航空 发表于 2011-4-15 19:20:31

CFM Oil Scavenge Filter Bows Assembly

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航空 发表于 2011-4-15 19:20:48

February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1<BR>Oil Scavenge Filter Bows<BR>Assembly<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2<BR>Oil Scavenge Filter Bows Assembly<BR>Background<BR>• Numerous cases of Filter bowl found seized @ routine filter inspection<BR> Requires oil scavenge filter assembly replacement<BR>Root cause<BR>• Bowl / housing threads machining tolerances more tight on CFM56-3 design<BR>compared to CFM56-7B<BR>• CFM56-3 implemented on CFM56-7B design<BR> New configuration validated through successful component tests<BR>• CFM56-7B configuration more prone to O-ring expansion due to higher oil<BR>temperature<BR>Damaged area<BR>Damaged thread<BR>Damaged<BR>diameters<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3<BR>Final Fix<BR>• Bowl/housing thread machining tolerance like -3 design<BR>– Concentricity tolerance more tight<BR>– Interchangeability not affected<BR>• Molykote grease on bowl thread at vendor and engine prod. level<BR> Both changes<BR>– Implemented on production engine since Dec 2001<BR>– SB 79-0006 will be released in Feb 2002<BR>• New seal (O-ring) design<BR> Smaller Viton O’ring seal selected<BR>– Same tore diameter, and smaller inner diameter (less expansion)<BR> O-ring seal J221P238 replaces J221P239<BR> SB release expected in Feb 2002<BR> Also will be introduced in CFM56-3 IPC as alternate with current O-ring<BR>Oil Scavenge Filter Bows Assembly<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4<BR>Field Recommendation<BR>• Compliance with AMM procedure reduces damage risks<BR> Clean threads and mating diameter<BR> Install Filter Cartridge in the housing prior to bowl installation<BR> Apply grease on bowl threads only<BR> Hand tighten the bowl<BR> Apply symmetrical force to bowl at removal<BR>• Use anti-seize compound only (Molykote Paste CP2569, CP2104,<BR>CP2444)<BR> DO NOT use graphite grease<BR> Apply on bowl threads only (ref AMM 79-21-06/401)<BR>Oil Scavenge Filter Bows Assembly

979199501 发表于 2011-4-15 23:57:43

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Arm
Proposed Switch Configuration
Current Double Throw
Proposed Single Throw
Run contact eliminated
Introduction Logistics
• CFMI/Boeing/Honeywell laun

kinran 发表于 2011-6-4 23:19:18

:victory: :victory:

bocome 发表于 2011-7-31 04:51:28

CFM Oil Scavenge Filter Bows Assembly
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