Inspection of Engine Tubes, Hoses and Fittings [CFML]

TASK 72-00-00-200-815-A
Inspection of Engine Tubes, Hoses and Fittings

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
This section gives the general inspection and removal/installation instructions engine for tubes, hoses and fittings.

NOTE: Assemblies covered by this task do not contain parts that have a regular replacement or inspection schedule.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - PROTECTION
No specific	AR	CLOSURE
No specific	2	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil
(Material No.CP5070)	vaseline
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-26-00-910-804-A	Seals (Preformed Packings and O-rings) and Gaskets
TASK 71-00-00-710-815-A	Idle Leak Check
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-21-35-200-801-A	Inspection/Check of the Fuel Manifold
TASK 73-29-00-740-803-A	Idle Test (Menu Mode)
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Spherical Seat Fittings and Tube Ferrule Fittings
Swivel Flange Fitting
Solid Flange Fitting

3. Job Set-up
Subtask 72-00-00-941-246-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 72-00-00-010-330-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 72-00-00-040-160-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-00-00-010-331-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure

WARNING: DO NOT LET ENGINE OIL STAY ON YOUR SKIN FOR A LONG TIME. FLUSH THE OIL FROM YOUR SKIN WITH WATER. THE OIL IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY.

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

Subtask 72-00-00-210-180-A

A. If a tube, hose, or fitting on the engine has apparent damage, do the inspection that follows:

NOTE: The limits in this table are general and they do not replace the limits on components given in this manual.

NOTE: The inspection of the fuel manifold is given in (Ref. AMM TASK 73-21-35-200-801).

NOTE: Examine the tubes, hoses, manifolds and fittings after you remove the high metal.

(1) Tubes and manifolds are classified in four categories based on the pressure they are subjected to, and which functional area they serve. Make sure tubing and manifolds agree with the limits for the category in which they are classified as given below:
Category A - Fuel, sensor and hydraulic lines
Category B - Air lines
Category C - Oil supply and scavenge lines
Category D - Drain lines and fuel protective shrouds

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine Category A, B, C, D tubes and manifolds packing groove flanges for: Spherical Seat Fittings and Tube Ferrule Fittings
A.Nicks, dents and scratches:	Any amount 0.002 in. (0.05 mm) in depth, if not in the preformed packing groove.	Replace tube or manifold.
2.Examine Category A, B, C, D hoses, tubes and manifolds fittings for:
A.Damaged corners:	Any amount, if you can torque the nut to the correct torque.	Replace tube, manifold or hose.
B.Damaged threads:	Any amount, if damaged thread is not decreased by more than one after chasing.	Replace tube, manifold or hose.
C.Safety wire and hole deformation and wear:	Serviceable, if metal around the hole is not cracked or torn.	- Use an unused hole. - Drill a new hole on an undrilled corner. Or replace tube, manifold or hose.
3.Examine Category A, B, C, D hoses, tubes and manifolds swivel flange fittings for: Swivel Flange Fitting
A.Nicks and scratches on seating Surface B:	Not serviceable.	Replace tube, manifold or hose.
B.Nicks and scratches on seating Surface A:	Any amount, if not more than 0.02 in. (0.51 mm) in depth.	Replace tube, manifold or hose.
C.Cracks	Not serviceable.	Replace tube, manifold or hose.
D.Sealing Surface A out-of flat:	0.035 in. (0.89 mm) out-of-flat.	Replace tube, manifold or hose.
E.Sealing Surface B out-of-flat:	0.005 in. (0.13 mm) out-of-flat.	Replace tube, manifold or hose.
F.Wear around the bolthole/bolthead interface:	Any amount, if the depth is not more than 10 percent of the nominal retaining flange thickness or not more than 0.02 in. (0.51 mm) whichever is less in the area of the bolt.	Replace tube, manifold or hose.
G.Flange bolthole scoring:	Any amount, 0.100 in. (2.54 mm) in length and 0.030 in. (0.76 mm) in depth, internal bore any amount as long as there is no hole elongation.	Replace tube, manifold or hose.
4.Examine Category A, B, C, D hoses, tubes and manifolds solid flange fittings for: Solid Flange Fitting
A.Nicks and scratches on the seating surface:	- Nicks and scratches less than 0.125 in. (3.17 mm) from the ID are not permitted. - Nicks 0.25 in. (6.35 mm) in length and 0.025 in. (0.63 mm) in depth are permitted if not less than 0.125 in. (3.17 mm) away from the ID. - Scratches 0.005 in. (0.13 mm) in depth are permitted, if not less than 0.125 in. (3.17 mm) from the ID.	Replace tube, manifold or hose.
B.Cracks	Not serviceable.	Replace tube, manifold or hose.
C.Seating surface out-of-flat:	0.005 in. (0.13 mm) out-of-flat.	Replace tube, manifold or hose.
D.Wear around the bolthole/bolthead interface:	Any amount, if the depth is not more than 10 percent of the nominal flange thickness or not more than 0.020 in. (0.51 mm); whichever is less in the area of the bolt.	Replace tube, manifold or hose.
5.Examine Category A, B, C, D hoses, tubes and manifolds fitting seating surface for: Spherical Seat Fittings and Tube Ferrule Fittings
A.Circumferential and axial scratches in Area C:	Any amount, if not more than 0.005 in. (0.13 mm) in depth.	Replace tube, manifold or hose.
B.Circumferential scratches in Area A and Area B:	Any amount, if you cannot feel the scratch with a 0.40 in. (10.16 mm) radius ball scriber.	Replace tube, manifold or hose.
C.Axial scratches in Area A and Area B:	Not serviceable.	Replace tube, manifold or hose.
D.Nicks and pits in Area C:	Any amount not more than 0.03 in. (0.76 mm) in depth.	Replace tube, manifold or hose.
E.Nicks and pits in Area A and Area B:	Not serviceable.	Replace tube, manifold or hose.
6.Examine Category A, B, C, D hoses, tubes and manifolds brackets for:
A.Wear	10 percent of the thickness or 10 percent of the hole diameter.	Replace tube, manifold or hose Or replace the bracket.
B.Cracks or separation:	Not serviceable.	Replace tube, manifold or hose Or replace the bracket.
7.Examine the flexible joints and bellows (flexible ducts) for:
A.Tears and cracks of the external surfaces of the flexible duct in the rubber:	Any amount with no tears or cracks fully through the material.	Replace the flexible duct.
B.Fabric that you can see (caused by wear of the rubber surface):	Any amount if the total surface area is not more than 0.2 in.2 (129.03 mm2)	Replace the flexible duct.
C.Wear, marks and tears on the inside of the flexible duct:	Any amount, if not more than 25 percent of the rubber thickness. No amount of blockage of flowpath air is permitted.	Replace the flexible duct.
8.Examine the Category A tubes and manifolds for:
A.Splits, cracks or kinks	Not serviceable	Replace the flexible duct.
B.Wrinkles in bends:	Not more than 2 percent of nominal tube or manifold diameter in depth. Wrinkles more than 0.040 in. (1.02 mm) in depth are not permitted. Two for each linear 12.0 in. (304.80 mm), if he depth is not more than 10 percent of the tube or manifold OD and the radius is not less than 2 times the wall thickness. Not more than 2 times the tube or manifold OD in length and contour change not more than 10 percent of the tube or manifold OD.	Replace tube or manifold.
C.Dents in straight sections and bends:	Maximum depth not more than 0.005 in. (0.13 mm)	Replace tube or manifold.
D.Flat areas:	Any amount, if you can torque nut to correct torque.	Replace tube or manifold.
E.Nicks, scratches or wear in straight sections and bends:	0.005 in. (0.13 mm) in depth.	Replace tube or manifold.
F.Nicks and scratches on the B-nut fitting wrenching flats and corners:	Any amount, if you can torque nut to correct torque.	Replace tube or manifold.
9.Examine the Category B tubes and manifolds for:
A.Splits, cracks, and kinks:	Not serviceable.	Replace tube or manifold.
B.Wrinkles in bends:	Not more than 2 percent of nominal tube or manifold diameter in depth. Wrinkles more than 0.040 in. (1.02 mm) in depth are not permitted.	Replace tube or manifold.
C.Dents:	Four for each linear 12.0 in. (304.80 mm), not less than 0.25 in. (6.35 mm) apart edge-to-edge, if the depth of each dent is not more than 10 percent of the tube or manifold OD and the radius is not less than 2 times the wall thickness.	Replace tube or manifold.
D.Flat areas:	Not more than 2 times the tube or manifold OD in length and contour change not more than 10 percent of the tube or manifold OD.	Replace tube or manifold.
E.Nicks, scratches or chafing in straight sections and bends:	0.005 in. (0.13 mm) in depth.	Replace tube or manifold.
F.Surface distress, peeling and missing material:	Not permitted in areas 0.25 in. (6.35 mm) or less from clamp areas. For all areas more than 0.25 in. (6.35 mm) from clamp areas: 0.025 in. (0.63 mm) maximum depth 1.25 in. (31.75 mm) diameter maximum defect area 0.5 in. (12.70 mm) minimum distance between defects Not more than 5 defects permitted.	Replace tube or manifold.
G.Wear on nickel brazed or welded sleeves or pads:	Depth of wear must not be more than 50 percent of the thickness of the sleeve or pad.	Replace tube or manifold.
H.Nicks and scratches on the B-nut fitting wrenching flats and corners:	Any amount, if you can torque nut to correct torque.	Replace tube or manifold.
J.Nicks, scratches and gouges on the clamp mating surface.	Any amount not more than 0.005 in. (0.13 mm) in depth.	Replace tube or manifold.
10.Examine the Category C tubes and manifolds for:
A.Splits, cracks and kinks:	Not serviceable.	Replace tube or manifold.
B.Wrinkles in bends:	Not more than 10 percent of nominal tube or manifold diameter in depth.	Replace tube or manifold.
C.Dents:	Six for each linear 12.0 in. (304.80 mm), not less than 0.25 in. (6.35 mm) apart edge-to-edge, if the depth of each dent is not more than 20 percent of the tube or manifold OD and the radius is not less than two times the wall thickness.	Replace tube or manifold.
D.Flat areas:	Not more than three times the tube or manifold OD in length and contour change is not more than 20 percent of the tube or manifold OD.	Replace tube or manifold.
E.Nicks, scratches or chafing, in straight sections and bends:	0.005 in. (0.13 mm) in depth.	Replace tube or manifold.
F.Nicks and scratches on the B-nut fitting wrenching flats and corners:	Any amount, if you can torque nut to correct torque.	Replace tube or manifold.
11.Examine the Category D tubes and manifolds for:
A.Splits, cracks and kinks:	Not serviceable	Replace tube or manifold.
B.Wrinkles in bends:	Not more than 15 percent of the nominal tube or manifold diameter in depth.	Replace tube or manifold.
C.Dents:	Six for each linear 12.0 in. (304.80 mm), not less than 0.25 in. (6.35 mm) apart edge-to-edge, if the depth of each dent is not more than 30 percent of the tube or manifold OD, and the radius is not less than two times the wall thickness, and dents in shrouds do not touch the inner tube or manifold.	Replace tube or manifold.
D.Flat areas:	Not more than three times the tube or manifold OD in length and contour change is not more than 20 percent of the tube or manifold OD	Replace tube or manifold.
E.Nicks, scratches, chafing or scores in straight sections or bends:	0.005 in. (0.13 mm) in depth.	Replace tube or manifold.
F.Nicks and scratches on the B-nut fitting wrenching flats and corners:	Any amount, if you can torque nut to correct torque.	Replace tube or manifold.
12.Examine the ACC Inlet Duct for:
A.Cracks:	Not serviceable.	Replace the duct.
B.Nicks and scratches:	0.005 in. (0.13 mm) in depth, in an area not more than 2.0 in.2 (1290.32 mm2). Indications must not penetrate into the carbon fabric. Fraying or loose fiber are not permitted.	Replace the duct.
C.Dents and gouges:	Not serviceable.	Replace the duct.
13.Examine the hose assemblies for:
A.Internal blockage:	Not serviceable.	Remove the blockage
B.Cuts, tears and chafing on the fire sleeve:	Any amount, if there is no damage to the braid under the fire sleeve and each defect in the fire sleeve is 0.50 in.2 (322.58 mm2) or less. Defects cannot overlap	Replace the fire sleeve.
C.Leakage:	Not serviceable.	Replace the hose.
D.Loose and missing tie down strap on the fire sleeve:	Not serviceable.	Repair the fire sleeve
E.Nicks and scratches on the B-nut fitting wrenching flats and corners:	Any amount, if you can torque nut to correct torque.	Replace the hose.

Subtask 72-00-00-917-054-A

B. If necessary, replace the damaged tube as follows:
(1) Disassemble the connection.

NOTE: Tubes can have oil or fuel in them as they are removed. Drain the fluid into a CONTAINER 10 L(2 1/2 USGAL).

(2) Install CLOSURE and CAP - PROTECTION on drilled passages, fuel lines, oil lines, air lines and open engine ports when parts are removed.
(3) Use protection on the machined surfaces to prevent damage.
(4) Remove and discard O-ring, if necessary.
(5) Remove and do an inspection of the gaskets or seals, if necessary (Ref. AMM TASK 70-26-00-910-804) .
(6) Do an inspection of the mating and threaded surfaces for cleanliness, contamination, scratches, dents or other surface defects.
(7) Do an inspection of the tube for satisfactory general condition and make sure that no damage has occurred.
(8) Remove the CLOSURE and CAP - PROTECTION used for protection immediately before installation.
(9) Lubricate new O-rings with vaseline (Material No.CP5070) .
(10) Apply a thin layer of engine oil (Material No.CP2442) to the gaskets and seals.
(11) Install new O-rings or serviceable gaskets or seals, as necessary.
(12) Install the tube but do not use force.

NOTE: A small elastic distortion is permitted to engage the connections.

(13) Tightening method:

CAUTION: USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.

Affected Equipement	Minimum Clearance	Remarks
STRUCTURE:	0.25 in. (6.35 mm)	Not less than 0.06 in. (1.52 mm) clearance in 1.0 in. (25.40 mm) or less of clamping points.
MECHANISM: Actuators, linkages, etc.	0.5 in. (12.70 mm)	Keep the clearance during the full travel of the mechanism.
GROUPED TUBING: Parallel runs, intersections, etc.	0.19 in. (4.83 mm)	Clamp lines that go across each other to get minimum clearance of 0.12 in. (3.05 mm)

(c) Torque the end fittings.
1 Coupling nuts must turn freely by hand.
2 The mating surfaces of the flanges of the tube must be installed at 90 degrees to each other.
3 Make sure that fasteners are installed correctly when tightened to the specified value.
(d) Safety the connection with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

Subtask 72-00-00-917-055-A

C. If necessary, replace the damaged hose as follows:
(1) Disassemble the connection.

NOTE: Hoses can have oil or fuel in them as they are removed. Drain the fluid into a CONTAINER 10 L(2 1/2 USGAL).

(2) Install CLOSURE and CAP - PROTECTION on drilled passages, fuel lines, oil lines, air lines and open engine ports when parts are removed.
(3) Remove and discard O-ring, if necessary.
(4) Remove and do an inspection of the gaskets or seals, if necessary (Ref. AMM TASK 70-26-00-910-804).
(5) Do an inspection of the mating and threaded surfaces for cleanliness, contamination, scratches, dents or other surface defects.
(6) Do an inspection of the hose for satisfactory general condition and make sure that no damage has occurred.
(7) Remove the CLOSURE and CAP - PROTECTION used for protection immediately before installation.
(8) Lubricate new O-rings with vaseline (Material No.CP5070) .
(9) Apply a thin layer of engine oil (Material No.CP2442) to the gaskets and seals.
(10) Install new O-rings or serviceable gaskets or seals, as necessary.
(11) Do not bend or try to make the preformed hoses straight.
(12) Tightening method:

CAUTION: USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.

(a) Tighten all end fittings and clamps with your hands.
1 After a system is installed, torque the clamps first, then torque the end fittings.
(b) Torque the clamps.
1 Do not chafe tubes when you install the clamps.
2 Attach the tube loosely with a clamp and position the hose to get the best clearance, then tighten the clamps.
3 Use the correct size clamps for the hose you install.
a A clamp that is too large will cause chafing.
b A clamp that is too small will cause a restriction.
4 Make sure there is clearance between the tube and each adjacent part.
(c) Torque the end fittings.
1 Coupling nuts must turn freely by hand.
2 The mating surfaces of the flanges of the tube must be installed at 90 degrees to each other.
3 Make sure that fasteners are installed correctly when tightened to the specified value.
(d) Safety the connection with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

Subtask 72-00-00-710-071-A

D. If fuel or oil lines were disconnected, do an idle check for leaks (Ref. AMM TASK 71-00-00-710-815).

Subtask 72-00-00-710-072-A

E. If PSS air line connections were disconnected, do a menu mode engine idle test (Ref. AMM TASK 73-29-00-740-803).

5. Close-up
Subtask 72-00-00-410-287-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 72-00-00-440-152-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-00-00-410-288-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:03:44 UTC