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 72-00-00
 ALL  ú ú C02 Page 213 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
b) Remove the obstruction or replace the tube. 4) Cuts in the fire sleeve in areas A and B:
 NOTE:____Area A is defined as follows: L = 2.5 x hose OD at the two ends of the hose. Area B is defined as the length between the two areas A.
 a)  Up to 3 cuts that do not cross per hose section are permitted if the length is not more than 0.20 inch
 (5.1 mm). b) If the cuts are more than the limit, replace the hose.
 5)  Tears in the fire sleeve material in area A:
 a) Not serviceable.
 b) Replace the hose.

 6)  Tears in the fire sleeve material in area B:
 a)  One per hose section is permitted if the depth is not more than 0.010 inch (0.25 mm) and the total area is not more than 0.40 square inch (258 square mm).
 b)  Replace the hose.
 (g)  Tube mechanical joint (ferrules) for: 1) Wear on the end face: a) Any amount is permitted if the O-ring retention flange is not deformed. 2) Nicks, dents and scratches on the end face:
 a)  Any amount is permitted if the O-ring retention flange is not deformed after you remove the high metal.
 S 912-023-C00
 (2)  If it is necessary, replace the damaged tube as follows:
 WARNING: DO NOT PERMIT THE FUEL TO TOUCH YOUR SKIN OR CLOTHES.
_______ REMOVE YOUR CLOTHES IF FUEL TOUCHES THEM. RINSE THE AREA OF THE YOUR SKIN THAT TOUCHED FUEL. FUEL CAN BURN YOU. INURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (a)  Disassemble the connection.
 NOTE: Tubes can have oil or fuel in them as they are removed.
____
 Drain the fuel into a container.

 (b)  
Install protective covers and caps on all drilled passages, fuel lines, oil lines, air lines and open engine ports when the parts are removed.

 (c)  
Give protection to all machined surfaces to prevent damage.

 (d)  
Remove and discard the O-rings, if it is necessary.

 (e)  
Remove and do an inspection of the gaskets or seals, if it is necessary (AMM 70-30-01/201).

 (f)  
Do an inspection of the mating and threaded surfaces for cleanliness, contamination, scratches, dents or other surface defects.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 72-00-00
 ALL  ú ú C02 Page 214 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(g)  
Do an inspection of the tube for satisfactory general condition and make sure that no damage has occurred.

 (h)  
Remove the protective covers and caps before you install the tube again.

 (i)  
Lubricate the new O-rings with lubricant, VV-P-236.

 (j)  
Apply a thin layer of oil, CFMI SB 79-001, to the gaskets and seals.

 (k)  
Install the new O-rings or serviceable gaskets as necesssary.

 (l)  
Install the tube but do not use force.

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

 (m)  
Tighten all the end fittings and all clamps with your hand.

 1)  After a system is installed, tighten the clamps first, then tighten the end fittings.

 (n)  
Do no chafe the tubes when you install the clamps.

 1)  Attach the tube loosely with a clamp and orient the tube to get the best clearance and tighten the clamps.

 (o)  
Use the correct size of clamps for the tube you install.

 (p)  
Make sure there is clearance between the tube and each adjacent part.

 NOTE: Use the correct minimum clearances given below:
____
 1)  Between the tube and this equipment:
 a) Structure (frames, bolts, rivets, webs, etc.):
　
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