Engine Tubes, Hoses, and Fittings [CFMB]

TASK 72-00-00-917-002-A
Engine Tubes, Hoses, and Fittings

1. Reason for the Job
This section gives the general inspection and removal/installation instructions for engine 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	AR	CAP - PROTECTION
No specific	AR	CLOSURE
No specific	2	CONTAINER 10 L(2 1/2 USGAL)

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. Referenced Information

REFERENCE	DESIGNATION
TASK 70-21-00-918-002-A	Seals (Preformed Packings and O-rings) and Gaskets
TASK 71-00-00-710-006-B	Minimum Idle Check
TASK 73-11-30-200-002-A	Inspection/Check of the Fuel Manifold Assembly
Tube and Hose Seating Surfaces
Swivel Flanged Connectors
Hose Assembly Inspection Areas

3. Job Set-up
Subtask 72-00-00-869-076-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 72-00-00-210-073-A ** ON A/C NOT FOR ALL

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 73-11-30-200-002).

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Tubing for:
A.Splits, cracks or kinks	Not serviceable	Replace tube.
B.Dents or flat areas	Any amount when the contour is not more than 20 percent of original tube OD	Replace tube.
C.Nicks or scores on drain lines, drain shrouds, and scavenge lines, does not include aft sump oil scavenge line	Max. depth not more than 0.010 in. (0.25 mm) after blending	Blend the nicks or scores.
D.Nicks or scores on all other fuel, air and oil lines and aft sump oil scavenge line	Max. depth not more than 0.005 in. (0.13 mm) after blending	Blend the nicks or scores.
2.Seating surfaces of the fitting for: Tube and Hose Seating Surfaces ** ON A/C NOT FOR ALL
A.Scratches in circumference areas A and C	Any amount, up to 0.005 in. (0.13 mm) after removal of high metal	Remove high metal.
B.Scratches in circumference area B	Any amount not detectable using a 0.040 in. (1.02 mm) radius ball scribe	Remove high metal.
C.Axial scratches in areas A and C	Any amount, up to 0.005 in. (0.13 mm) after removal of high metal	Remove high metal.
D.Axial scratches in area B	Not serviceable	Replace tube.
E.Nicks and pits in area C	Any amount, not more than 0.03 in. (0.8 mm) deep after blending	Blend depressions.
F.Nicks and pits in areas A and B	Not serviceable	Replace tube.
G.Score marks in circumference of silver plated seating (mating) surfaces	Any amount when score mark does not go through parent metal	Replace tube.
H.Deformation in circumference (spreading) of tube/ferrule	Any amount when nut is free to turn	Replace tube.
J.Deformation in circumference (spreading) of flare nut	Any amount when nut is free to turn	Replace tube.
K.Axial deformation (dishing) of spherical seat fitting surface	Any amount if depth is constant and less than 0.005 (0.13 mm) to the initial surface	Replace tube.
3.Tube and hose fitting nuts for:
A.Damaged corners	Any amount when the correct torque can be applied	Replace tube or hose.
B.Damaged thread	Total of one full thread or one continuous thread may be missing after chasing threads	Chase threads.
C.Lockwire hole torn out	Serviceable if one hole is still there	Replace tube or hose.
4.Swivel flange fittings for: Swivel Flanged Connectors ** ON A/C NOT FOR ALL
A.Nicks or scratches on seating surface (surface B)	Not serviceable	Replace tube.
B.Nicks or scratches on mating surfaces (surfaces A and C)	Any nick or scratch, not more than 0.020 in. (0.51 mm) deep after removal of high metal	Remove high metal.
C.Cracks	Not serviceable	Replace tube.
D.Seating surface (surface B) out-of-flat	0.006 in. (0.15 mm) out-of-flat	Replace tube.
E.Cracks that extend out from bolt holes	Permitted when not more than 2 bolt holes are cracked	Replace tube.
F.Weld joint cracks	Not serviceable	Replace tube.
5.Tube and hose assembly for:
A.Leakage	Not serviceable	Replace tube or hose.
6.Hose assemblies for: Hose Assembly Inspection Areas ** ON A/C NOT FOR ALL NOTE: For hose assemblies, two distinct configurations are used and have different serviceable and repairable limits: Configuration 1: Reddish colored material made of RTV 577 (post SB 72-045). Configuration 2: Brownish colored material made of Silicone
A.Broken hose braid	Configuration 1: Not Serviceable	Replace hose.
	Configuration 2: 3 broken wires per plait and no more than 6 broken wires per assembly or per lineal foot (0.3 m) of hose	Replace hose.
B.Crimps	Configurations 1 and 2: Not serviceable	Replace hose.
C.Internal obstructions	Configurations 1 and 2: Not serviceable	Remove obstruction or replace hose.
D.Configuration 1: Cuts in fire sleeve areas A and B	Up to 3 cuts that do not cross per hose section if the length is not more than 0.20 in. (5.1 mm)	Replace hose. NOTE: Area A is defined as follows: L = 2.5 times the hose outer diameter at both ends of the hose. Area B is the length between the two Areas A
E.Tears in fire sleeve material area A	Configuration 1: Not serviceable	Replace hose.
F.Tears in fire sleeve material area B	Configuration 1: 1 per hose section if the depth is not more than 0.010 in. (0.25 mm) and total area is not more than 0.40 sq.in. (10.2 sq.mm)	Replace hose.
G.Transparent protective sleeve: Sleeve slipping or sleeve loss	Any amount
7.Tube mechanical joints (ferrules) for:
A.Wear on end face	Any amount when O-ring retention flange is not deformed.
B.Nicks, dents and scratches on end face	Any amount when O-ring retention flange is not deformed after removal of high metal.

Subtask 72-00-00-917-052-A ** ON A/C NOT FOR ALL

B. If necessary, replace the damaged tube as follows:

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.

(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 70-21-00-918-002).
(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 closures and caps 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. A small elastic distortion is permitted to engage the connections.
(13) Tightening method:

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(a) Tighten all end fittings and clamps with your hands. After a system is installed, torque the clamps first, then torque the end fittings.
(14) Do not chafe tubes when you install the clamps. Attach the tube loosely with a clamp and position the tube to get the best clearance, then tighten the clamps.
(15) Use the correct size clamps for the tube you install.
(16) Make sure there is clearance between the tube and each adjacent part. Correct minimum clearances are given in the table that follows:

AFFECTED EQUIPMENT	MINIMUM CLEARANCE	REMARKS
STRUCTURE: Frames, bolts, rivets, webs, etc.	0.25 in. (6.4 mm)	Not less than 0.06 in. (1.5 mm) clearance in 1 in. (25.4 mm) or less of clamping points
MECHANISM: Actuators, linkages, etc.	0.5 in. (12.7 mm)	Keep the clearance during the full travel of the mechanism
GROUPED TUBING: Parallel runs, intersections, etc.	0.19 in. (4.8 mm)	Clamp lines that go across each other to get minimum clearance of 0.12 in. (3.0 mm)

(17) Coupling nuts must turn freely by hand.
(18) The mating surfaces of the flanges of the tube must be installed at 90 degrees to each other.
(19) Make sure that fasteners are installed correctly when tightened to the specified value.
(20) Safety the connection with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

Subtask 72-00-00-917-053-A ** ON A/C NOT FOR ALL

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-rings, if necessary.
(4) Remove and do an inspection of the gaskets or seals, if necessary (Ref. AMM TASK 70-21-00-918-002).
(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 protective closures and caps 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 TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

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

Subtask 72-00-00-710-051-A ** ON A/C NOT FOR ALL

D. If fuel or oil lines were disconnected, do a minimum idle leak check and check for leaks (Ref. AMM TASK 71-00-00-710-006).

[Rev.10 from 2021] 2026.04.01 02:40:24 UTC