Visual Inspection of the Engine-Fan Fire-Extinguishing Tube-Assembly

TASK 26-21-49-210-001-A
Visual Inspection of the Engine-Fan Fire-Extinguishing Tube-Assembly

ZONE: 430
ZONE: 440

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

REFERENCE	QTY	DESIGNATION
No specific	1	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
430	ENG 1 AIR INTAKE, FAN AND ACCESS GEARBOX
440	ENG 2 AIR INTAKE, FAN AND ACCESS GEARBOX
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 26-21-49-000-003-A	Removal of the Engine Fire-Extinguisher Tube-Assembly
TASK 26-21-49-400-003-A	Installation of the Engine Fire-Extinguisher Tube-Assembly
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
Fire Extinguisher Tube Assembly

3. Job Set-up
Subtask 26-21-49-941-059-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the panel 115VU:

put a WARNING NOTICE(S) to tell persons not to start the engine 1(2).

(2) Make sure that the engine shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the maintenance panel 50VU:

make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off
put a WARNING NOTICE(S).

Subtask 26-21-49-010-062-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-21-49-865-061-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
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41

4. Procedure
Subtask 26-21-49-210-053-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the Fire Extinguisher Tubes Assembly installed on the inlet cowl.

Fire Extinguisher Tube Assembly ** ON A/C NOT FOR ALL

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the fire extinguisher tube assembly, look for:
A.Cracks, splits or kinks.	None permitted.	Replace the tube (Ref. AMM TASK 26-21-49-000-003) and (Ref. AMM TASK 26-21-49-400-003).
B.Wrinkles in bends.	Maximum depth cannot be more than 3 percent of the tube diameter or 0.06 in. (1.5240 mm) which ever is smaller.	If wrinkles are more than the allowable limits, replace the tube (Ref. AMM TASK 26-21-49-000-003) and (Ref. AMM TASK 26-21-49-400-003).
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 26-21-49-000-003) and (Ref. AMM TASK 26-21-49-400-003).
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 26-21-49-000-003) and (Ref. AMM TASK 26-21-49-400-003).
E.Nicks, scratches, chafing.	Maximum depth cannot be more than 10 percent of the wall thickness.	If the damage is more than the allowage limits, replace the tube (Ref. AMM TASK 26-21-49-000-003) and (Ref. AMM TASK 26-21-49-400-003).

5. Close-up
Subtask 26-21-49-410-056-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 26-21-49-865-062-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
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41

[Rev.10 from 2021] 2026.03.31 23:45:20 UTC