Installation of the Middle Anti-ice Duct

TASK 30-21-49-400-045-A
Installation of the Middle Anti-ice Duct

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	AR	HAMMER - FIBER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 70 and 50 lbf.in (0.79 and 0.57 m.daN )
No specific	Torque wrench: range to between 85 and 70 lbf.in (0.96 and 0.79 m.daN )

B. Work Zones and Access Panels

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

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
25	SEAL	AIPC 30-21-49-01-130

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 30-21-49-790-803-A	Leak Test of the Nacelle Anti-Ice Supply Ducts, Muscle Pressure Tubes and Hoses With the Engine in Operation
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Core Anti-ice Ducts

3. Job Set-up
Subtask 30-21-49-860-065-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(3) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(4) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position.

Subtask 30-21-49-010-060-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 30-21-49-040-055-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 30-21-49-865-059-A ** ON A/C NOT FOR ALL

D. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	ANTI ICE/ENG/2	1DN2	W10
122VU	ANTI ICE/ENG/1	1DN1	X10

4. Procedure
Subtask 30-21-49-210-052-A ** ON A/C NOT FOR ALL

A. Examine the seals (25) to make sure that they are serviceable.

Subtask 30-21-49-420-051-A ** ON A/C NOT FOR ALL

B. Installation of the Middle Anti-Ice Duct:
(1) Remove the blanking plugs from the anti-ice ducts.
(2) Put the middle anti-ice duct (35) in position. Install the four bolts (40), washers (45), and nuts (50) that attach the middle anti-ice duct (35) to the fireshield. Do not torque the nuts at this time.
(3) Connect the middle anti-ice duct:

CAUTION: MAKE SURE THE SMOOTH CIRCULAR SURFACE OF THE COUPLING IS RADIALLY OUTBOARD FROM THE ENGINE. DO NOT LET THE COUPLING TOUCH ENGINE COMPONENTS OR STRUCTURE. DAMAGE TO THE COMPONENTS OR STRUCTURE COULD OCCUR.

(a) Connect the middle anti-ice duct (35) to the top anti-ice duct (15). Use the coupling (20) and a AIPC 30-21-49-01-130 SEAL (25). Tighten the coupling sufficiently to hold the anti-ice duct in position.
(4) Connect the middle anti-ice duct:

(a) Connect the middle anti-ice duct (35) to the forward anti-ice duct (30), use the coupling (20) and a serviceable seal (25). Tighten the coupling sufficiently to hold the anti-ice duct in position.
(5) Make sure that the middle anti-ice duct (35) is in the correct position.
(6) TORQUE the four bolts (40) to between 70 and 50 lbf.in (0.79 and 0.57 m.daN )

.
(7) TORQUE the nut on the coupling (20) as follows:
(a) TORQUE the coupling nut to between 85 and 70 lbf.in (0.96 and 0.79 m.daN )

.
(b) Lightly hit the perimeter of the coupling in several places. Use a HAMMER - FIBER, not a metal hammer.
(c) Do steps (a) and (b) above two more times. Then do step (1) again.

Subtask 30-21-49-790-071-A ** ON A/C NOT FOR ALL

C. Leak Test
(1) Do the leak test of the middle anti-ice duct with the engine in operation (Ref. AMM TASK 30-21-49-790-803).

5. Close-up
Subtask 30-21-49-410-055-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 thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 30-21-49-440-053-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-410-059-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 30-21-49-865-060-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
122VU	ANTI ICE/ENG/2	1DN2	W10
122VU	ANTI ICE/ENG/1	1DN1	X10

Subtask 30-21-49-862-057-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 00:29:28 UTC