Visual Inspection of the Fuel Return Valve Hose Assembly [CFMI]

TASK 73-11-48-210-040-A
Visual Inspection of the Fuel Return Valve Hose Assembly

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	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 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
TASK 73-11-48-000-040-A	Removal of the Fuel Return Valve Hose
TASK 73-11-48-400-040-A	Installation of the Fuel Return Valve Hose
Fuel Return Valve Hose Assembly

3. Job Set-up
Subtask 73-11-48-941-054-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 73-11-48-010-055-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.

4. Procedure
Subtask 73-11-48-210-051-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the fuel return valve hose.

Fuel Return Valve Hose Assembly ** ON A/C NOT FOR ALL

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the fuel return valve hose assembly, look for:
A.Cracks	None permitted	If cracks are found, replace the hose (Ref. AMM TASK 73-11-48-000-040) and (Ref. AMM TASK 73-11-48-400-040).
B.Crimps	None permitted	Replace the hose (Ref. AMM TASK 73-11-48-000-040) and (Ref. AMM TASK 73-11-48-400-040).
C.Cuts, tears on fire sleeve	Maximum depth must be less than one half of the sleeve thickness. Any number permitted.	If the damage is more than the allowable limits replace the hose (Ref. AMM TASK 73-11-48-000-040) and (Ref. AMM TASK 73-11-48-400-040).
D.Internal blockage	None permitted	If blockage is found remove the blockage or replace the hose (Ref. AMM TASK 73-11-48-000-040) and (Ref. AMM TASK 73-11-48-400-040).
E.Leakage	None permitted	Replace the hose (Ref. AMM TASK 73-11-48-000-040) and (Ref. AMM TASK 73-11-48-400-040). 2.Examine the fittings on the two ends of the hoses, 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 73-11-48-000-040) and (Ref. AMM TASK 73-11-48-400-040).
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 73-11-48-000-040) and (Ref. AMM TASK 73-11-48-400-040).
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.

5. Close-up
Subtask 73-11-48-410-053-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).

[Rev.10 from 2021] 2026.04.01 02:55:38 UTC