Detailed Check of the Anti-Ice Interbulkhead System with Component Removal

TASK 30-21-49-200-013-B
Detailed Check of the Anti-Ice Interbulkhead System with Component Removal

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.

1. Reason for the Job
This task is for V2500-A5 engines.
This task gives the procedure for detailed check of the anti-ice interbulkhead system with component removal.
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	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-076)	Methyl Ethyl Ketone, Technical grade
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 30-21-49-000-015-A	Removal of the Anti-Ice Interbulkhead System
TASK 30-21-49-400-015-A	Installation of the Anti-Ice Interbulkhead System
TASK 71-11-11-000-010-B	Removal of the Air Intake Cowl
TASK 71-11-11-400-010-B	Installation of the Air Intake Cowl
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)
Anti-Ice Interbulkhead System

3. Job Set-up
Subtask 30-21-49-941-088-A ** ON A/C NOT FOR ALL

A. 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 1(2).

Subtask 30-21-49-010-115-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(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 30-21-49-020-070-A ** ON A/C NOT FOR ALL

C. Remove the anti-ice interbulkhead system (Ref. AMM TASK 30-21-49-000-015).

Subtask 30-21-49-110-067-A ** ON A/C NOT FOR ALL

D. Clean the Inner and Outer Ducts and their Related Components

Anti-Ice Interbulkhead System ** ON A/C NOT FOR ALL

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 V01-076Methyl Ethyl Ketone, Technical grade, to clean these components:
(a) The outer duct (43).
(b) The end fitting (44).
(c) The D-ring (45).
(d) The inner duct (46).
(e) The housing (47).
(f) The seal carrier (48).
(g) The D-ring (49).
(h) The end fitting (50).
(i) The 3-ring pack (51).
(j) The seal housing (52).
(k) The D-ring (53).
(l) The vee-flange (54).
(2) Dry the components with a clean Textile-Lint free Cotton - (Material No.14SBA1) .

4. Procedure
Subtask 30-21-49-220-062-A ** ON A/C NOT FOR ALL

A. Examine the Outer Duct (43)
(1) Measure the thickness of the skin on the outer duct (43):
(a) If it is a minimum thickness of 0.025 in. (0.64 mm), accept the damage.
(b) If it is less than 0.025 in. (0.64 mm) thick, reject the outer duct (43).

Subtask 30-21-49-220-063-A ** ON A/C NOT FOR ALL

B. Examine the Vee-Flange Fitting (54) in the Outer Duct (43)
(1) Measure the dimension H:
(a) If dimension H is a minimum thickness of 0.123 in. (3.12 mm), accept the damage.
(b) If dimension H is less than 0.123 in. (3.12 mm), reject the outer duct (43).
(2) Measure the dimension K of the pin (55) in the vee-flange fitting (54):
(a) If dimension K is a minimum diameter of 0.085 in. (2.16 mm), this is permitted for a fly-on limit. Replace the pin (55) at the next maintenance visit, before 36 months, 12000 flight hours or 8000 flight cycles, whichever occurs first.
(b) If dimension K is a minimum diameter of 0.127 in. (3.23 mm), accept the damage.
(c) If the pin (55) is missing it must be replaced.

Subtask 30-21-49-220-064-A ** ON A/C NOT FOR ALL

C. Examine the Seal Housing (52) on the Outer Duct (43)
(1) Measure the dimension L:
(a) If dimension L is a minimum thickness of 0.202 in. (5.13 mm), accept the damage.
(b) If dimension L is less than 0.202 in. (5.13 mm), reject the outer duct (43).
(2) Measure the dimension M:
(a) If dimension M is a minimum thickness of 0.038 in. (0.97 mm), accept the damage.
(b) If dimension M is between 0.030 in. (0.76 mm) and 0.038 in. (0.97 mm), this is permitted only for a fly-on limit. Replace the outer duct (43) at the next maintenance visit, before 6 months, 1000 flight hours or 1000 flight cycles, whichever occurs first.
(c) If dimension M is less than 0.030 in. (0.76 mm), reject the outer duct (43).
(3) Measure the dimension N:
(a) If dimension N is a minimum thickness of 0.204 in. (5.18 mm), accept the damage.
(b) If dimension N is less than 0.204 in. (5.18 mm), reject the outer duct (43).
(4) Measure the dimension P:
(a) If dimension P is a minimum thickness of 0.124 in. (3.15 mm), accept the damage.
(b) If dimension P is less than 0.124 in. (3.15 mm), reject the outer duct (43).

Subtask 30-21-49-220-065-A ** ON A/C NOT FOR ALL

D. Examine the Inner Duct (46)
(1) Measure the thickness of the skin on the inner duct (46):
(a) If it is a minimum thickness of 0.026 in. (0.66 mm), accept the damage.
(b) If it is less than 0.026 in. (0.66 mm) thick, reject the inner duct (46).

Subtask 30-21-49-220-066-A ** ON A/C NOT FOR ALL

E. Examine the End Fittings (44) and (50) on the Inner Duct (46)
(1) Measure the wall thickness of the end fittings:
(a) If it is a minimum thickness of 0.069 in. (1.75 mm), accept the damage.
(b) If it is less than 0.069 in. (1.75 mm) thick, reject the inner duct (46).
(2) Measure the dimension R on the inner duct (46):
(a) If dimension R is a minimum thickness of 0.038 in. (0.97 mm), accept the damage.
(b) If dimension R is between 0.030 in. (0.76 mm) and 0.038 in. (0.97 mm), this is permitted only for a fly-on limit. Replace the inner duct (46) at the next maintenance visit, before 6 months, 1000 flight hours or 1000 flight cycles, whichever occurs first.
(3) Measure the dimension S:

NOTE: If the end fitting (44) is not satisfactory and the end fitting (50) is satisfactory, you can install the inner duct (46) in the opposite direction. Ref Inlet Cowl CMM - Repair VRS2782.

(a) If dimension S is less than 0.250 in. (6.35 mm), accept the damage.
(b) If dimension S is between 0.250 in. (6.35 mm) and 0.375 in. (9.53 mm), replace the inner duct (46) at the next maintenance visit, before 36 months, 12000 flight hours or 8000 flight cycles, whichever occurs first.
(c) If dimension S is more than 0.375 in. (9.53 mm), reject the inner duct (46).

Subtask 30-21-49-220-067-A ** ON A/C NOT FOR ALL

F. Examine the Housing (47) at the Forward Bulkhead
(1) Measure the wall thickness of the housing:
(a) If it is a minimum thickness of 0.074 in. (1.88 mm), accept the damage.
(b) If it is less than 0.074 in. (1.88 mm), reject the inlet cowl.

Subtask 30-21-49-220-068-A ** ON A/C NOT FOR ALL

G. Examine the Seal Carrier (48) at the Forward Bulkhead
(1) If wear is on more than 50% of the circumference of the seal carrier (48), measure the dimensions that follow:
(a) Dimension T:
1 If dimension T is a minimum thickness of 0.030 in. (0.76 mm), accept the damage.
2 If dimension T is less than 0.030 in. (0.76 mm) thick, replace the air intake cowl (Ref. AMM TASK 71-11-11-000-010) and (Ref. AMM TASK 71-11-11-400-010).
(b) Dimension U:
1 If dimension U is a minimum thickness of 0.088 in. (2.24 mm), accept the damage.
2 If dimension U is less than 0.088 in. (2.24 mm) thick, replace the air intake cowl (Ref. AMM TASK 71-11-11-000-010) and (Ref. AMM TASK 71-11-11-400-010).
(c) Dimension V:
1 If dimension V is a minimum thickness of 0.153 in. (3.89 mm), accept the damage.
2 If dimension V is less than 0.153 in. (3.89 mm) thick, replace the air intake cowl (Ref. AMM TASK 71-11-11-000-010) and (Ref. AMM TASK 71-11-11-400-010).
(2) If wear is on less than 50% of the circumference of the seal carrier (48), measure the dimensions that follow:
(a) Dimension T with the D-ring (49) missing:
1 If dimension T is a minimum thickness of 0.030 in. (0.76 mm), accept the damage.
2 If dimension T is less than 0.030 in. (0.76 mm) thick, install a new D-ring (49).
(b) Dimension T with the D-ring (49) installed:
1 Dimension T is permitted to be completely worn away.
(c) Dimension U with the D-ring (49) missing:
1 If dimension U is a minimum thickness of 0.088 in. (2.24 mm), accept the damage.
2 If dimension U is between 0.026 in. (0.66 mm) and 0.088 in. (2.24 mm) thick, install a new D-ring (49).
3 If dimension U is less than 0.026 in. (0.66 mm) thick, replace the air intake cowl (Ref. AMM TASK 71-11-11-000-010) and (Ref. AMM TASK 71-11-11-400-010).
(d) Dimension U with the D-ring (49) installed:
1 If dimension U is a minimum thickness of 0.026 in. (0.66 mm), accept the damage.
2 If dimension U is less than 0.026 in. (0.66 mm) thick, replace the air intake cowl (Ref. AMM TASK 71-11-11-000-010) and (Ref. AMM TASK 71-11-11-400-010).
(e) Dimension V with the D-ring (49) missing:
1 If dimension V is a minimum thickness of 0.118 in. (3.00 mm), accept the damage.
2 If dimension V is between 0.026 in. (0.66 mm) and 0.118 in. (3.00 mm) thick, install a new D-ring (49).
3 If dimension V is less than 0.026 in. (0.66 mm) thick, replace the air intake cowl (Ref. AMM TASK 71-11-11-000-010) and (Ref. AMM TASK 71-11-11-400-010).
(f) Dimension V with the D-ring (49) installed:
1 If dimension V is a minimum thickness of 0.026 in. (0.66 mm), accept the damage.
2 If dimension V is less than 0.026 in. (0.66 mm) thick, replace the air intake cowl (Ref. AMM TASK 71-11-11-000-010) and (Ref. AMM TASK 71-11-11-400-010).

Subtask 30-21-49-220-069-A ** ON A/C NOT FOR ALL

H. Examine the 3-Ring Pack (51)
(1) Measure the dimension W:
(a) If dimension W is a minimum of 0.048 in. (1.22 mm), this is permitted for a fly-on limit. Replace the 3-ring pack at the next maintenance visit, before 36 months, 12000 flight hours or 8000 flight cycles, whichever occurs first.
(b) If dimension W is a minimum thickness of 0.053 in. (1.35 mm), accept the damage.

Subtask 30-21-49-220-070-A ** ON A/C NOT FOR ALL

I. Examine the D-Rings (45), (49) and (53)
(1) Measure the dimension X:
(a) If dimension X is a minimum thickness of 0.048 in. (1.22 mm), this is permitted for a fly-on limit. Replace the D-ring at the next maintenance visit, before 36 months, 12000 flight hours or 8000 flight cycles, whichever occurs first.
(b) If dimension X is a minimum thickness of 0.053 in. (1.35 mm), accept the damage.

5. Close-up
Subtask 30-21-49-420-077-A ** ON A/C NOT FOR ALL

A. Install the anti-ice interbulkhead system (Ref. AMM TASK 30-21-49-400-015).

Subtask 30-21-49-941-089-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(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).

[Rev.10 from 2021] 2026.04.01 00:30:09 UTC