(b) Seating surfaces of the fitting for: 1) Scratches in the circumference areas A and C: a) Any amount to 0.005 inch (0.13 mm) is permitted after you remove the high metal. b) Remove the high metal. 2) Scratches in circumference area B: a) Any amount not found when you use a 0.040 inch (1.02 mm) radius ball scribe. b) Remove the high metal. 3) Axial scratches in areas A and C: a) Any amount not more than 0.005 inch (0.13 mm) is permitted after you remove the high metal. b) Remove the high metal.
4) Axial scratches in area B:
a) Not serviceable.
b) Replace the tube.
5) Nicks and pits in area C: a) Any amount not more than 0.03 inch (0.8 mm) in depth is permitted after blending. b) Blend the depressions.
6) Nicks and pits in areas A and B:
a) Not serviceable.
b) Replace the tube.
7) Score marks in the circumference of silver plated seating (mating) surfaces: a) Any amount is permitted if the score mark does not go
through the parent metal. b) If the damage goes through, replace the tube.
8) Deformation in the circumference (spreading) of the
tube/ferrule:
a) Any amount of deformation is permitted if the nut is
free to turn.
b) If the nut does not turn, replace the tube.
9) Deformation in the circumference (spreading) of the flare nut: a) Any amount of deformation is permitted if the nut is
free to turn.
b) If the nut does not turn, replace the tube.
10) Axial deformation (dishing) of the spherical seat fitting surfaces: a) Any amount is permitted if the depth does not change
and is less than 0.005 inch (0.13 mm) to the initial surface. b) If the damage is more than the limit, replace the tube.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(c)
Tube and hose fitting nuts for: 1) Damaged corners: a) Damaged corners are permitted only if you can apply the correct torque. b) If you can not apply the correct torque, replace the tube or hose. 2) Damaged threads: a) Total of one full thread or one continuous thread can be missing after chasing the thread. b) Chase the threads.
3) Lockwire hole torn out:
a) Serviceable if one hole is still there.
b) If one hole is not there, replace the tube of hose.
(d)
Swivel flange fittings for:
1) Nicks or scratches on seating surface (surface B):
a) Not serviceable.
b) Replace the tube.
2) Nicks or scratches on mating surfaces (areas A and C): a) Any nick or scratch not more than 0.020 inch (0.51 mm) deep is permitted if you remove the high metal. b) Remove the high metal.
3) Cracks:
a) Not serviceable.
b) Replace the tube.
4) Seating surfaces (surface B) out-of-flat:
a) The maximum permitted out-of-flat dimension is 0.006
inch (0.15 mm).
b) If the out-of-flat dimension is more than the above
limit, replace the tube.
5) Cracks that extend out from the bolt holes:
a) The cracks are permitted when not more than 2 bolt
holes are cracked.
b) If more than the above limit, replace the tube.
6) Weld joint cracks:
a) Not serviceable.
b) Replace the tube.
(e)
Tube and hose assemblies for:
1) Leakage:
a) Not serviceable.
b) Replace the tube or hose.
(f)
Hose assemblies for: 1) Broken hose braid:
a) Three broken wires per plait and no more than 6 broken wires per assembly or per 1.0 linear foot (305 mm) of hose is permitted.
b) If more than the above limit, replace the hose.
2) Crimps:
a) Not serviceable.
b) Replace the hose.
3) Internal obstructions: 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 ENGINE 发动机 1(11)
