Visual Inspection of the Oil System Hose and Tubes [CFMI]

TASK 79-20-00-210-001-A
Visual Inspection of the Oil System Hose and Tubes

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 79-20-00-000-001-A	Removal of the Oil System Tubes and Hoses
TASK 79-20-00-400-001-A	Installation of the Oil System Tubes and Hoses
CMM 710017	(for corrective action)
Oil System Tubes
Oil System Hoses

3. Job Set-up
Subtask 79-20-00-941-052-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 79-20-00-010-060-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 79-20-00-210-059-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection of the Oil System Tubes and Hose Assemblies

(1) Do a visual inspection of the oil system tubes and hose assemblies as follows:

Oil System Tubes ** ON A/C NOT FOR ALL

Oil System Hoses ** ON A/C NOT FOR ALL

NOTE: Oil system tubes and hose assemblies that are removed due to damage may be sent to the shop for repair, review and possible return to service CMM 710017.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the oil system tubes, look for:
A.Cracks, splits, kinks	Length must not be more than 2 times the outside diameter of the tube.	If damage is less than the allowable limits, repair the tube at next 750 Flight Hours / 750 Flight Cycles / 4 calendar months (whichever the earliest). If the damage is more than the allowable limits, replace the tube (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001).
B.Dents	Maximum depth must be less than 20 percent of the tube outside diameter. Maximum radius is not less than 2 times the wall thickness of the tube. Maximum of 6 dents for each 1 foot (305 mm) length of tube.	If the dent is less than the allowable limits, then repair the dent at next 750 Flight Hours / 750 Flight Cycles / 4 calendar months (whichever the earliest). If the dent is more than the allowable limits, replace the tube (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001). There is no limit to the number of dents allowed, but they must be less than the allowable limits.
C.Flat areas	Maximum length must be less than 3 times the outside diameter of the tube. Contour change must be less than 20 percent of the outside diameter of the tube.	If flat area is less than the allowable limits, repair the tube at next 750 Flight Hours / 750 Flight Cycles / 4 calendar months (whichever the earliest). If the flat area is more than the allowable limits, replace the tube (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001). There is no limit to the number of flat areas allowed, but they must be less than the allowable limits.
D.Nicks, scratches, chafing, scores	Maximum depth 0.005 in. (0.13 mm).	If the damage is less than the allowable limits, repair the tube at next 750 Flight Hours / 750 Flight Cycles / 4 calendar months (whichever the earliest). If the damage is more than the allowable limits, replace the tube (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001). There is no limit to the number of nicks, scratches, chafing or scores allowed, but the damage must be less than the allowable limits.
E.Wrinkles in bends	Maximum depth must be less than 10 percent of the tube diameter.	If the damage is more than the allowable limits, replace the tube (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001).
2.Examine the oil system hose assembly, look for:
A.Cracks	None permitted	If cracks are found, replace the hose (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001).
B.Crimps	None permitted	Replace the hose (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001). PRE SB RA32079-8
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 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001). POST SB RA32079-8
D.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 one foot (305 mm) of hose.	If the damage is more than the allowable limits replace the hose (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001). END OF SB RA32079-8
E.Internal blockage	None permitted	If blockage is found remove the blockage or replace the hose (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001).
F.Leakage	None permitted	Replace the hose (Ref. AMM TASK 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001).
3.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 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001).
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 79-20-00-000-001) and (Ref. AMM TASK 79-20-00-400-001).
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 79-20-00-410-053-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 03:37:50 UTC