is unserviceable.
(4) If NAI duct No. 1 at the compressor case joint is discolored or marked:
(a) Examine the bolts for loss of torque (Ref. AMM TASK 30-21-49-400-010). If there is a loss of torque, examine the bolts for damage and wear. Install new or serviceable bolts (Ref. AMM TASK 30-21-49-400-010).

Subtask 30-21-49-210-060-A ** ON A/C NOT FOR ALL

D. Examine the Condition of the Anti-Ice Duct Assembly
(1) Examine the items that follow for cracks.

NAI ducts No 1, 2, 3, 4 and 5
The couplings (1), (2), (3), (4), (7), (9) and (10).

(2) Examine the parts that follow for dents or damage.

The NAI ducts No 1, 2, 3, 4 and 5.

(3) Examine these parts for clear damage.
(a) The couplings (1), (2), (3), (4), (7), (9) and (10).
(4) If one or more of these parts are damaged, refer to Ref. V2500 CMME PN 2A4412 Tubes, Hoses and Ducts, chapter 30-21-49 Anti-Ice Ducts for permitted damage data.

Subtask 30-21-49-210-074-A ** ON A/C NOT FOR ALL

E. Inspection of the Pylon Anti-Ice Duct
(1) In the fire bulkhead area, examine the pylon anti-ice duct (11), the castellated flange and the metallic seals for signs of damage.

Use an MIRROR - INSPECTION or a BORESCOPE DIA 6 MM (0.2 IN.) MAX - SIDE VIEW FLEXIBLE or equivalent, if necessary.

(a) If there is damage on the duct:

Do an inspection of the pylon anti-ice duct (11) (Ref. AMM TASK 30-21-49-290-801).
Refer to DFPRM for permitted damage data.

(b) If there is damage on the castellated flange or on the seals:

Do a visual inspection of the metallic fire seals (Ref. AMM TASK 30-21-49-200-804).

5. Close-up
Subtask 30-21-49-420-084-A ** ON A/C NOT FOR ALL

A. Install the insulation on couplings (4) and (10), and NAI ducts No 3, 4 and 5 (Ref. AMM TASK 30-21-49-400-806).

Subtask 30-21-49-410-068-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)

Close thrust reverser halves 451AL and 452AR.

(b) FOR [1000EM2] (ENGINE-2)

Close thrust reverser halves 461AL and 462AR.

Subtask 30-21-49-440-062-A ** ON A/C NOT FOR ALL

C. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 30-21-49-410-088-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)

Close fan cowls 437AL and 438AR.

(b) FOR [1000EM2] (ENGINE-2)

Close fan cowls 447AL and 448AR.

(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 30-21-49-865-084-A ** ON A/C NOT FOR ALL

E. 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 30-21-49-862-052-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 00:30:07 UTC