Visual Inspection of the Anti-Ice System Hoses, Tubes and Ducts

TASK 30-21-49-210-040-A
Visual Inspection of the Anti-Ice System Hoses, Tubes and Ducts

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)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 30-21-49-000-043-A	Removal of the Muscle Pressure Tubes and Hoses
TASK 30-21-49-000-044-A	Removal of the Forward Anti-ice Duct
TASK 30-21-49-000-045-A	Removal of the Middle Anti-ice Duct
TASK 30-21-49-000-046-A	Removal of the Top Anti-ice Duct
TASK 30-21-49-400-043-A	Installation of the Muscle Pressure Tubes and Hoses
TASK 30-21-49-400-044-A	Installation of the Forward Anti-ice Duct
TASK 30-21-49-400-045-A	Installation of the Middle Anti-ice Duct
TASK 30-21-49-400-046-A	Installation of the Top Anti-ice Duct
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
Anti-Ice System Tubes, Hoses and Ducts
Anti-Ice System Tubes, Hoses and Ducts

3. Job Set-up
Subtask 30-21-49-941-081-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 1(2)
(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 30-21-49-010-109-A ** ON A/C NOT FOR ALL

B. 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 1M(3 FT) in position.

Subtask 30-21-49-865-077-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
122VU	ANTI ICE/ENG/2	1DN2	W10
122VU	ANTI ICE/ENG/1	1DN1	X10

4. Procedure
Subtask 30-21-49-210-066-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the anti-ice system hoses, tubes and ducts.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the muscle pressure line hose assemblies, look for:
A.Broken Wire Braids.	Maximum of 3 broken wires per plait. No more than 6 broken wires in an assembly. No more than 6 broken wires in each 1 ft. (0.30 m) of hose.	If the damage is more than the allowable limits, replace the hose (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
B.Cracks.	None permitted.	If cracks are found, replace the hose (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
C.Crimps.	None permitted.	Replace the hose assembly (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
D.Internal blockage.	None permitted.	If blockage is found remove the blockage or replace the hose (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
E.Leakage.	None permitted.	Replace the hose (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
2.Examine the fittings on the two ends of the hose, look for:
A.Thread damage.	Damage is permitted if the threads that are good are not reduced by more than one thread.	If the damage is more than the allowable limits, replace the hose (Ref. AMM TASK 30-21-49-000-044) and (Ref. AMM TASK 30-21-49-400-044).
B.Damaged flats.	Damage is permitted if the end fittings can keep the correct torque value.	If the end fittings can not keep the correct torque replace the hose (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
C.Safety wire hole damaged or worn.	Damage is permitted if the metal around the hole is not cracked or torn. One undrilled corner must remain.	Blend out damage. If necessary drill a hole in the undrilled corner. The new hole must be the same diameter and distance from the end of the nut as the old hole.
3.Examine the muscle pressure line forward and aft tube assemblies, look for:
A.Cracks, splits or kinks.	None permitted.	Replace the tube (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
B.Wrinkles in bends.	Maximum depth cannot be more than 3 percent of the tube diameter or 0.060 in. (1.52 mm) which ever is smaller.	If wrinkles are more than the allowable limits, replace the tube (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
C.Dents.	Maximum depth cannot be more than 10 percent of the tube outside diameter. Maximum radius must be less than 2 times the wall thickness. Maximum of 2 dents for each 1 ft. (0.30 m) of tube length.	If the dents are more than the allowable limits, replace the tube (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
D.Flat areas.	Maximum flat area cannot be more than 2 times the tube outside diameter. The contour change cannot be more than 10 percent of the tube outside diameter.	If the flat areas are more than the allowable limits, replace the tube (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
E.Nicks, scratches, chafing.	Maximum depth cannot be more than 10 percent of the wall thickness.	If the damage is more than the allowable limits, replace the tube (Ref. AMM TASK 30-21-49-000-043) and (Ref. AMM TASK 30-21-49-400-043).
4.Examine the anti-ice system forward duct airgap insulation, look for:
A.Nick, scratch, gouge.	1 in. (25.4 mm) maximum length. 0.020 in. (0.508 mm) maximum depth. 0.200 in. (5.080 mm) maximun width. 10 in. (254 mm) minimum separation from other damage. Maximum 3 per duct.	If the damage is more than the AMM permitted limits, replace the duct (Ref. AMM TASK 30-21-49-000-044) and (Ref. AMM TASK 30-21-49-400-044). Send damaged duct to shop for analysis.
5.Examine the anti-ice system middle duct airgap insulation, look for:
A.Nick, scratch, gouge.	1 in. (25.4 mm) maximum length. 0.020 in. (0.508 mm) maximum depth. 0.200 in. (5.08 mm) maximum width. 10 in. (254 mm) minimum separation from other damage. Maximum 3 per duct.	If the damage is more than the AMM permitted limits, replace the duct (Ref. AMM TASK 30-21-49-000-045) and (Ref. AMM TASK 30-21-49-400-045). Send damaged duct to shop for analysis.
6.Examine the anti-ice system upper duct, look for:
A.Wrinkles in bends.	Maximum depth must be less than 5 percent of the duct diameter.	If the damage is more than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-046) and (Ref. AMM TASK 30-21-49-400-046).
B.Dents.	Maximum depth must be less than 20 percent of the tube outside diameter. Maximum radius of the dent must be less than 2 times the duct wall thickness. Maximum of 4 dents per each 1 ft. (0.30 m) of duct. Minimum distance of 1 in. (25.4 mm) between dents. No limit to dents allowed except in bends, no dents are allowed in bends.	If the dents are less than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-046) and (Ref. AMM TASK 30-21-49-400-046). Send damaged duct to shop for analysis. If the dents are more than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-046) and (Ref. AMM TASK 30-21-49-400-046).
C.Flat areas.	Maximum length must be less than 3 times the outside diameter of the duct. Contour change must be less than 20 percent of the outside diameter of the duct.	If the flat areas are less than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-046) and (Ref. AMM TASK 30-21-49-400-046) Send damaged duct to shop for analysis. If the flat areas are more than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-046) and (Ref. AMM TASK 30-21-49-400-046).
D.Nicks, scratches, chafing in straight section.	Maximum depth must be less than 10 percent of the wall thickness of the duct. There is no limit to the number of nicks, scratches or chafing allowed in the straight section of the duct.	If the damage is less than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-046) and (Ref. AMM TASK 30-21-49-400-046). Send damaged duct to shop for analysis. If the damage is more than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-046) and (Ref. AMM TASK 30-21-49-400-046).
E.Nicks, scratches, chafing in bends.	Maximum depth must be less than 10 percent of the wall thickness of the duct.	If the damage is less than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-044) and (Ref. AMM TASK 30-21-49-400-044). Send damaged duct to shop for analysis. If the damage is more than the allowable limits, replace the duct (Ref. AMM TASK 30-21-49-000-044) and (Ref. AMM TASK 30-21-49-400-044).
F.Splits, cracks, kinks	Maximun length must be less than the duct outside diameter (OD). Maximun length same as or more than the duct outside diameter (OD).	If the damage is less than the duct OD, replace the duct (Ref. AMM TASK 30-21-49-000-044) and (Ref. AMM TASK 30-21-49-400-044). Send the duct to shop for weld repair. If the damage is the same as or more than the duct OD, replace the duct (Ref. AMM TASK 30-21-49-000-044) and (Ref. AMM TASK 30-21-49-400-044). Send the duct to shop to do the doubler and section repair.

5. Close-up
Subtask 30-21-49-410-096-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 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
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 30-21-49-865-078-A ** ON A/C NOT FOR ALL

B. 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

[Rev.10 from 2021] 2026.04.01 00:30:05 UTC